CN104865176A - Seepage experiment system and method for gas-containing coal under action of impact load - Google Patents
Seepage experiment system and method for gas-containing coal under action of impact load Download PDFInfo
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Abstract
The invention discloses a seepage experiment system for gas-containing coal under the action of an impact load. The system comprises a coal sample fixing device, an impact load applying device as well as a high-pressure gas source device, an axial pressure loading device, a confining pressure loading device, a vacuumizing device and a metering and data acquisition device connected with the coal sample fixing device, wherein the impact load applying device is a split Hopkinson pressure bar device. The split Hopkinson pressure bar device is adopted to apply the impact load for simulating rock burst, three-dimensional loaded conditions of coal-rock masses in coal mine can be simulated by applying different axial stresses and radial stresses, and seepage experiment of a coal sample in a three-dimensional stress state under the action of the impact load is successfully carried out, so that the system has relatively important meaning in both theory and practice.
Description
Technical field
The present invention relates to a kind of experimental system for the coal containing methane gas seepage characteristic under different axial compression, different confined pressure, different impact action condition and method, for simulating the seepage characteristic of coal containing methane gas under impact loading issuing raw coal rock dynamic disaster condition with Study on Coal mine.
Background technology
Rock burst is also known as rock burst, refer to that the coal and rock be in around colliery roadway or coal face under large ground pressure is subject to overlying strata and is caving or blast disturbance destroys, and in destructive process, be subject to the further crushing failure at high speed effect of country rock, thus the elastic deformation energy instantaneous relase produced goes out huge energy and produces the mining dynamic phenomena of destruction, the mechanical property in coal seam can produce great variety in the process, even causes the coal rock dynamic disasters such as coal and gas prominent.
Coal seam is except being subject to the many factors such as coal-bed gas pressure, terrestrial stress, coal body physico-mechanical properties, surrounding rock structure, underground water and ground temperature, also be subject to the impact of the shock load that mechanical vibration in process of coal mining, explosion, earthquake and rock burst produce to a great extent, thus make the seepage characteristic generation change in various degree of coal body, affect the normal stoping operation of underground coal mine.Similar experiment system in the past does not also carry out experimental study to the change that coal containing methane gas is applying seepage characteristic before and after shock load.
Summary of the invention
The object of the invention is to overcome prior art defect, provides coal containing methane gas seepage flow experiment system and method under a kind of impact loading.
For achieving the above object, the present invention adopts following technical scheme:
Coal containing methane gas seepage flow experiment system under a kind of impact loading, it comprises coal sample stationary installation, shock load charger and the high-pressure air source device be connected with coal sample stationary installation, axial compression charger, confined pressure charger, vacuum extractor and metering and data collector; Described shock load charger is split hopkinson press bar device; Described high-pressure air source device is made up of the high pressure gas tank connected in turn, reduction valve, the first valve, the first rain glass and T-valve, and the other two ends of T-valve connect the gas access of vacuum extractor and coal sample stationary installation respectively by pipeline; Described axial compression charger is made up of the axial compression oil pump connected in turn, the first pressure-regulating valve, the second valve and the first hydralic pressure gauge, and described first hydralic pressure gauge is connected with the axial compression pouring orifice of coal sample stationary installation by pipeline; Described confined pressure charger is made up of the confined pressure oil pump connected in turn, the second pressure-regulating valve, the 3rd valve and the second hydralic pressure gauge, and described second hydralic pressure gauge is connected with the confined pressure pouring orifice of coal sample stationary installation by pipeline; Described metering is made up of the data acquisition system (DAS) be connected in turn, gas volume flow gauge, the 4th valve and the second rain glass with data collector, and described second rain glass is connected with the gas vent of coal sample stationary installation.
Concrete, described coal sample stationary installation is made up of coal sampling mill and the axial compression cylinder body be fixed on above coal sampling mill; The axial load bar of band pressure transducer is provided with in described axial compression cylinder body, one end projecting shaft cylinder pressure of axial load bar is external and be in same level with split hopkinson press bar device, the other end stretches in coal sampling mill, the middle part of axial load bar is provided with the seal pad perpendicular with axial load bar, seal pad two ends be connected by the inner wall sealing of O-ring seal with axial compression cylinder body; Be provided with displacement transducer above described axial compression cylinder body, the sidewall of axial compression cylinder body is provided with two axial compression pouring orifices, two axial compression pouring orifices lay respectively at seal pad upper and lower, the sidewall of axial compression cylinder body also offers gas access; Described coal sampling mill comprises and is positioned at detachable pressure-bearing baffle plate bottom coal sampling mill and is positioned at the seal rubber sleeve that coal sampling mill inside is provided with hollow coal sample die cavity, seal rubber sleeve lateral wall offers groove and this groove and coal sampling mill madial wall form annular confined pressure oil pocket, the hollow coal sample die cavity that coal sample is placed in seal rubber sleeve is interior and isolated with annular confined pressure oil pocket, and the below of seal rubber sleeve arranges sealing gasket; The top of coal sample die cavity is provided with the first porous plate, the bottom of coal sample die cavity is provided with the second porous plate, the gas access of axial compression cylinder body is connected with first porous plate at coal sample die cavity top by the gas piping of axial load bar inside, and the end stretching into the axial load bar of coal sampling mill crimps with the first porous plate; Coal sampling mill sidewall is provided with confined pressure pouring orifice and gas vent, and the gas vent of coal sampling mill is connected with the second porous plate of coal sample cavity bottom by the gas piping of pressure-bearing baffle interior.Concrete, described vacuum extractor is made up of the vacuum pump connected in turn and the 5th valve.
Use said system to carry out the method for coal containing methane gas Seepage Experiment under impact loading, it comprises the steps:
1) experimental system is connected, and the impermeability of checking test;
2) Preparatory work of experiment: coal sample is put into the process of drying box freeze-day with constant temperature, for subsequent use after taking-up, cooling;
3) fixing coal sample: ready coal sample is loaded coal sample stationary installation;
4) vacuum outgas:, impermeability correct in the connection of the system of guarantee is good, opens vacuum extractor and Fruit storage is carried out to coal sample;
5) provide triaxiality environment: after Fruit storage completes, predetermined axial compression and confined pressure are applied to coal sample;
6) impact flow event: the methane gas being filled with predetermined pressure in coal sample, unlatching metering simultaneously and data collector, after stable, utilize split hopkinson press bar device to apply shock load to coal sample stationary installation, the also image data of metering simultaneously;
7) Data Processing in Experiment: utilize and intend coal containing methane gas percolation permeability size in platen press assessment experimentation, formula is specific as follows:
（1）
In formula:
k gfor gas permeability;
q 0for the volumetric flow of gas under the status of criterion;
with
be respectively average gas kinetic viscosity and mean compression factor (i.e. deviation factors);
lfor Porous Media length;
afor porous medium cross-sectional area;
p 0for the gaseous tension under the status of criterion;
p ifor the gas access end pressure of coal sample stationary installation;
p efor the gas vent end pressure of coal sample stationary installation;
tfor experimental situation absolute temperature;
t 0for absolute temperature under the status of criterion;
8) by change confined pressure in experimentation, axial compression, gas pressure and shock load the condition such as size, impact velocity can draw coal containing methane gas seepage characteristic under different experimental conditions and rule thereof.
The present invention overcomes the deficiency of current existing experimental technique means, coal containing methane gas seepage flow experiment system and method under a kind of impact loading are provided, by applying different axial stresses and radial stress, the three-dimensional loaded condition of underground coal mine coal and rock can be simulated, simultaneously by applying shock load, realize the experimental study of the seepage characteristic of coal containing methane gas under impact loading.In experimental system of the present invention, coal sample stationary installation is used for fixing and sealing coal sample, makes it to be in suitable experimental situation; High-pressure air source device is for providing the methane gas of different pressures; Shock load charger (i.e. split hopkinson press bar device) is for providing shock load; Axial compression charger is for providing the axle pressure of different size; Confined pressure charger is used for applying predetermined confined pressure to coal sample; Vacuum extractor is used for vacuumizing coal sample, the interference that in eliminating experimentation, foreign gas etc. may cause experimental result; Metering and data collector measure and Real-Time Monitoring for data such as the flows to the stress in experimentation, displacement, gas pressure and methane gas.
Confined pressure and axle pressure are applied simultaneously to coal sample, simulated experiment can be carried out to the change of the seepage characteristic after applying shock load of coal containing methane gas under different axial compression and different confined pressure condition, be mainly used in the change of coal containing methane gas porosity and the seepage characteristic of methane gas in coal under the action condition of modeling effort down-hole rock burst, for coal-mine gas diaster prevention and control provides experimental study means.This experimental system adopts split hopkinson press bar device to apply shock load simulation rock burst to coal containing methane gas sample, realize the simulation of the permeability behavior of coal containing methane gas under impact loading, simultaneously by data real-time collection and continual collection device, accurately can observe the Change and Development trend of coal containing methane gas sample permeability
Experimental system of the present invention had both considered the triaxiality stand under load environment of coal containing methane gas, have also contemplated that the variation relation applying coal containing methane gas Penetration Signature before and after shock load simultaneously, experimental data and result accurately can be obtained under various combination experiment condition by the acquisition and processing of data.The seepage characteristic Changing Pattern of coal containing methane gas under impact loading can not only be studied by coal containing methane gas seepage flow experiment system under impact loading of the present invention, the research of the changes such as crack under impact loading of coal under different triaxiality environment and hole can also be used for.Experimental system of the present invention have rational in infrastructure, easy and simple to handle, measure the advantages such as accurate, practical.The present invention has enriched the experimental study techniques and methods of impact loading action condition coal containing methane gas sample seepage characteristic.
Accompanying drawing explanation
Fig. 1 is the structural representation of coal containing methane gas seepage flow experiment system of the present invention,
In figure, 1 is coal sample stationary installation; 2 is high pressure gas tank; 3 is reduction valve; 4 is the 5th valve; 5 is the first pressure-regulating valve; 6 is the second pressure-regulating valve; 7 is the first valve; 8 is the second valve; 9 is the 3rd valve; 10 is the 4th valve; 11 is the first rain glass; 12 is the first hydralic pressure gauge; 13 is the second hydralic pressure gauge; 14 is the second rain glass; 15 is T-valve; 16 is vacuum pump; 17 is axial compression oil pump; 18 is confined pressure oil pump; 19 is gas volume flow gauge; 20 is data acquisition system (DAS); 21 is split hopkinson press bar device;
Fig. 2 is the structural representation that the coal sample stationary installation dextrorotation in Fig. 1 turn 90 degrees,
In figure, 1-1 is axial load bar; 1-2. is pressure transducer; 1-3 is displacement transducer; 1-4 is axial compression cylinder body; 1-5 is O-ring seal; 1-6 is gas access; 1-7 is seal pad; 1-8 is the first porous plate; 1-9 is seal rubber sleeve; 1-10 is experiment coal sample; 1-11 is the second porous plate; 1-12 is gas vent; 1-13 is sealing gasket; 1-14 is pressure-bearing baffle plate; 1-15 is axial compression pouring orifice; 1-16 is coal sampling mill; 1-17 is confined pressure pouring orifice.
Embodiment
Do to introduce in detail further to technical scheme of the present invention below in conjunction with embodiment, but protection scope of the present invention is not limited thereto.
embodiment 1
As illustrated in fig. 1 and 2, coal containing methane gas seepage flow experiment system under a kind of impact loading, it comprises coal sample stationary installation 1, shock load charger and the high-pressure air source device be connected with coal sample stationary installation 1, axial compression charger, confined pressure charger, vacuum extractor and metering and data collector; Described shock load charger is split hopkinson press bar device 21; Described high-pressure air source device is made up of the high pressure gas tank 2 connected in turn, reduction valve 3, first valve 7, first rain glass 11 and T-valve 15, and the other two ends of T-valve 15 connect the gas access 1-6 of vacuum extractor and coal sample stationary installation 1 respectively by pipeline; Described axial compression charger is made up of axial compression oil pump 17, first pressure-regulating valve 5, second valve 8 connected in turn and the first hydralic pressure gauge 12, and described first hydralic pressure gauge 12 is connected with the axial compression pouring orifice 1-15 of coal sample stationary installation 1 by pipeline; Described confined pressure charger is made up of confined pressure oil pump 18, second pressure-regulating valve 6 connected in turn, the 3rd valve 9 and the second hydralic pressure gauge 13, and described second hydralic pressure gauge 13 is connected with the confined pressure pouring orifice 1-17 of coal sample stationary installation 1 by pipeline; Described metering is made up of the data acquisition system (DAS) 20 be connected in turn, gas volume flow gauge 19, the 4th valve 10 and the second rain glass 14 with data collector, and described second rain glass 14 is connected with the gas vent 1-12 of coal sample stationary installation 1.
Described coal sample stationary installation 1 is made up of coal sampling mill 1-16 and the axial compression cylinder body 1-4 be secured by bolts in above coal sampling mill 1-16; The axial load bar 1-1 of band pressure transducer 1-2 is provided with in described axial compression cylinder body 1-4, one end projecting shaft cylinder pressure body 1-4 of axial load bar 1-1 is outer and be in same level with split hopkinson press bar device 21, the other end stretches in coal sampling mill 1-16, the middle part of axial load bar 1-1 is provided with the seal pad 1-7 perpendicular with axial load bar 1-1, and the two ends of seal pad 1-7 are connected with the inner wall sealing of axial compression cylinder body 1-4 by O-ring seal 1-5; Displacement transducer 1-3 is provided with above described axial compression cylinder body 1-4, the sidewall of axial compression cylinder body 1-4 is provided with two axial compression pouring orifice 1-15, two axial compression pouring orifice 1-15 lay respectively at the upper and lower of seal pad 1-7, and the sidewall of axial compression cylinder body 1-4 also offers gas access 1-6.
Described coal sampling mill 1-16 comprises and is positioned at detachable pressure-bearing baffle plate 1-14 bottom coal sampling mill 1-16 and is positioned at the seal rubber sleeve 1-9 that coal sampling mill 1-16 inside is provided with hollow coal sample die cavity, seal rubber sleeve 1-9 lateral wall offers groove and this groove and coal sampling mill madial wall form annular confined pressure oil pocket, the hollow coal sample die cavity that coal sample 1-10 is placed in seal rubber sleeve 1-9 is interior and isolated with annular confined pressure oil pocket, and the below of seal rubber sleeve 1-9 arranges sealing gasket 1-13; The top of coal sample die cavity is provided with the first porous plate 1-8, the bottom of coal sample die cavity is provided with the second porous plate 1-11, the gas access 1-6 of axial compression cylinder body 1-4 is connected with the first porous plate 1-8 at coal sample die cavity top by the gas piping of axial load bar inside, and the end stretching into the axial load bar 1-1 of coal sampling mill 1-16 crimps with the first porous plate 1-8; Coal sampling mill 1-16 sidewall offers confined pressure pouring orifice 1-17 and gas vent 1-12, and the gas vent 1-12 of coal sampling mill 1-16 is connected with the second porous plate 1-11 of coal sample cavity bottom by the gas piping of pressure-bearing baffle interior.Described vacuum extractor is made up of the vacuum pump 16 connected in turn and the 5th valve 4.
In pilot system of the present invention, the gas in high pressure gas tank 2 enters into coal sample stationary installation 1 and provides gas source of the gas for testing after decompress(ion).Hopkinson pressure bar in split hopkinson press bar device 21 provides shock load to simulate rock burst, acts on the axial direction of coal containing methane gas sample.Axial compression charger is in order to provide constant axial condition to coal sample.Confined pressure charger is in order to provide constant radial pressure condition to coal sample.The triaxiality environment that coal sample stationary installation 1 can provide is the key point of this device, and its effect is placed and fixing coal sample, provides experiment required ambient stress simultaneously, both can realize applying confined pressure to coal sample, can realize again applying axial compression to coal sample.Vacuum extractor is used for carrying out vacuum pumping to coal sample, and despumation gas etc. are on testing the impact that may cause.Metering and data collector in gas volume flow gauge 19 for measuring the methane gas uninterrupted of seepage flow.Metering and data collector are used for monitoring the data variation of whole experimentation and gathering.
Experimental system provided by the invention can realize following major experimental function:
(1) coal containing methane gas Seepage Experiment under different three-dimensional stress constraint;
(2) coal containing methane gas Seepage Experiment under impact loading;
(3) coal containing methane gas Experiments of Machanics under impact loading.
Use said system to carry out the method for coal containing methane gas Seepage Experiment under impact loading, it comprises the steps:
1) experimental system is connected, and the air-leakage test of checking test; Be specially: close the 5th valve 4, first valve 7, the 4th valve 10, T-valve 15 is connected high-pressure air source device and coal sample stationary installation 1.Open the second valve 8, the 3rd valve 9, apply a less axial compression and confined pressure (size is identical) to experimental system, prevent in gas replenishment process, seal rubber sleeve and cylinder body exist space to be caused leaking gas.Then the first valve 7 is opened, regulate reduction valve 3, the reading of now the first rain glass 11, second rain glass 14 and the first hydralic pressure gauge 12, second hydralic pressure gauge 13 is recorded be filled with the methane gas of certain pressure in pipeline after, close the first valve 7 simultaneously and place 24 hours, whether the reading observing each table changes.If pressure gauge reading unanimously and do not decline, shows that system impermeability is good, otherwise debugs, until system impermeability is good.
2) Preparatory work of experiment: get a ready experiment coal sample 1-10(size at Φ about 50 × 50mm), put into the process of drying box freeze-day with constant temperature, to eliminate the impact that moisture causes experimental result.Take out, record of coal sample being measured and weighed after cooling.
3) fixing coal sample: screw off the pressure-bearing baffle plate 1-14 in coal sample stationary installation 1 and sealing gasket 1-13, ready experiment coal sample 1-10 is put into seal rubber sleeve 1-9, then installs coal sample stationary installation 1.
4) vacuum outgas: connect correct in guarantee system, when impermeability is good, opens vacuum extractor and Fruit storage is carried out to coal sample, to get rid of the impact that in coal sample and system, other gas may cause experimental result.Be specially: close the first valve 7, the 4th valve 10, T-valve 15 is connected vacuum extractor and coal sample stationary installation 1.Open the second valve 8, the 3rd valve 9, apply a less axial compression and confined pressure (size is identical) to experimental system, prevent in vacuum, seal rubber sleeve and cylinder body exist space to be caused leaking gas.Then the 5th valve 4 and vacuum pump 16 is opened, vacuum pumping is carried out to whole experimental system, until when experimental system inside meets the requirements of negative pressure (being less than 50Pa), closes the 5th valve 4, T-valve 15 is connected high-pressure air source device and coal sample stationary installation 1, then close vacuum pump 16.After closing vacuum pump 16, experimental system vacuum tightness kept stable in 3 hours always, namely completed vacuum outgas.
5) triaxiality environment is provided: after Fruit storage completes, open the second valve 8 and the 3rd valve 9, regulate the first pressure-regulating valve 5 and the second pressure-regulating valve 6, utilize axial compression oil pump 17, confined pressure oil pump 18 to apply predetermined axial compression and confined pressure by axial compression pouring orifice 1-15 and confined pressure pouring orifice 1-17 to coal sample, load rear closedown second valve 8 and the 3rd valve 9.
6) impact flow event: the methane gas being filled with predetermined pressure in coal sample, unlatching metering simultaneously and data collector, after stable, utilize split hopkinson press bar device 21 pairs of coal sample stationary installations to apply shock loads, the also image data of metering simultaneously;
Open the first valve 7, regulate reduction valve 3 in experiment coal sample 1-10, be filled with the methane gas of predetermined pressure, open the 4th valve 10 simultaneously and measure and image data.Split hopkinson press bar device 21 pairs of coal sample stationary installations are utilized to apply shock load (namely using Hopkinson pressure bar impact groove to load bar 1-1) after stable, the axial displacement simultaneously utilizing pressure transducer 1-2 and displacement transducer 1-3 to record surge pressure now and coal sample to occur, metering image data.
7) Data Processing in Experiment: utilize and intend coal containing methane gas percolation permeability size in platen press assessment experimentation, formula is specific as follows:
（1）
In formula:
k gfor gas permeability;
q 0for the volumetric flow of gas under the status of criterion;
with
be respectively average gas kinetic viscosity and mean compression factor (i.e. deviation factors);
lfor Porous Media length;
afor porous medium cross-sectional area;
p 0for the gaseous tension under the status of criterion;
p ifor the gas access end pressure of coal sample stationary installation;
p efor the gas vent end pressure of coal sample stationary installation;
tfor experimental situation absolute temperature;
t 0for absolute temperature under the status of criterion;
8) by change confined pressure in experimentation, axial compression, gas pressure and shock load the condition such as size, impact velocity can draw coal containing methane gas seepage characteristic under different experimental conditions and rule thereof.
Claims (4)
1. coal containing methane gas seepage flow experiment system under an impact loading, it is characterized in that, comprise coal sample stationary installation, shock load charger and the high-pressure air source device be connected with coal sample stationary installation, axial compression charger, confined pressure charger, vacuum extractor and metering and data collector; Described shock load charger is split hopkinson press bar device; Described high-pressure air source device is made up of the high pressure gas tank connected in turn, reduction valve, the first valve, the first rain glass and T-valve, and the other two ends of T-valve connect the gas access of vacuum extractor and coal sample stationary installation respectively by pipeline; Described axial compression charger is made up of the axial compression oil pump connected in turn, the first pressure-regulating valve, the second valve and the first hydralic pressure gauge, and described first hydralic pressure gauge is connected with the axial compression pouring orifice of coal sample stationary installation by pipeline; Described confined pressure charger is made up of the confined pressure oil pump connected in turn, the second pressure-regulating valve, the 3rd valve and the second hydralic pressure gauge, and described second hydralic pressure gauge is connected with the confined pressure pouring orifice of coal sample stationary installation by pipeline; Described metering is made up of the data acquisition system (DAS) be connected in turn, gas volume flow gauge, the 4th valve and the second rain glass with data collector, and described second rain glass is connected with the gas vent of coal sample stationary installation.
2. coal containing methane gas seepage flow experiment system under impact loading as claimed in claim 1, it is characterized in that, described coal sample stationary installation is made up of coal sampling mill and the axial compression cylinder body be fixed on above coal sampling mill; The axial load bar of band pressure transducer is provided with in described axial compression cylinder body, one end projecting shaft cylinder pressure of axial load bar is external and be in same level with split hopkinson press bar device, the other end stretches in coal sampling mill, the middle part of axial load bar is provided with the seal pad perpendicular with axial load bar, seal pad two ends be connected by the inner wall sealing of O-ring seal with axial compression cylinder body; Be provided with displacement transducer above described axial compression cylinder body, the sidewall of axial compression cylinder body is provided with two axial compression pouring orifices, two axial compression pouring orifices lay respectively at seal pad upper and lower, the sidewall of axial compression cylinder body also offers gas access; Described coal sampling mill comprises and is positioned at detachable pressure-bearing baffle plate bottom coal sampling mill and is positioned at the seal rubber sleeve that coal sampling mill inside is provided with hollow coal sample die cavity, seal rubber sleeve lateral wall offers groove and this groove and coal sampling mill madial wall form annular confined pressure oil pocket, the hollow coal sample die cavity that coal sample is placed in seal rubber sleeve is interior and isolated with annular confined pressure oil pocket, and the below of seal rubber sleeve arranges sealing gasket; The top of coal sample die cavity is provided with the first porous plate, the bottom of coal sample die cavity is provided with the second porous plate, the gas access of axial compression cylinder body is connected with first porous plate at coal sample die cavity top by the gas piping of axial load bar inside, and the end stretching into the axial load bar of coal sampling mill crimps with the first porous plate; Coal sampling mill sidewall is provided with confined pressure pouring orifice and gas vent, and the gas vent of coal sampling mill is connected with the second porous plate of coal sample cavity bottom by the gas piping of pressure-bearing baffle interior.
3. coal containing methane gas seepage flow experiment system under impact loading as claimed in claim 1, it is characterized in that, described vacuum extractor is made up of the vacuum pump connected in turn and the 5th valve.
4. use system described in claim 1 to carry out the method for coal containing methane gas Seepage Experiment under impact loading, it is characterized in that, comprise the steps:
1) experimental system is connected, and the impermeability of checking test;
2) Preparatory work of experiment: coal sample is put into the process of drying box freeze-day with constant temperature, for subsequent use after taking-up, cooling;
3) fixing coal sample: ready coal sample is loaded coal sample stationary installation;
4) vacuum outgas:, impermeability correct in the connection of the system of guarantee is good, opens vacuum extractor and Fruit storage is carried out to coal sample;
5) provide triaxiality environment: after Fruit storage completes, predetermined axial compression and confined pressure are applied to coal sample;
6) impact flow event: the methane gas being filled with predetermined pressure in coal sample, unlatching metering simultaneously and data collector, after stable, utilize split hopkinson press bar device to apply shock load to coal sample stationary installation, the also image data of metering simultaneously;
7) Data Processing in Experiment: utilize and intend coal containing methane gas percolation permeability size in platen press assessment experimentation, formula is specific as follows:
（1）
In formula:
k gfor gas permeability;
q 0for the volumetric flow of gas under the status of criterion;
with
be respectively average gas kinetic viscosity and mean compression factor;
lfor Porous Media length;
afor porous medium cross-sectional area;
p 0for the gaseous tension under the status of criterion;
p ifor the gas access end pressure of coal sample stationary installation;
p efor the gas vent end pressure of coal sample stationary installation;
tfor experimental situation absolute temperature;
t 0for absolute temperature under the status of criterion;
8) by changing confined pressure in experimentation, axial compression, the size of gas pressure and shock load, impact velocity can draw coal containing methane gas seepage characteristic under different experimental conditions and rule thereof.
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