CN103454164B - Multi-scenarios method coal petrography impact loading experiment device and experimental technique - Google Patents
Multi-scenarios method coal petrography impact loading experiment device and experimental technique Download PDFInfo
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Abstract
A kind of multi-scenarios method state coal petrography impact experiment apparatus and experimental technique thereof.Described experimental provision comprises axial static pressure charger, axial static pressure loads hydraulic oil pump, axial static pressure petroleum pipeline, confined pressure load hydraulic oil pump, confined pressure loads petroleum pipeline, radial confined pressure charger, gas gas tank, gas inlet pipe, gas pressure variable valve, aspiration pump, firedamp sensor, gas escape pipe, cold, hot two-purpose compressor, servo oil pump, cold, hot two-purpose petroleum pipeline.This experimental provision and method can realize coal petrography sample and be in multi-scenarios method state, ensure that coal petrography sample is in axial static load, radial confined pressure static load, gas pressure, temperature couple state, thus can carry out experiment for the situation of dynamic load.
Description
Technical field
The invention belongs to coal petrography mechanical property testing technical field, more specifically, relating to a kind of for simulating static stress, temperature, gas adsorption multi-scenarios method state coal petrography impact loading experiment device and experimental technique.
Background technology
In the recovery process of underground coal resource, a large amount of use mechanization is combined and is adopted cutting coal machine and carry out fragmentation, goaf top plate cycle across to fall and near workplace, the work such as Blasting Excavation of rock gangway brings obvious dynamic impact problem disturbance to workplace coal and rock to coal petrography, cause deep coal rock gas dynamic disaster frequent, serious harm miner life security, for the mechanism of further investigation deep coal rock gas dynamic disaster, need the dynamic characteristics exploring coal petrography Shock Loading.These dynamic characteristics normally by experiment room carry out all kinds of impact experiment to obtain, current application comparatively extensively and also the reliable impact experiment system of results contrast be SHPB(splitHopkinsonpressurebar, split hopkinson press bar) device, and the various deformation devices improved thus.
Numerous scholar thinks that the coal rock gas dynamic disaster in the coal exploitation process of deep is by the coefficient result of physico mechanical characteristic of terrestrial stress, gas, ground temperature, exploitation disturbance, coal petrography.In traditional SHPB experiment, institute's test sample is often in room temperature and is exposed among air, experimentation specimen temperature is caused to change by experiment seasonal variations, compose in the gas exposure air deposited in coal petrography simultaneously and desorption of mash gas effect will occur, methane gas in coal petrography sample is caused to depart from, almost no longer containing methane gas in sample.But, China's coal seam major part is the coal seam containing the Permo-carboniferous period enriching gas (mainly methane CH4), along with the continuous increase of the coal resources back production degree of depth, coal and rock gas bearing capacity is also in increase trend, unmind coal body to be in and to be rich in gas state, can reach more than 10MPa in the gas pressure of deep under ground, in coal and rock, gas bearing capacity is far away higher than gas bearing capacity in traditional experiment sample; Simultaneously with the continuous increase of the exploitation of coal resources degree of depth, geotemperature increases with the speed of every 100 meters 3 degrees Celsius, for the coal resources of the back production 1 km degree of depth, the temperature of its coal petrography itself can reach 40 degrees Celsius, increase with mining depth also will be increased further, and under gas bearing and hot conditions effect, the mechanical characteristic of coal petrography and traditional experiment result have bigger difference.Therefore, develop corresponding multi-scenarios method coal petrography impact loading device, the crash characteristics carried out under static stress, gas bearing, temperature field multi-scenarios method condition has tested the work urgently carried out into current coal petrography mechanics field.
The existing analogue experiment installation to deep resources of mines exploitation process medium power Disaster Study, mainly can divide following several: (1) dynamic and static year stress coupling, as sound carries combination loading experimental apparatus, but such experimental provision, sample exposes in atmosphere, and under cannot carrying out simulation gas environment, coal and rock mechanical characteristic is tested; (2) gas-solid Environmental coupling, gas environment dynamics experimental device, such experimental provision, under static test-machine loading environment, carries out methane gas in the static semi-static load process of coal and rock, adsorption-desorption and seepage characteristic experiment.
But in the progress of coal mining of deep, coal and rock bears high-ground stress static load, the strong power disturbance of recovery process, High-geotemperature and the acting in conjunction of high methane pressure, its force modes is no longer independent static stress, dynamic loading, temperature or gas pressure effect, but multiple physical field coupling, this is that existing experimental provision and experimental technique could not be considered.Realize coal petrography multiple physical field coupled surge loading experiment, not only can make up existing coal petrography Experiments of Machanics method, and coal petrography characterisitic parameter more accurately can be provided for the dynamic disaster research of deepen coal resource back production engineering.
Summary of the invention
The present invention is according to coal petrography occurrence status feature in deepen coal resource exploitation process, the defect of stress coupling and Gas-solid Coupling could not be considered for existing coal petrography Experiments of Machanics method and apparatus, there is provided a kind of and can realize the multi-scenarios method condition of coal petrography sample at terrestrial stress, energetic disturbance, gas bearing, ground temperature, the multi-scenarios method impact loading experiment device more met with engineering reality and method.
For solving the problems of the technologies described above, according to one side, a kind of multi-scenarios method state impact experiment apparatus, comprise axial static pressure charger, axial static pressure loads hydraulic oil pump, axial static pressure petroleum pipeline, confined pressure loads hydraulic oil pump, confined pressure loads petroleum pipeline, radial confined pressure charger, gas gas tank, gas inlet pipe, gas pressure variable valve, aspiration pump, firedamp sensor, gas escape pipe, cold, hot two-purpose compressor, servo oil pump, cold, hot two-purpose petroleum pipeline, it is characterized in that: between the stress wave incident bar and transmission bar at the two ends of coal petrography sample, described axial static pressure charger is set, in axial static pressure charger middle sample position, described radial confined pressure charger is set, air admission hole and venthole are offered in incident bar at sample two ends and transmission bar center, be connected with gas inlet pipe and gas escape pipe respectively, gas inlet pipe is connected with gas gas tank by gas pressure variable valve, gas escape pipe is connected with aspiration pump by firedamp sensor, realizes experimentation sample and is in gas bearing environment, cold, hot two-purpose petroleum pipeline is set in confined pressure charger, is connected with cold, hot two-purpose compressor by servo oil pump, realize controlling sample experiment process temperature.
Described axial static pressure charger in experimental provision of the present invention loads hydraulic oil pump by axial static pressure petroleum pipeline and axial static pressure and is connected, and realizes loading the axial static pressure of sample; Described radial confined pressure charger loads hydraulic oil pump by confined pressure loading petroleum pipeline with confined pressure and is connected, and realizes loading the static confined pressure of the radial direction of sample.
Experimental provision of the present invention also comprises data acquisition system (DAS), and its two ends are connected with incident bar and transmission bar respectively by foil gauge, for gathering the stress wave signal in incident bar and transmission bar.
Experimental provision of the present invention also comprises heat-shrink tube rubber sleeve, described sample surrounding except two ends is smeared silica gel and is placed in heat-shrink tube rubber sleeve, and ensure that sample and confined pressure hydraulic oil are isolated, sample two ends is alignd with incident bar and transmission bar axle center respectively.
Experimental provision of the present invention also comprises heat-shrink tube rubber sleeve, described sample surrounding except two ends is smeared silica gel and is placed in heat-shrink tube rubber sleeve, and ensure that sample and confined pressure hydraulic oil are isolated, sample two ends is alignd with incident bar and transmission bar axle center respectively.
Experimental provision of the present invention also comprises the axial static pressure of incidence end and loads baffle plate, connecting rod, fixed screw, axial static pressure loads bunker O-ring seal, fixture splice on incident bar and transmission bar, wherein incident bar becomes convex with the fixture splice on transmission bar, the groove that outstanding position on incident bar loads baffle center position with the axial static pressure of incidence end is connected, outstanding position on transmission bar and axial static pressure load oil pressure storehouse and are connected, form hydraulic piston, load bunker O-ring seal by axial static pressure respectively in the contact position that described axial static pressure loads oil pressure storehouse and transmission bar to seal, axial static pressure loading oil pressure storehouse is loaded baffle plate with the axial static pressure of incidence end and is connected by two connecting rods, load at described connecting rod and axial static pressure the junction that oil pressure storehouse and incidence end axis static pressure load baffle plate to be fixed by fixed screw respectively, form the fixed frame of axial static pressure loading procedure, load hydraulic oil pump by axial static pressure petroleum pipeline and axial static pressure to be connected, realize loading the axial static pressure of sample.
According to a further aspect in the invention, provide a kind of sample multi-field coupling experimental method, comprise the steps:
(1) sample surrounding except two ends is smeared silica gel and be placed in heat-shrink tube rubber sleeve, sample two ends is alignd with incident bar and transmission bar axle center respectively, makes sample be in sealing state, keeps completely cutting off with the hydraulic oil in confining pressure device;
(2) the axial static pressure of the axial loading device of transmission bar is loaded hydraulic oil pump to open, make sample apply certain axial static pressure;
(3) confined pressure is loaded hydraulic oil pump to open, make sample apply certain radial confined pressure;
(4) gas gas tank will be opened, and regulate gas pressure, make sample incident bar end apply certain gas pressure, open aspiration pump, make sample throwing-stick end produce certain negative pressure, impel Gas Flow, make sample be in gas environment;
(5) close aspiration pump, make sample be in certain gas pressure occurrence condition, under regulating air inlet gas pressure variable valve to make device in Gas be pressed in pressure constant state, keep one section of Preset Time, until coal petrography sample is in be rich in gas state;
(6) open cold, hot two-purpose compressor, regulation output temperature, opens servopump, makes the hydraulic oil in confining pressure device and sample be in design temperature state;
(7) mobile absorbing rod, makes the tight axle center of itself and transmission bar align;
(8) open data acquisition system (DAS), gather the stress wave signal in incident bar and throwing-stick;
(9) closed gas pressure-regulating valve, servopump;
(10) launch drift, drift clashes into incident bar and produces stress wave, and stress wave imports coal petrography sample into by incident bar connection end, and imports transmission bar into by transmission bar connection end and import absorbing rod into;
(11) data acquisition system (DAS) collects the stress wave signal on incident bar and transmission bar by foil gauge, the data-signal collected is carried out data processing, obtains the dynamic characteristics curve of coal petrography under this axial static load, radial confined pressure static load, gas pressure, temperature multi-scenarios method state.
Experimental technique of the present invention, wherein when the firedamp sensor on gas escape pipe monitors constant gas density and flow, closes aspiration pump.
Experimental technique of the present invention, wherein said data acquisition system (DAS) is traditional SHPB equipment.
Experimental technique of the present invention, wherein said axial static pressure and radial confined pressure are all 10MPa.
Experimental technique of the present invention, wherein said gas pressure is 1Mpa, and described design temperature is 35 degrees Celsius.
The present invention has following beneficial effect: what adopt technique scheme uses multi-scenarios method coal petrography impact experiment apparatus, by axial static load device, coal petrography sample can be made to be in axial static stress state; Confining pressure device, can make coal sample sample be in radial confined pressure static stress state; Be arranged on the emptying aperture in sample two ends incident bar and transmission bar, be connected with gas gas tank and aspiration pump respectively, sample can be made to be in certain gas bearing state; Be connected with cold, hot two-purpose compressor by the cold and hot petroleum pipeline be arranged in confining pressure device, sample can be made to be in predetermined state of temperature; By be combineding with each other with SHPB device, dynamic load is impacted under can realizing axial static load, radial confined pressure static load, gas pressure, temperature multi-scenarios method state, simulation multi-scenarios method state coal petrography Shock stress Wave load mode, can reproduce the destruction characteristic of the on-the-spot coal and rock of underground coal back production by power loading more accurately by coal petrography sample multi-scenarios method characteristic.To in the coal exploitation process of further research and probe deep, adopt disturbance and bring out coal and non-coal dynamic disaster mechanism, and then provide theoretical foundation for deepen coal resource safety, high winning technology.
In sum, the present invention is that one can realize experimentation coal petrography sample and is in multi-scenarios method state, ensures that coal petrography sample is in axial static load, radial confined pressure static load, gas pressure, temperature couple state, for the impact experiment apparatus of coal petrography multi-scenarios method state.
Accompanying drawing explanation
Fig. 1 is traditional SHPB structural representation.
Fig. 2 is the structural representation for static stress, shock vibration, gas bearing, temperature multi-scenarios method state coal petrography impact experiment apparatus according to an embodiment of the invention.
Fig. 3 is axial loading device structural representation.
Fig. 4 is the sample heating process temperature curve over time measured by temperature control equipment.
Fig. 5 is the signal arrived according to the data acquisition system of the embodiment of Fig. 2.
Fig. 6 is the dynamic stress strain curve of coal petrography at axial static load 10MPa, radial confined pressure 10MPa, methane gas 1MPa, temperature 35 degrees Celsius obtained according to the embodiment of Fig. 2.
Number in the figure:
1-drift; 2-incident bar; 3-foil gauge; 4-sample; 5-transmission bar; 6-absorbing rod; 7-data acquisition system (DAS); 8-axial static pressure charger; 9-axial static pressure loads hydraulic oil pump; 10-axial static pressure petroleum pipeline; 11-confined pressure loads hydraulic oil pump; 12-confined pressure loads petroleum pipeline; 13-radial confined pressure charger; 14-heat-shrink tube rubber sleeve; 15-gas gas tank; 16-gas inlet pipe; 17-gas pressure variable valve; 18-aspiration pump; 19-firedamp sensor; 20-gas escape pipe; 21-cold, hot two-purpose compressor; 22-servopump; 23-cold, hot two-purpose woven hose; 24-axial static pressure loads oil pressure storehouse; The axial static pressure of 25-incidence end loads baffle plate; 26-connecting rod; 27-fixed screw; 28-axial static pressure loads bunker O-ring seal 1; 29-axial static pressure loads bunker O-ring seal 2; Fixture splice on 30-incident bar and transmission bar.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described.
See Fig. 2, show the structural representation for static stress, shock vibration, gas bearing, temperature multi-scenarios method state coal petrography impact experiment apparatus according to an embodiment of the invention.Compare the traditional SHPB structural representation shown in Fig. 1, Fig. 2 is the equipment schematic diagram after traditional SHPB loads new equipment.
In Fig. 2, drift 1 moves to incident bar 2, incident bar 2, transmission bar 5, absorbing rod 6 conllinear, the axial static pressure device 8 in sample multi-scenarios method experimental provision, radial confining pressure device 13 is provided with between the transmission bar of incident bar 2 and transmission bar 5, sample 4 is placed in radial confining pressure device 13, and sample 4 and incident bar 2, transmission bar 5, absorbing rod 6 conllinear.Arrange foil gauge 3 respectively in incident bar 2, transmission bar 5, twisted pair line connection is passed through with incident bar 2 and transmission bar 5 respectively by foil gauge 3 in the two ends of data acquisition system (DAS) 7.Axial static pressure device 8, wherein incident bar 2 and transmission bar 5 arrange fixture splice 30 near sample site, fixture splice 30 one-tenth convex, the groove that fixture splice 30 position on incident bar 2 loads baffle plate 25 centre with the axial static pressure of incidence end is connected, prominent fixture splice 30 position on transmission bar 5 loads oil pressure storehouse 24 with axial static pressure and is connected, form hydraulic piston, load bunker O-ring seal 28 and 29 by axial static pressure in described axial static pressure loading oil pressure storehouse 24 respectively with the contact position of transmission bar 5 to seal, axial static pressure loading oil pressure storehouse 24 is loaded baffle plate 25 with the axial static pressure of incidence end and is connected by two connecting rods 26, load at described connecting rod 26 and axial static pressure the junction that oil pressure storehouse 24 and the axial static pressure of incidence end load baffle plate 25 to be fixed by fixed screw 27 respectively, form the fixed frame of axial static pressure loading procedure, load hydraulic oil pump 9 by axial static pressure petroleum pipeline 10 and axial static pressure to be connected, realize loading the axial static pressure of sample.Radial confining pressure device 13 loads hydraulic oil pump 11 by confined pressure loading petroleum pipeline 12 with confined pressure and is connected, and realizes loading the static confined pressure of the radial direction of sample.At described incident bar 2 near the position of sample 4, offer emptying aperture in incident bar 2 axle center to be connected with gas gas tank 15 with gas pressure variable valve 17 by gas inlet pipe 16, at described transmission bar 5 near the position of sample 4, offer emptying aperture in transmission bar 5 axle center to be connected with aspiration pump 18 with firedamp sensor 19 by gas escape pipe 20, realize sample experiment process and be in gas bearing state.The specimen temperature control device be made up of cold, hot two-purpose compressor 21, servo oil pump 22, cold, hot two-purpose petroleum pipeline 23 is set in described radial confining pressure device 13, in radial confining pressure device 13, cold, hot two-purpose petroleum pipeline 23 is set, be connected with cold, hot two-purpose compressor 21 by servo oil pump 22, the temperature realizing sample experiment process controls.
Experimental technique for multi-scenarios method state coal petrography impact experiment apparatus of the present invention is as follows:
The SHPB device of multi-scenarios method device is tested this structure dynamic of coal petrography under axial static load 10MPa, radial confined pressure 10MPa, methane gas 1MPa, temperature 35 degrees celsius.Certainly, experimental provision of the present invention is used also can to test the mechanical characteristic of the coal petrography under other axial static loads, radial confined pressure, methane gas pressure and environment temperature.The detailed step of experimental technique of the present invention is as follows:
(1) sample 4 surrounding except two ends is smeared silica gel and be placed in heat-shrink tube rubber sleeve 14, sample 4 two ends is alignd with incident bar 2 and transmission bar 5 axle center respectively, makes sample be in sealing state, keeps completely cutting off with the hydraulic oil in radial confining pressure device 13;
(2) the axial static pressure of the axial loading device 8 of transmission bar 5 is loaded hydraulic oil pump 9 to open, load in oil pressure storehouse 24 to axial static pressure and add hydraulic oil, pass transmission bar 5 and compress sample 4 to the advance of sample 4 direction, when sample 4 bears the axial static pressure of 10MPa, closing axle loads hydraulic oil pump 9 to static pressure, keeps sample 4 to apply the axial static pressure of 10MPa;
(3) confined pressure is loaded hydraulic oil pump 11 to open, in radial confined pressure charger 13, add hydraulic oil, when sample 4 bears the radial confined pressure of 10MPa, close confined pressure and load hydraulic oil pump 11, keep sample 4 to apply the radial confined pressure of 10MPa;
(4) gas gas tank 14 will be opened, regulate gas pressure variable valve 17, output methane gas pressure is made to be 1MPa, sample incident bar end is made to apply certain gas pressure, open aspiration pump 18, sample throwing-stick end is made to produce certain negative pressure, impel Gas Flow, when the firedamp sensor 19 on gas escape pipe 20 monitors constant gas density and flow, close aspiration pump 18, keep the gas pressure 1MPa in gas inlet pipe 16, sample 4 is fully adsorbed, ensure that sample 4 is in saturated gas bearing environment;
(5) cold, hot two-purpose compressor 21 is opened, regulation output temperature 35 degrees Celsius, open servopump 22, make the heat transfer fluid in cold, hot two-purpose compressor 21 through making cold, hot two-purpose woven hose 23 in confining pressure device carry out heat exchange circulation, ensure that radial confined pressure charger 13 and sample 4 are in design temperature state, the change of heating process specimen temperature as shown in Figure 4.
(7) mobile absorbing rod 6, makes it closely align in axle center with transmission bar 5;
(8) open data acquisition system (DAS) 7, this data acquisition system (DAS) is traditional SHPB equipment, and for gathering the stress wave signal in incident bar 3 and throwing-stick 5, its structure is common practise to those skilled in the art;
(9) closed gas pressure-regulating valve 17, gas gas tank 15, servopump 22;
(10) launch drift 1, drift 1 clashes into incident bar 2 and produces stress wave, and stress wave imports coal petrography sample 4 into by incident bar 2, imports transmission bar 5 into and import absorbing rod 6 into by sample 4;
(11) data acquisition system (DAS) collects the stress wave signal of on incident bar 2 and transmission bar 5 by foil gauge 3, as shown in legend 5, carry out data processing by the data-signal collected, obtain the dynamic characteristics curve of coal petrography under this axial static load, radial confined pressure static load, gas pressure, temperature multi-scenarios method state.The dynamic stress strain curve of coal petrography such as shown in Fig. 6 under 1MPa gas pressure.
Above each embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that the common engineering technical personnel in this area make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (10)
1. a multi-scenarios method state impact experiment apparatus, comprise axial static pressure charger, axial static pressure load hydraulic oil pump, axial static pressure petroleum pipeline, confined pressure load hydraulic oil pump, confined pressure loads petroleum pipeline, radial confined pressure charger, gas gas tank, gas inlet pipe, gas pressure variable valve, aspiration pump, firedamp sensor, gas escape pipe, cold, hot two-purpose compressor, servo oil pump, cold, hot two-purpose petroleum pipeline, it is characterized in that:
Described axial static pressure charger is set between the stress wave incident bar and transmission bar at the two ends of coal petrography sample, described radial confined pressure charger is set in axial static pressure charger middle sample position;
Air admission hole and venthole are offered in incident bar at sample two ends and transmission bar center, be connected with gas inlet pipe and gas escape pipe respectively, gas inlet pipe is connected with gas gas tank by gas pressure variable valve, gas escape pipe is connected with aspiration pump by firedamp sensor, realizes experimentation sample and is in gas bearing environment;
Cold, hot two-purpose petroleum pipeline is set in confined pressure charger, is connected with cold, hot two-purpose compressor by servo oil pump, realize controlling sample experiment process temperature.
2. experimental provision according to claim 1, is characterized in that: described axial static pressure charger loads hydraulic oil pump by axial static pressure petroleum pipeline and axial static pressure and is connected, and realizes loading the axial static pressure of sample; Described radial confined pressure charger loads hydraulic oil pump by confined pressure loading petroleum pipeline with confined pressure and is connected, and realizes loading the static confined pressure of the radial direction of sample.
3. experimental provision according to claim 1, is characterized in that: also comprise data acquisition system (DAS), its two ends are connected with incident bar and transmission bar respectively by foil gauge, for gathering the stress wave signal in incident bar and transmission bar.
4. according to the experimental provision in claim 1-3 described in any one, it is characterized in that: also comprise heat-shrink tube rubber sleeve, described sample surrounding except two ends is smeared silica gel and is placed in heat-shrink tube rubber sleeve, ensure that sample and confined pressure hydraulic oil are isolated, sample two ends is alignd with incident bar and transmission bar axle center respectively.
5. according to the experimental provision in claim 1-3 described in any one, it is characterized in that: also comprise the axial static pressure of incidence end and load baffle plate, connecting rod, fixed screw, axial static pressure loads bunker O-ring seal, fixture splice on incident bar and transmission bar, wherein incident bar becomes convex with the fixture splice on transmission bar, the groove that outstanding position on incident bar loads baffle center position with the axial static pressure of incidence end is connected, outstanding position on transmission bar and axial static pressure load oil pressure storehouse and are connected, form hydraulic piston, load bunker O-ring seal by axial static pressure respectively in the contact position that described axial static pressure loads oil pressure storehouse and transmission bar to seal, axial static pressure loading oil pressure storehouse is loaded baffle plate with the axial static pressure of incidence end and is connected by two connecting rods, load at described connecting rod and axial static pressure the junction that oil pressure storehouse and incidence end axis static pressure load baffle plate to be fixed by fixed screw respectively, form the fixed frame of axial static pressure loading procedure, load hydraulic oil pump by axial static pressure petroleum pipeline and axial static pressure to be connected, realize loading the axial static pressure of sample.
6. adopt a sample multi-field coupling experimental method for the multi-scenarios method state impact experiment apparatus according to any one of claim 1-5, comprise the steps:
(1) sample surrounding except two ends is smeared silica gel and be placed in heat-shrink tube rubber sleeve, sample two ends is alignd with incident bar and transmission bar axle center respectively, makes sample be in sealing state, keeps completely cutting off with the hydraulic oil in confining pressure device;
(2) the axial static pressure of the axial loading device of transmission bar is loaded hydraulic oil pump to open, make sample apply certain axial static pressure;
(3) confined pressure is loaded hydraulic oil pump to open, make sample apply certain radial confined pressure;
(4) gas gas tank will be opened, and regulate gas pressure, make sample incident bar end apply certain gas pressure, open aspiration pump, make sample throwing-stick end produce certain negative pressure, impel Gas Flow, make sample be in gas environment;
(5) close aspiration pump, make sample be in certain gas pressure occurrence condition, under regulating air inlet gas pressure variable valve to make device in Gas be pressed in pressure constant state, keep one section of Preset Time, until coal petrography sample is in be rich in gas state;
(6) open cold, hot two-purpose compressor, regulation output temperature, opens servopump, makes the hydraulic oil in confining pressure device and sample be in design temperature state;
(7) mobile absorbing rod, makes the tight axle center of itself and transmission bar align;
(8) open data acquisition system (DAS), gather the stress wave signal in incident bar and throwing-stick;
(9) closed gas pressure-regulating valve, servopump;
(10) launch drift, drift clashes into incident bar and produces stress wave, and stress wave imports coal petrography sample into by incident bar connection end, and imports transmission bar into by transmission bar connection end and import absorbing rod into;
(11) data acquisition system (DAS) collects the stress wave signal on incident bar and transmission bar by foil gauge, the data-signal collected is carried out data processing, obtains the dynamic characteristics curve of coal petrography under this axial static load, radial confined pressure static load, gas pressure, temperature multi-scenarios method state.
7. experimental technique according to claim 6, is characterized in that: when the firedamp sensor on gas escape pipe monitors constant gas density and flow, closes aspiration pump.
8. experimental technique according to claim 7, is characterized in that: described data acquisition system (DAS) is traditional SHPB equipment.
9. according to the experimental technique in claim 6-8 described in any one, it is characterized in that: described axial static pressure and radial confined pressure are all 10MPa.
10. according to the experimental technique in claim 6-8 described in any one, it is characterized in that: described gas pressure is 1MPa, described design temperature is 35 degrees Celsius.
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