CN104614298B - Constant-volume gas-bearing coal gas-solid coupling physical and mechanical parameter testing device and testing method - Google Patents
Constant-volume gas-bearing coal gas-solid coupling physical and mechanical parameter testing device and testing method Download PDFInfo
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Abstract
The invention discloses a constant-volume gas-bearing coal gas-solid coupling physical and mechanical parameter testing device and a testing method. The testing device comprises a visualized loading system for quantitatively inflating a test piece, triaxially loading and unloading and visually monitoring the whole process in real time, a constant volume system for realizing constant volume in an axial pressurizing process, and a normal-pressure visualized gas volume measurement system for quantitatively unloading the confining pressure and visually monitoring the adsorption and desorption process of the test piece. The testing device has the beneficial effects that an adsorption and desorption channel of the axis of a pressurized head can be used for measuring the adsorption and desorption mount of the test piece to gas, the constant volume system can realize the constant volume in the axial pressurizing process to eliminate the interference of pressure intensity change to the testing process, the normal-pressure visualized gas volume measurement system adopts the theory of communicating vessels and a quantitative drainage method to transform colourless and invisible gas to a normal pressure state, therefore, the visualized observation and real-time data acquisition can be realized during testing.
Description
Technical field
The invention belongs to Mineral Engineering, Geotechnical Engineering scientific research technical field, more particularly to disclose different loads for research
With the adsorption-desorption rule of coal seam with gas under the conditions of gas pressure, different load phase coal seam with gas infiltration Changing Patterns and
Damage the experimental rig and test method of dilatation failure mechanism.
Background technology
Gas accident harm is huge, and particularly coal and gas prominent becomes the great difficulty of puzzlement China's coal-mine safety in production
Topic, but damage dilatation destruction and the gas fast desorption of coal containing methane gas are diffused and cause the study mechanism of coal and gas prominent also not
It is clear.According to the comprehensive function hypothesis of coal and gas prominent：Coal and gas prominent is by the physics of crustal stress, gas pressure and coal
The result of mechanical property comprehensive function.But the physico-mechanical properties of crustal stress, gas pressure and coal is in coal and gas prominent mistake
Mechanism of action in journey, not yet studies at present clear.
The coal and gas prominent case for actually occurring in a large number and the achievement in research of many scholars show coal and gas prominent
The essence of process is crustal stress destruction coal body, coal body quick release gas, coal body is most destroyed at last and is dished out the process in tunnel.At present
Numerous studies have been carried out in terms of coal mass strength of the scholars to coal containing methane gas under different gas pressures.
Gas pressure is one of the key factor for affecting coal and gas prominent, see clearly in coal body destructive process gas pressure and
The Changing Pattern of adsorption-desorption characteristics is significant for announcement Gas Outburst genesis mechanism and pre- prominent protrusion-dispelling.For this purpose, compeling
Being essential will develop a kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter test device systematic.
At present, for coal seam with gas adsorption-desorption, damage dilatation influence research, have carried out substantial amounts of research work
Make, have developed a series of simulation test devices, present Research is as follows：
(1) Chinese patent of Application No. 200910104608.8 is the invention discloses a kind of coal containing methane gas heat flow piercement
Three axle servo seepage apparatus, it includes elevator platform, hydraulic servo control system, axially loaded at the top of elevator platform
Device and the triaxial cell for being connected to axial loading device lower end, can carry out different crustal stress, different gas pressures, difference
Deformation-failure character research of the research of coal containing methane gas seepage tests and coal containing methane gas under the states such as temperature in flow event.
(2) Chinese patent of Application No. 201310137965.0 discloses chemistry under a kind of rock Single Fracture different temperatures
Fluid flow experimental rig, including specimen appliance system, axial pressure system, confined pressure system, chemical solution pressure loading system,
Servo-control system and data collecting system, the equipment is suitable to study when different temperatures chemical solution oozed rock Single Fracture to be occurred
Chemical attack-stress coupling effect.
(3)《Coal science and technology》" the coal containing methane gas that 7 phases of volume 37 in July, 2009 are delivered by Liu Jianzhong, Zhang Dongming etc.
Triaxial compression test dress is disclosed in Experimental Study on Seepage Characteristics under different confined pressures " (page 86～89) text in 1.2nd trifle
Put, the device is made up of loading system, measuring system and the part of gas feed system 3.Wherein loading system by Ag-250 and from
Three bearing shells of main research and development this osmotic system composition, measuring system is mainly gas flowmeter, and gas feed system is by high pressure gas
Tank, pressure-reducing valve and pressure gauge composition.Change confined pressure and the coal sample seepage characteristic under the conditions of gas pressure can be studied.
The model test stand device system of the above-mentioned unit of comprehensive analysis, has the following disadvantages：
1. above-mentioned experimental rig is no matter large or small, can not solve in loading procedure because the change of loading chamber volume causes test empty
Between gas pressure intensity change to test objective interference problem；
2. complex operation in above-mentioned experimental rig process of the test, single function, and major part are only capable of qualitatively observing destruction
Phenomenon is difficult to the visualization real-time monitoring of process of the test.
Adsorption-desorption rule and damage for coal seam with gas under the conditions of preferably studying different loads, different gas pressures
Dilatation failure mechanism, needs to develop a kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided one kind is capable of achieving research and discloses different lotuses
The test device systematic of the adsorption-desorption rule of coal seam with gas and damage dilatation failure mechanism under the conditions of load, different gas pressures
And test method.
For achieving the above object, the present invention adopts following technical proposals：
A kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig, including：For quantitatively filling to test specimen
The visualization loading system of the visualization real-time monitoring of gas, the pressurization release of three axles and whole process, for realizing axial pressure
The constant volume system of the constant volume of process and for realize to the quantitative unloading of confined pressure and test specimen adsorption-desorption process can
Normal pressure visualizing gas volume measuring system depending on changing monitoring；
The visualization loading system is connected respectively with constant volume system and normal pressure visualizing gas volume measuring system.
The visualization loading system includes：Top board, base plate, polishing head, compression chamber, interview filling groove and column；
The compression chamber is fixed between top board and base plate, is fixedly connected by column between the top board and base plate；Institute
State polishing head to be fixed on top board, compression chamber is goed deep in polishing head lower end, top board is stretched out in upper end, in the plate upper surface centre bit
Put and be respectively equipped with interview filling groove with polishing head lower end；The prefabricated adsorption-desorption passage of polishing head shaft core position.
Interview filling passage, discharge channel, constant volume passage are respectively equipped with the base plate and confined pressure passage is filled, it is described
Interview filling passage is provided with pressure sensor for test pressure is monitored and controlled with filling in confined pressure passage；The interview filling is logical
Road external gas source, inside are connected for the quantitative inflation of coal petrography with interview filling groove；The external normal pressure visualizing gas of discharge channel
Volume measuring system, Nei Jie compression chambers are used for quantitative unloading confined pressure；The external constant volume system of constant volume passage, Nei Jie compression chambers are used for perseverance
Hold pressurization, filling confined pressure passage external gas source, Nei Jie compression chambers is used to quantitatively fill confined pressure.
The constant volume system includes：Constant volume room, constant volume support, constant volume piston, linking arm and rubber tube；
The constant volume room is fixedly connected by linking arm with the polishing head upper end of visualization loading system, and constant volume support is fixed
On the top board of visualization loading system, the lower end of the constant volume piston is goed deep into constant volume room, upper end and is fixed on constant volume support, institute
State constant volume room bottom to connect with visualization loading system by rubber tube, described rubber tube one end connects another with constant volume room bottom
End and constant volume channel connection.
The indoor cross-sectional area of the constant volume room stretches into compression chamber inside portion with the polishing head lower end of visualization loading system
The cross-sectional area for dividing is identical.
The normal pressure visualizing gas volume measuring system includes：Water-injecting cavity, drain chamber, base and connecting tube；
The water-injecting cavity and drain chamber are fixed on base, and are connected by connecting tube；The water-injecting cavity bottom and draining
Top of chamber keeps level, two chambers to connect to form U-tube, and the drain chamber is connected by being bi-directionally connected valve with visualization loading system
Logical, the drain chamber is also connected by unidirectional connection valve with outside air.
A kind of test method of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig, the experimental provision energy
It is enough to carry out three class experiments respectively：
The first kind is the deformation-failure character test of rock coal body under constant volume, three axle loading environments；Equations of The Second Kind is different gas
Under pressure and content, the damage dilatation attribute testing of coal seam with gas；3rd class is the absorption of coal seam with gas under constant volume
Adsorption law probes into test；
The deformation-failure character test of the rock coal body specifically includes following steps：
1) test specimen is placed in compression chamber, test specimen two ends are fixed by rubber ring and are enclosed within the formula filling groove of face；
2) device assembling, and the device for assembling is put on servo-pressing machine；
3) fill confined pressure passage to connect with extraneous source of the gas；
4) every valve and passage are closed, compression chamber is vacuumized；
5) according to testing program, three axle loadings, unloading are carried out to test specimen, its axially loaded pressure value is by servo-pressing machine control
System, the pressure sensor control indoor by pressurization is placed in of confined pressure value, constant volume room pushes synchronization with polishing head in process of the test
Move down, constant volume piston is moved relative on constant volume room, pressurization indoor gas confined pressure enters constant volume room by rubber tube, realizes volume
It is constant；
6) deformation-failure character of the observed and recorded test specimen under the conditions of different on-load pressures.
The damage dilatation attribute testing of the coal seam with gas specifically includes following steps：
1) it is placed in coal sample side is closed in compression chamber, test specimen two ends are fixed by rubber ring and are enclosed within face formula filling groove
It is interior；
2) device assembling, and the device for assembling is put on servo-pressing machine；
3) interview fills passage and fills confined pressure passage and connects with extraneous source of the gas respectively, and adsorption-desorption passage is visualized with normal pressure
Gas volume measuring system connects；
4) every valve and passage are closed, compression chamber is vacuumized；
5) valve that is bi-directionally connected of normal pressure visualizing gas volume measuring system is closed, unidirectional connection valve is opened, to water-injecting cavity
Till water filling is until filling drain chamber, unidirectional connection valve is closed；
6) according to testing program, desired value is loaded into the axle of coal sample three；
7) after confined pressure and axial compressive force are stable, interview filling passage and normal pressure visualizing gas volume measuring system are opened
Be bi-directionally connected valve, interview inflation is carried out to coal sample；
8) the change rule of observed and recorded coal sample complete stress-strain process bulk strain under the conditions of different loads, gas pressure
The related laws such as rule, permeability, damage dilatation.
The adsorption-desorption rule of the coal seam with gas is probed into test and specifically includes following steps：
1) it is placed in coal sample side is closed in compression chamber, its test specimen two ends is fixed by rubber ring and is enclosed within face formula filling groove
It is interior；
2) device assembling, and the device for assembling is put on servo-pressing machine；
3) interview fills passage and fills confined pressure passage and connects with extraneous source of the gas respectively, and adsorption-desorption passage is visualized with normal pressure
Gas volume measuring system connects；
4) every valve and passage are closed, compression chamber is vacuumized；
5) valve that is bi-directionally connected of normal pressure visualizing gas volume measuring system is closed, unidirectional connection valve is opened, to water-injecting cavity
Till water filling is until filling drain chamber, unidirectional connection valve is closed；
6) according to testing program, desired value is loaded into the axle of coal sample three；
7) after confined pressure and axial compressive force are stable, interview filling passage and normal pressure visualizing gas volume measuring system are opened
Be bi-directionally connected valve；
8) interview filling known quantity methane gas are carried out to coal sample；
9) unabsorbed gases enter normal pressure visualizing gas volume measuring system by adsorption-desorption passage, treat that coal sample reaches
To after adsorption-desorption saturation state, the displacement of volume of drain chamber is recorded；
10) adsorption-desorption characteristics and rule of the observed and recorded coal sample under the conditions of different loads, gas pressure.
The invention has the beneficial effects as follows：
1. the visualization real-time monitoring work(of the quantitative inflation to test specimen, the pressurization release of three axles and whole process is capable of achieving
Energy.
2. interview filling passage and fill confined pressure passage and be contained within pressure sensor test pressure can be monitored and controlled.
3. the adsorption-desorption passage in polishing head axle center can be used to measure adsorption-desorption amount of the test specimen to gas, and constant volume system can
The constant volume of axial pressure process is realized to exclude interference of the pressure change to process of the test, normal pressure visualizing gas volume is surveyed
Colourless invisible gas is transformed into atmospheric pressure state by amount system using law of connected vessels and quantitative drainage, realizes that process of the test can
Obtain during depending on changing observation sum factually.
4. it is right to be capable of achieving when normal pressure visualizing gas volume measuring system is connected with the discharge channel of visualization loading system
The visualization of confined pressure is quantitatively unloaded, and is capable of achieving to solve test specimen absorption when the adsorption-desorption channel connection with visualization loading system
Inhale visualization Quantitative Monitoring and the research of characteristic.
Description of the drawings
Fig. 1 is constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig overall structure diagram of the present invention；
Fig. 2 is present invention visualization loading system profile；
Fig. 3 is present invention visualization loading system base arrangement schematic diagram；
Fig. 4 is the profile of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig of the present invention；
Fig. 5 (a) is constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig front view of the present invention；
Fig. 5 (b) is constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig side view of the present invention；
Fig. 5 (c) is constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig top view of the present invention；
Wherein, 1 visualization loading system, 1-1 top boards, 1-2 base plates, 1-3 polishing heads, 1-4 adsorption-desorption passages, 1-5 adds
Pressure chamber, 1-6 interview filling grooves, 1-7 columns, 1-8 interview filling passages, 1-9 discharge channels, 1-10 constant volume passages, 1-11 fills and encloses
Pressure passageway；
2 constant volume systems, 2-1 constant volumes room, 2-2 constant volume supports, 2-3 constant volume pistons, 2-4 linking arms, 2-5 rubber tubes；
3 normal pressure visualizing gas volume measuring systems, 3-1 water-injecting cavities, 3-2 drain chambers, 3-3 bases, 3-4 connecting tubes, 3-5
It is bi-directionally connected valve, the unidirectional connection valves of 3-6.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is further described.
As shown in Figure 1：A kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter test device systematic includes visualization
Loading system 1, constant volume system 2, normal pressure visualizing gas volume measuring system 3；Visualization loading system 1 is capable of achieving to test specimen
The visualization real-time monitoring function of quantitative inflation, the pressurization release of three axles and whole process；Constant volume system 2 is capable of achieving axial pressure
The constant volume of process changes interference to process of the test to exclude pressure；Normal pressure visualizing gas volume measuring system 3 is utilized
Law of connected vessels and quantitative drainage are capable of achieving the quantitative unloading to confined pressure and the visualizing monitor of test specimen adsorption-desorption process.
As shown in Figures 2 and 3：A kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter test device systematic it is visual
Change loading system 1, by top board 1-1, base plate 1-2, polishing head 1-3, compression chamber 1-5, interview filling groove 1-6 and column 1-7 is constituted,
The prefabricated interview filling passage 1-8 of the prefabricated adsorption-desorption passage 1-4 of its polishing head 1-3 shaft core positions, base plate 1-2, discharge channel 1-
9, constant volume passage 1-10 and confined pressure passage 1-11 is filled, top board 1-1 and the prefabricated cannelures of base plate 1-2 are easy to compression chamber 1-5 to inlay
And be fixedly connected by column 1-7.
Compression chamber 1-5 is located between top board 1-1 and base plate 1-2, and top, base plate are connected so as to pressurize by four root post 1-7
Room 1-5 links closely and fixes, and polishing head 1-3 is bolted at top board center, and polishing head 1-3 gos deep into compression chamber 1-5, upper end in lower end
Top board 1-1 is stretched out, base plate 1-2 upper surfaces center and polishing head 1-3 lower ends are respectively equipped with the interview filling groove of bolt fixation
1-6；
Interview filling passage 1-8, discharge channel 1-9, constant volume passage 1-10 are respectively equipped with base plate 1-2 and confined pressure is filled and are led to
Road 1-11, interview fills passage 1-8 and fills confined pressure passage 1-11 and is contained within pressure sensor for test pressure is monitored and controlled,
Its interview filling passage 1-6 external gas source, internal connection with interview filling groove 1-6 play a part of inflation quantitative to coal petrography, unload
The external normal pressure visualizing gas volume measuring systems 3 of pressure passageway 1-9, Nei Jie compression chambers 1-5 play a part of quantitatively to unload confined pressure,
The external constant volume systems of constant volume passage 1-10, Nei Jie compression chambers 1-5 play a part of constant volume pressurization, fill confined pressure passage 1-11 external gas
Source, Nei Jie compression chambers 1-5 play a part of quantitatively to fill confined pressure.
The adsorption-desorption passage 1-4 in polishing head axle center can be used to measure adsorption-desorption amount of the test specimen to gas, specific to survey
Amount method is controlled by external gas source and pressure sensor, and the gas of known quantity, test specimen top and absorption are filled to test specimen bottom surface
Desorption passage 1-4 connections, stable rear gas not to be adsorbed enters visualization discharging system and passes through by adsorption-desorption passage 1-4
Drainage records unadsorbed amount, and the difference between the two is test specimen stably rear adsorption-desorption amount.
As shown in Figure 2：A kind of constant volume system of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter test device systematic
2, by constant volume room 2-1, constant volume support 2-2, constant volume piston 2-3, linking arm 2-4 and rubber tube 2-5 composition, its constant volume room 2-1 leads to
Cross linking arm 2-4 to be fixedly connected with polishing head 1-3, constant volume support 2-2 is fixedly connected with top board 1-1, constant volume piston 2-3 is fixed on
Constant volume room is goed deep in constant volume support, the lower end (piston head) of constant volume piston 2-3, and upper end is bolted on constant volume support 2-2, rubber
Sebific duct 2-5 one end connects the other end and constant volume channel connection with constant volume room 2-1 bottoms；The indoor cross-sectional area of constant volume room 2-1 with
The cross-sectional area that pressure head 1-3 is stretched into inside compression chamber 1-5 lower end is identical.
Constant volume system 2 is capable of achieving the constant volume of axial pressure process to exclude interference of the pressure change to process of the test,
Concrete grammar is that compression chamber 1-5 is connected by constant volume passage with constant volume room 2-1, and polishing head 1-3 lower end diameters are equal to constant volume room 2-
1 internal diameter, constant volume room synchronous decline as polishing head is pushed, so as to realize the function of constant volume.
As shown in Figure 4：A kind of normal pressure of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter test device systematic is visual
Change gas volume measuring system 3, including water-injecting cavity 3-1, drain chamber 3-2, base 3-3, connecting tube 3-4, be bi-directionally connected valve 3-5,
Unidirectional connection valve 3-6, its water-injecting cavity 3-1 bottoms are with drain chamber 3-2 top holding level and two chambers are the amount of clear glass material
Cylinder, is bi-directionally connected valve 3-5 one end and connects the other end with adsorption-desorption passage 1-4 by rubber tube and connect with drain chamber 3-2, unidirectionally
Connection valve 3-6 one end connects the other end and air communication with drain chamber 3-2.
Water-injecting cavity 3-1 and drain chamber 3-2 are fixed on base 3-3, and are connected by connecting tube 3-4；Water-injecting cavity 3-1 bottoms
Keep level, two chambers to connect to form U-tube with drain chamber 3-2 top, be to ensure that exhaust is front-seat to produce extra pressure except water column is present
The strong interference to testing should ensure that water-injecting cavity bottom is concordant with drain chamber top holding, and two chamber sizes need not the identical but row of should ensure that
The water for being discharged to water-injecting cavity by drain chamber during gas does not spill over；Drain chamber 3-2 is connected by being bi-directionally connected valve with visualization loading system 1
Logical, drain chamber 3-2 is also connected by unidirectional connection valve 3-6 with outside air.
A kind of test method of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter test device systematic, can meet various
Test objective and design requirement, are substantially attributed to following three class：The first kind is the deformation of rock coal body under constant volume, three axle loading environments
Destructive characteristics are tested；Equations of The Second Kind is the damage dilatation attribute testing of coal seam with gas under different gas pressures and content；3rd class
Adsorption-desorption rule for coal seam with gas under constant volume probes into test.The test method of different tests scheme is distinguished below
Narration.
It is as follows that the deformation-failure character of rock coal body tests concrete test procedure：
1) test specimen is placed in compression chamber 1-5, its test specimen two ends is fixed in closed and face formula filling groove 1-6 by rubber ring；
2) device assembling, will top board 1-1 be connected with base plate 1-2 by column 1-7 make compression chamber 1-5 formation by roof and floor
The sealing system that 1-2 two ends are fixed, system is put on servo-pressing machine, and its base plate 1-2 is placed on servo loading platform, polishing head
1-3 is contacted with the jack pressure head of servo loading machine；
3) fill confined pressure passage 1-11 to connect with extraneous source of the gas；
4) every valve and passage are closed, compression chamber 1-5 is vacuumized；
5) according to testing program, three axle loadings, unloading are carried out to test specimen, its axially loaded pressure value is by servo-pressing machine control
System, (constant volume room is with polishing head 1-3 in process of the test by the pressure sensor control being placed in compression chamber 1-5 for confined pressure value
Pressure is synchronous to be moved down, and constant volume piston is moved relative on constant volume room, and gas confined pressure enters constant volume room by rubber tube in compression chamber 1-5,
Realize the purpose of constant volume)；
6) deformation-failure character of the observed and recorded test specimen under the conditions of different on-load pressures；
7) test is finished, and removes device, takes out test specimen.
The concrete test procedure of coal containing methane gas bulk damage dilatation attribute testing is as follows：
1) it is placed in coal sample side is closed in compression chamber 1-5, its test specimen two ends is fixed by rubber ring and closed filled with face formula
Fill out in groove 1-6；
2) device assembling, will top board 1-1 be connected to link closely with base plate 1-2 by column 1-7 and make compression chamber 1-5 formation by pushing up
The sealing system that base plate 1-2 two ends are fixed, system is put on servo-pressing machine, and its base plate 1-2 is placed on servo loading platform, plus
Pressure head 1-3 is contacted with the jack pressure head of servo loading machine；
3) interview filling passage 1-8 and fill confined pressure passage 1-11 and connect with extraneous source of the gas respectively, adsorption-desorption passage with it is normal
Pressure visualizing gas volume measuring system 3 connects；
4) every valve and passage are closed, compression chamber 1-5 is vacuumized；
5) valve that is bi-directionally connected of normal pressure visualizing gas volume measuring system 3 is closed, unidirectional connection valve 3-6 is opened, to note
Till water cavity water filling is until filling drain chamber, unidirectional connection valve 3-6 is closed.
6) according to testing program, desired value is loaded into the axle of coal sample three；
7) after confined pressure and axial compressive force are stable, interview filling passage 1-8 and normal pressure visualizing gas cubing are opened
System 3 is bi-directionally connected valve, to coal sample carries out interview inflation；
8) the change rule of observed and recorded coal sample complete stress-strain process bulk strain under the conditions of different loads, gas pressure
The related laws such as rule, permeability, damage dilatation；
9) test is finished, and removes device, takes out test specimen.
It is as follows that coal seam with gas adsorption-desorption rule probes into the concrete test procedure of test：
1) it is placed in coal sample side is closed in compression chamber 1-5, its test specimen two ends is fixed by rubber ring and closed filled with face formula
Fill out in groove 1-6；
2) device assembling, will top board 1-1 be connected to link closely with base plate 1-2 by column 1-7 and make compression chamber 1-5 formation by pushing up
The sealing system that base plate 1-2 two ends are fixed, system is put on servo-pressing machine, and its base plate 1-2 is placed on servo loading platform, plus
Pressure head 1-3 is contacted with the jack pressure head of servo loading machine；
3) interview filling passage 1-8 and fill confined pressure passage 1-11 and connect with extraneous source of the gas respectively, adsorption-desorption passage with it is normal
Pressure visualizing gas volume measuring system 3 connects；
4) every valve and passage are closed, compression chamber 1-5 is vacuumized；
5) valve that is bi-directionally connected of normal pressure visualizing gas volume measuring system 3 is closed, unidirectional connection valve 3-6 is opened, to note
Till water cavity water filling is until filling drain chamber, unidirectional connection valve 3-6 is closed.
6) according to testing program, desired value is loaded into the axle of coal sample three；
7) after confined pressure and axial compressive force are stable, interview filling passage 1-8 and normal pressure visualizing gas cubing are opened
System 3 is bi-directionally connected valve；
8) interview filling known quantity methane gas are carried out to coal sample；
9) unabsorbed gases enter normal pressure visualizing gas volume measuring system 3 by adsorption-desorption passage, treat coal sample
After reaching adsorption-desorption saturation state, the displacement of volume of drain chamber is recorded；
10) adsorption-desorption characteristics and rule of the observed and recorded coal sample under the conditions of different loads, gas pressure；
11) test is finished, and removes device, takes out test specimen.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (6)
1. a kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig, is characterized in that, including：For to test specimen
The visualization loading system of the visualization real-time monitoring of quantitative inflation, the pressurization release of three axles and whole process, for realizing axle
To the constant volume system of the constant volume of pressure process and for realizing the quantitative unloading to confined pressure and test specimen adsorption-desorption mistake
The normal pressure visualizing gas volume measuring system of the visualizing monitor of journey；
The visualization loading system is connected respectively with constant volume system and normal pressure visualizing gas volume measuring system；
The visualization loading system includes：Top board, base plate, polishing head, compression chamber, interview filling groove and column；
The compression chamber is fixed between top board and base plate, is fixedly connected by column between the top board and base plate；It is described to add
Pressure head is fixed on top board, and compression chamber is goed deep in polishing head lower end, and top board is stretched out in upper end, in the plate upper surface center and
Polishing head lower end is respectively equipped with interview filling groove；The prefabricated adsorption-desorption passage of polishing head shaft core position；
The constant volume system includes：Constant volume room, constant volume support, constant volume piston, linking arm and rubber tube；The constant volume room is by connecting
Connect arm to be fixedly connected with the polishing head upper end of visualization loading system, constant volume support is fixed on the top board of visualization loading system
On, the lower end of the constant volume piston is goed deep into constant volume room, upper end and is fixed on constant volume support, and constant volume room bottom passes through rubber tube
Connect with visualization loading system, described rubber tube one end connects the other end and constant volume channel connection with constant volume room bottom；
The normal pressure visualizing gas volume measuring system includes：Water-injecting cavity, drain chamber, base and connecting tube；
The water-injecting cavity and drain chamber are fixed on base, and are connected by connecting tube；The water-injecting cavity bottom and drain chamber top
Portion keeps level, two chambers to connect to form U-tube, and the drain chamber is connected by being bi-directionally connected valve with visualization loading system, institute
State drain chamber also to connect with outside air by unidirectional connection valve.
2. a kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig as claimed in claim 1, is characterized in that,
Interview filling passage, discharge channel, constant volume passage are respectively equipped with the base plate and confined pressure passage is filled, the interview filling
Passage is provided with pressure sensor for test pressure is monitored and controlled with filling in confined pressure passage；The interview filling passage external gas
Source, inside are connected for the quantitative inflation of coal petrography with interview filling groove；The external normal pressure visualizing gas cubing of discharge channel
System, Nei Jie compression chambers are used for quantitative unloading confined pressure；The external constant volume system of constant volume passage, Nei Jie compression chambers pressurize for constant volume,
Filling confined pressure passage external gas source, Nei Jie compression chambers is used to quantitatively fill confined pressure.
3. a kind of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig as claimed in claim 1, is characterized in that,
The indoor cross-sectional area of the constant volume room stretches into the transversal of pressurization chamber inner portion with the polishing head lower end of visualization loading system
Area is identical.
4. a kind of test side of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig as claimed in claim 1
Method, is characterized in that, the experimental rig can respectively carry out three class tests：
The first kind is the deformation-failure character test of rock coal body under constant volume, three axle loading environments；Equations of The Second Kind is different gas pressures
Under content, the damage dilatation attribute testing of coal seam with gas；3rd class is the adsorption-desorption of coal seam with gas under constant volume
Rule probes into test；
The deformation-failure character test of the rock coal body specifically includes following steps：
1) test specimen is placed in compression chamber, test specimen two ends are fixed by rubber ring and are enclosed within interview filling groove；
2) device assembling, and the device for assembling is put on servo-pressing machine；
3) fill confined pressure passage to connect with extraneous source of the gas；
4) every valve and passage are closed, compression chamber is vacuumized；
5) according to testing program, test specimen is carried out three axle loadings, unloading, its axially loaded pressure value by servo-pressing machine control,
The pressure sensor control indoor by pressurization is placed in of confined pressure value, constant volume room pushing under synchronization with polishing head in process of the test
Move, constant volume piston is moved relative on constant volume room, pressurization indoor gas confined pressure enters constant volume room by rubber tube, realizes the perseverance of volume
It is fixed；
6) deformation-failure character of the observed and recorded test specimen under the conditions of different on-load pressures.
5. a kind of test side of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig as claimed in claim 4
Method, is characterized in that, the damage dilatation attribute testing of the coal seam with gas specifically includes following steps：
1) it is placed in coal sample side is closed in compression chamber, test specimen two ends are fixed by rubber ring and are enclosed within interview filling groove；
2) device assembling, and the device for assembling is put on servo-pressing machine；
3) interview filling passage and fill confined pressure passage and connect with extraneous source of the gas respectively, adsorption-desorption passage and normal pressure visualizing gas
Volume measuring system connects；
4) every valve and passage are closed, compression chamber is vacuumized；
5) valve that is bi-directionally connected of normal pressure visualizing gas volume measuring system is closed, unidirectional connection valve is opened, to water-injecting cavity water filling
Till until filling drain chamber, unidirectional connection valve is closed；
6) according to testing program, desired value is loaded into the axle of coal sample three；
7) after confined pressure and axial compressive force are stable, the double of interview filling passage and normal pressure visualizing gas volume measuring system are opened
To connection valve, interview inflation is carried out to coal sample；
8) observed and recorded coal sample under the conditions of different loads, gas pressure the Changing Pattern of complete stress-strain process bulk strain,
Permeability and damage dilatation rule.
6. a kind of test side of constant volume coal containing methane gas Gas-solid Coupling physical and mechanical parameter experimental rig as claimed in claim 4
Method, is characterized in that, the adsorption-desorption rule of the coal seam with gas is probed into test and specifically includes following steps：
1) it is placed in coal sample side is closed in compression chamber, its test specimen two ends is fixed by rubber ring and is enclosed within interview filling groove；
2) device assembling, and the device for assembling is put on servo-pressing machine；
3) interview filling passage and fill confined pressure passage and connect with extraneous source of the gas respectively, adsorption-desorption passage and normal pressure visualizing gas
Volume measuring system connects；
4) every valve and passage are closed, compression chamber is vacuumized；
5) valve that is bi-directionally connected of normal pressure visualizing gas volume measuring system is closed, unidirectional connection valve is opened, to water-injecting cavity water filling
Till until filling drain chamber, unidirectional connection valve is closed；
6) according to testing program, desired value is loaded into the axle of coal sample three；
7) after confined pressure and axial compressive force are stable, the double of interview filling passage and normal pressure visualizing gas volume measuring system are opened
To connection valve；
8) interview filling known quantity methane gas are carried out to coal sample；
9) unabsorbed gases enter normal pressure visualizing gas volume measuring system by adsorption-desorption passage, treat that coal sample reaches suction
After attached desorption saturation state, the displacement of volume of drain chamber is recorded；
10) adsorption-desorption characteristics and rule of the observed and recorded coal sample under the conditions of different loads, gas pressure.
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| CN105021508B (en) * | 2015-07-14 | 2017-06-09 | 山东科技大学 | It is suitable to heat flow piercement coal body true triaxial shearing seepage experimental apparatus and its experimental technique of various mediums |
| CN105910974B (en) * | 2016-06-12 | 2018-10-02 | 河南理工大学 | A kind of experimental method and device of test coal seam with gas equipressure imbibition effect |
| CN106918531B (en) * | 2016-12-28 | 2021-04-13 | 山东大学 | Dynamic and static combined loading rock testing machine and testing method for multi-phase coupling |
| CN108827785B (en) * | 2018-05-03 | 2020-12-08 | 辽宁工程技术大学 | Constant-volume triaxial loading device for coal rock containing gas |
| CN108458950B (en) * | 2018-05-03 | 2021-02-12 | 辽宁工程技术大学 | Device and method for measuring gas adsorption/desorption amount in coal rock loading and cracking process |
| CN110082496B (en) * | 2019-05-24 | 2024-05-17 | 华北科技学院 | Triaxial coal sample model experiment system |
| CN112081575B (en) * | 2020-09-10 | 2022-09-13 | 西南石油大学 | Multi-field coupling coal bed gas well surrounding rock deformation visual simulation device and method |
| CN112763329B (en) * | 2020-12-16 | 2022-04-19 | 山东大学 | Gas-solid coupling coal rock triaxial mechanical damage real-time detection device, system and method |
| CN112858015A (en) * | 2020-12-28 | 2021-05-28 | 太原理工大学 | Test device and method for coal rock gas-solid coupling dynamic and static loading and unloading infrared observation |
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| CN101135622B (en) * | 2007-10-10 | 2010-10-06 | 中国科学院武汉岩土力学研究所 | Rock double linkage three axis rheogeniometer |
| CN101634621B (en) * | 2009-08-12 | 2011-05-25 | 重庆大学 | Fluid-solid-heat coupling triaxial servo percolation device for gas-contained coal |
| CN101629891B (en) * | 2009-08-12 | 2012-10-31 | 重庆大学 | Fixedly coupled three-shaft servo seepage pressure chamber containing gas coal thermal flow |
| CN101936857B (en) * | 2010-09-02 | 2011-10-26 | 中国科学院武汉岩土力学研究所 | Confining pressure keeping system of rock triaxial creep testing machine |
| CN102419295B (en) * | 2011-08-19 | 2013-05-01 | 中国矿业大学(北京) | Loaded coal rock constant pressure gas adsorption desorption testing system and method thereof |
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| CN104316448B (en) * | 2014-11-03 | 2017-08-01 | 中国石油大学(华东) | A kind of Forecasting Methodology of high-order coal petrography gas phase permeability dynamic change |
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