CN103454164A - Multi-field coupled coal rock impact loading experimental device and method - Google Patents
Multi-field coupled coal rock impact loading experimental device and method Download PDFInfo
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Abstract
The invention relates to a multi-field coupled coal rock impact loading experimental device and method. The experimental device comprises an axial static pressure loading device, an axial static pressure loading hydraulic oil pump, an axial static pressure oil delivery pipe, an ambient pressure loading hydraulic oil pump, an ambient pressure loading oil delivery pipe, a radial ambient pressure loading device, a gas tank, a gas inlet pipe, a gas pressure regulating valve, an air extracting pump, a gas sensor, a gas outlet pipe, a cold and hot dual-purpose compressor, a servo oil pump and a cold and hot dual-purpose oil delivery pipe. By using the experimental device and method, a coal rock sample can be in a multi-field coupling state and the condition that the coal rock sample is in axial static loading, radial ambient pressure static loading, gas pressure and temperature coupling states, so that an experiment can be carried out aiming to the dynamic loading conditions.
Description
Technical field
The invention belongs to coal petrography mechanical property testing technical field, more specifically, relate to a kind of for simulating static stress, temperature, many couple state coal petrography impact loading experiment devices of gas adsorption and experimental technique.
Background technology
In the recovery process of underground coal resource, a large amount of use mechanization to combine to adopt cutting coal machine to coal petrography carry out fragmentation, goaf top plate cycle across fall and workplace near the work such as Blasting Excavation of rock gangway the workplace coal and rock is brought to obvious dynamic impact problem disturbance, cause the 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 to explore the dynamic characteristics of coal petrography Shock Loading.These dynamic characteristics normally by experiment chamber carry out all kinds of impact experiments and obtain, at present application extensively and also the reliable impact experiment system of result be SHPB(split Hopkinson pressure bar, split hopkinson press bar) device, and improved various deformation device thus.
Numerous scholars think that the coal rock gas dynamic disaster in the coal exploitation process of deep is the coefficient result of physico mechanical characteristic by terrestrial stress, gas, ground temperature, exploitation disturbance, coal petrography.In traditional SHPB experiment, institute's test sample is often in room temperature be exposed among air, cause the experimentation specimen temperature tested seasonal variations and change, compose in the gas exposure air of depositing in coal petrography the desorption of mash gas effect will occur simultaneously, cause methane gas in the coal petrography sample to break away from, almost no longer contain methane gas in sample.Yet, China's coal seam major part is the coal seam of containing the Permo-carboniferous period that enriches gas (being mainly methane CH4), continuous increase along with the coal resources back production degree of depth, the coal and rock gas bearing capacity also is increase trend, unmind coal body in being rich in the gas state, more than the gas pressure of deep under ground can reach 10MPa, in coal and rock, gas bearing capacity is far away higher than gas bearing capacity in the traditional experiment sample; While is with the continuous increase of the exploitation of coal resources degree of depth, geotemperature increases with the speed of every 100 meters 3 degrees centigrade, the coal resources of the back production 1 km degree of depth of take are example, the temperature of its coal petrography itself can reach 40 degrees centigrade, increase with mining depth also will further be increased, and under gas bearing and hot conditions effect, the mechanical characteristic of coal petrography and traditional experiment result have bigger difference.Therefore, develop corresponding many coupling coal petrography impact loading devices, the crash characteristics carried out under static stress, gas bearing, many, temperature field coupling condition has been tested the work of urgently carrying 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 is carried the combination loading experimental apparatus, but such experimental provision, sample is exposed in air, can't carry out coal and rock mechanical characteristic experiment under the simulation gas environment; (2) gas-solid Environmental coupling, the gas environment dynamics experimental device, such experimental provision, under the static test-machine loading environment, carry out methane gas at the static quasistatic loading procedure of coal and rock, adsorption-desorption and seepage characteristic experiment.
Yet in the progress of coal mining of deep, coal and rock is born strong power disturbance, High-geotemperature and the high gas pressure acting in conjunction of high-ground stress static load, recovery process, it is subject to force mode is no longer independent static stress, dynamic loading, temperature or gas pressure effect, but the 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 can provide coal petrography characterisitic parameter more accurately 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 characteristics in the deepen coal resource exploitation process, could not consider the defect of stress coupling and Gas-solid Coupling for existing coal petrography Experiments of Machanics method and apparatus, provide a kind of and can realize many coupling conditions of coal petrography sample at terrestrial stress, energetic disturbance, gas bearing, ground temperature, many coupled surge loading experimental apparatus that more meet with engineering reality and method.
For solving the problems of the technologies described above, according to one side, a kind of many couple state impact experiment apparatus, comprise axial static pressure charger, axially static pressure loads hydraulic oil pump, axial static pressure petroleum pipeline, confined pressure loads hydraulic oil pump, confined pressure loads petroleum pipeline, confined pressure charger radially, the gas gas tank, gas inlet pipe, the gas pressure variable valve, aspiration pump, firedamp sensor, the gas escape pipe, the cold, hot two-purpose compressor, servo oil pump, the cold, hot two-purpose petroleum pipeline, it is characterized in that: between the stress wave incident bar at the two ends of coal petrography sample and transmission bar, described axial static pressure charger is set, in axial static pressure charger middle sample position, described radially confined pressure charger is set, air admission hole and venthole are offered in incident bar and transmission bar center at the sample two ends, with gas inlet pipe, with the gas escape pipe, be connected respectively, gas inlet pipe is connected with the gas gas tank by the gas pressure variable valve, the gas escape pipe is connected with aspiration pump by firedamp sensor, realizes that the experimentation sample is in the gas bearing environment, the cold, hot two-purpose petroleum pipeline is set in the confined pressure charger, is connected with the cold, hot two-purpose compressor by servo oil pump, realize sample experimentation temperature is controlled.
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 the axial static pressure of sample is loaded; Described radially confined pressure charger loads petroleum pipeline by confined pressure and is connected with confined pressure loading hydraulic oil pump, realizes the radially static confined pressure of sample is loaded.
Experimental provision of the present invention also comprises data acquisition system (DAS), and its two ends are connected with transmission bar with incident bar respectively by foil gauge, for gathering the stress wave signal of incident bar and transmission bar.
Experimental provision of the present invention also comprises the heat-shrink tube rubber sleeve, described sample surrounding except two ends is smeared to silica gel and be placed in the heat-shrink tube rubber sleeve, guarantees sample and the isolation of confined pressure hydraulic oil, and the sample two ends is alignd with incident bar and transmission bar axle center respectively.
Experimental provision of the present invention also comprises the heat-shrink tube rubber sleeve, described sample surrounding except two ends is smeared to silica gel and be placed in the heat-shrink tube rubber sleeve, guarantees sample and the isolation of confined pressure hydraulic oil, and the sample two ends is alignd with incident bar and transmission bar axle center respectively.
Experimental provision of the present invention also comprises that the axial static pressure of incident end loads baffle plate, connecting rod, fixed screw, axially static pressure loads the bunker O-ring seal, fixture splice on incident bar and transmission bar, wherein incident bar becomes convex with the fixture splice on transmission bar, outstanding position on incident bar is connected with the groove that the axial static pressure of incident end loads the baffle plate centre, outstanding position on transmission bar loads the oil pressure storehouse with axial static pressure and is connected, form hydraulic piston, the contact position that loads oil pressure storehouse and transmission bar at described axial static pressure is sealed by axial static pressure loading bunker O-ring seal respectively, axially static pressure loading oil pressure storehouse is connected by two connecting rods with the axial static pressure loading of incident end baffle plate, junction at described connecting rod and axial static pressure loading oil pressure storehouse and the axial static pressure loading of incident end baffle plate is fixed by fixed screw respectively, form the fixed frame of axial static pressure loading procedure, loading hydraulic oil pump by axial static pressure petroleum pipeline and axial static pressure is connected, realization loads the axial static pressure of sample.
According to a further aspect in the invention, provide a kind of sample multi-field coupling experimental method, comprised the steps:
(1) sample surrounding except two ends is smeared to silica gel and be placed in the heat-shrink tube rubber sleeve, the sample two ends is alignd with incident bar and transmission bar axle center respectively, makes sample in sealing state, and maintenance is isolated with the hydraulic oil in confining pressure device;
(2) the axial static pressure of the axial loading device of transmission bar is loaded to hydraulic oil pump and open, make sample apply certain axially static pressure;
(3) confined pressure is loaded to hydraulic oil pump and open, make sample apply certain radially confined pressure;
(4) will open the gas gas tank, regulate gas pressure, and make sample incident bar end apply certain gas pressure, open aspiration pump, and make sample throwing-stick end produce certain negative pressure, impel Gas Flow, and make sample in gas environment;
(5) close aspiration pump, make sample in certain gas pressure occurrence condition, regulate air inlet gas pressure variable valve and make device in Gas be pressed in one section Preset Time of maintenance under pressure constant state, until the coal petrography sample is in being rich in the gas state;
(6) open the cold, hot two-purpose compressor, the regulation output temperature, open servopump, makes hydraulic oil in confining pressure device and sample in the design temperature state;
(7) mobile absorbing rod, align the tight axle center of itself and transmission bar;
(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) emission drift, drift clashes into incident bar and produces stress wave, and stress wave imports the coal petrography sample into by the incident bar connection end, and imports transmission bar into and import absorbing rod into by the transmission bar connection end;
(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 to the data processing, obtain this axial static load, the dynamic characteristics curve of coal petrography under confined pressure static load, gas pressure, many couple states of temperature radially.
Experimental technique of the present invention, when wherein the firedamp sensor on the gas escape pipe monitors constant gas density and flow, close 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 radially confined pressure be all 10MPa.
Experimental technique of the present invention, wherein said gas pressure is 1Mpa, described design temperature is 35 degrees centigrade.
The present invention has following beneficial effect: adopt many coupling coal petrography impact experiment apparatus of use of technique scheme, by the axial static load device, can make the coal petrography sample in the axial static stress state; Confining pressure device, can make the coal sample sample in confined pressure static stress state radially; Be arranged on the emptying aperture in sample two ends incident bar and transmission bar, be connected with aspiration pump with the gas gas tank respectively, can make sample in certain gas bearing state; Be connected with the cold, hot two-purpose compressor by the cold and hot petroleum pipeline be arranged in confining pressure device, can make sample in predetermined state of temperature; By mutually combining with the SHPB device, can realize axial static load, radially under confined pressure static load, gas pressure, many couple states of temperature, impact dynamic load, simulate many couple state coal petrography shock stress ripple load modes, by many coupled characteristics of coal petrography sample, can reproduce more accurately the destruction characteristic that the on-the-spot coal and rock of underground coal back production is loaded by power.In the coal exploitation process of further research and probe deep, adopt disturbance and bring out coal and gas dynamical disaster mechanism, and then for deepen coal resource safety, efficiently back production provides theoretical foundation.
In sum, the present invention a kind ofly can realize that experimentation coal petrography sample is in many couple states, guarantees that the coal petrography sample is in axial static load, radially confined pressure static load, gas pressure, temperature couple state, for the impact experiment apparatus of many couple states of coal petrography.
The accompanying drawing explanation
Fig. 1 is traditional SHPB structural representation.
Fig. 2 is the structural representation for static stress, shock vibration, gas bearing, many couple state coal petrography impact experiment apparatus of temperature according to an embodiment of the invention.
Fig. 3 is the axial loading device structural representation.
Fig. 4 is the sample heating process temperature measured according to temperature control equipment curve over time.
Fig. 5 is the signal that the data acquisition system (DAS) according to the embodiment of Fig. 2 collects.
Fig. 6 is the coal petrography that obtains of the embodiment according to Fig. 2 at axial static load 10MPa, the dynamic stress strain curve at 35 degrees centigrade of confined pressure 10MPa, methane gas 1MPa, temperature radially.
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-axially static pressure chargers; 9-axially static pressure load hydraulic oil pump; 10-axially static pressure petroleum pipelines; 11-confined pressure loads hydraulic oil pump; 12-confined pressure loads petroleum pipeline; 13-radially confined pressure chargers; 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-axially static pressure load the oil pressure storehouse; The axial static pressure of 25-incident end loads baffle plate; 26-connecting rod; 27-fixed screw; 28-axially static pressure load bunker O-ring seal 1; 29-axially static pressure load 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.
Referring to Fig. 2, show the structural representation for static stress, shock vibration, gas bearing, many couple state coal petrography impact experiment apparatus of temperature 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 is to incident bar 2 motions, incident bar 2, transmission bar 5, absorbing rod 6 conllinear, be provided with axial static pressure device 8 in many coupling experiment devices of sample, confining pressure device 13 radially between the transmission bar of incident bar 2 and transmission bar 5, the radially interior placement sample 4 of confining pressure device 13, and sample 4 and incident bar 2, transmission bar 5, absorbing rod 6 conllinear.Incident bar 2, the interior foil gauge 3 that arranges respectively of 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 on incident bar 2 and transmission bar 5, near sample site, fixture splice 30 is set, 30 one-tenth convex of fixture splice, fixture splice 30 positions on incident bar 2 are connected with the groove that the axial static pressure of incident end loads baffle plate 25 centres, prominent fixture splice 30 positions on transmission bar 5 load oil pressure storehouse 24 with axial static pressure and are connected, form hydraulic piston, loading oil pressure storehouse 24 at described axial static pressure is sealed by axial static pressure loading bunker O- ring seal 28 and 29 respectively with the contact position of transmission bar 5, axially static pressure loading oil pressure storehouse 24 is connected by two connecting rods 26 with the axial static pressure loading of incident end baffle plate 25, at described connecting rod 26 and axial static pressure loading oil pressure storehouse 24, with the junction that the axial static pressure of incident end loads baffle plate 25, by fixed screw 27, be fixed respectively, form the fixed frame of axial static pressure loading procedure, loading hydraulic oil pump 9 by axial static pressure petroleum pipeline 10 and axial static pressure is connected, realization loads the axial static pressure of sample.Radially confining pressure device 13 loads petroleum pipeline 12 and confined pressure by confined pressure and loads hydraulic oil pump 11 and be connected, realizes the radially static confined pressure loading to sample.Position at described incident bar 2 near sample 4, offer emptying aperture is connected with gas gas tank 15 with gas pressure variable valve 17 by gas inlet pipe 16 in incident bar 2 axle center, position at described transmission bar 5 near sample 4, offer emptying aperture in transmission bar 5 axle center and be connected with aspiration pump 18 with firedamp sensor 19 by gas escape pipe 20, realize that the sample experimentation is in the gas bearing state.The specimen temperature control device formed by cold, hot two-purpose compressor 21, servo oil pump 22, cold, hot two-purpose petroleum pipeline 23 in the interior setting of described radially confining pressure device 13, at the interior cold, hot two-purpose petroleum pipeline 23 that arranges of confining pressure device 13 radially, be connected with cold, hot two-purpose compressor 21 by servo oil pump 22, realize that the temperature of sample experimentation is controlled.
Experimental technique for many couple state coal petrography impact experiment apparatus of the present invention is as follows:
Test axial static load 10MPa, dynamic this structure of coal petrography under confined pressure 10MPa, methane gas 1MPa, temperature 35 degrees celsius radially on the SHPB of many coupling devices device.Certainly, use experimental provision of the present invention also can test other axial static loads, the mechanical characteristic of the coal petrography under confined pressure, methane gas pressure and environment temperature radially.The detailed step of experimental technique of the present invention is as follows:
(1) sample 4 surrounding except two ends is smeared to silica gel and be placed in heat-shrink tube rubber sleeve 14, sample 4 two ends are alignd with incident bar 2 and transmission bar 5 axle center respectively, make sample in sealing state, keep with confining pressure device 13 radially in hydraulic oil isolated;
(2) the axial static pressure of the axial loading device of transmission bar 58 being loaded to hydraulic oil pump 9 opens, load in oil pressure storehouse 24 and add hydraulic oil to axial static pressure, passing transmission bar 5 advances and compresses sample 4 to sample 4 directions, 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 to hydraulic oil pump 11 and open, to radially in confined pressure charger 13, adding hydraulic oil, when sample 4 bears the radially confined pressure of 10MPa, close confined pressure and load hydraulic oil pump 11, keep sample 4 to apply radially confined pressure of 10MPa;
(4) will open gas gas tank 14, regulate gas pressure variable valve 17, making to export methane gas pressure is 1MPa, make sample incident bar end apply certain gas pressure, open aspiration pump 18, make sample throwing-stick end 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, guarantee that sample 4 is in saturated gas bearing environment;
(5) open cold, hot two-purpose compressor 21,35 degrees centigrade of regulation output temperature, open servopump 22, make the heat transfer fluid process in cold, hot two-purpose compressor 21 make cold, hot two-purpose woven hose 23 in confining pressure device carry out heat exchange circulation, guarantee that radially confined pressure charger 13 and sample 4 are in the design temperature state, the heating process specimen temperature changes as shown in Figure 4.
(7) mobile absorbing rod 6, make it align with the tight axle center of 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 of incident bar 3 and throwing-stick 5, its structure is common practise to those skilled in the art;
(9) the closed gas pressure-regulating valve 17, gas gas tank 15, servopump 22;
(10) emission 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, by sample 4, imports transmission bar 5 into and imports absorbing rod 6 into;
(11) data acquisition system (DAS) collects on incident bar 2 and transmission bar 5 stress wave signal by foil gauge 3, as shown in legend 5, carry out the data processing by the data-signal collected, obtain this axial static load, the dynamic characteristics curve of coal petrography under confined pressure static load, gas pressure, many couple states of temperature radially.The dynamic stress strain curve of example coal petrography as shown in Figure 6 under the 1MPa gas pressure.
Each above embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention, all should fall in the definite protection domain of claims of the present invention.
Claims (10)
1. one kind many couple state impact experiment apparatus, comprise axial static pressure charger, axially static pressure loads hydraulic oil pump, axially static pressure petroleum pipeline, confined pressure load hydraulic oil pump, confined pressure and load petroleum pipeline, radially 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 at the two ends of coal petrography sample and transmission bar, described axial static pressure charger is set, in axial static pressure charger middle sample position, described radially confined pressure charger is set;
Air admission hole and venthole are offered in incident bar and transmission bar center at the sample two ends, with gas inlet pipe, with the gas escape pipe, be connected respectively, gas inlet pipe is connected with the gas gas tank by the gas pressure variable valve, the gas escape pipe is connected with aspiration pump by firedamp sensor, realizes that the experimentation sample is in the gas bearing environment;
The cold, hot two-purpose petroleum pipeline is set in the confined pressure charger, is connected with the cold, hot two-purpose compressor by servo oil pump, realize sample experimentation temperature is controlled.
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, realizes the axial static pressure loading to sample; Described radially confined pressure charger loads petroleum pipeline by confined pressure and is connected with confined pressure loading hydraulic oil pump, realizes the radially static confined pressure of sample is loaded.
3. experimental provision according to claim 1, it is characterized in that: also comprise data acquisition system (DAS), its two ends are connected with transmission bar with incident bar respectively by foil gauge, for gathering the stress wave signal of incident bar and transmission bar.
4. according to any one described experimental provision in claim 1-3, it is characterized in that: also comprise the heat-shrink tube rubber sleeve, described sample surrounding except two ends is smeared to silica gel and be placed in the heat-shrink tube rubber sleeve, guarantee sample and the isolation of confined pressure hydraulic oil, the sample two ends is alignd with incident bar and transmission bar axle center respectively.
5. according to any one described experimental provision in claim 1-3, it is characterized in that: also comprise that the axial static pressure of incident end loads baffle plate, connecting rod, fixed screw, axially static pressure loads the bunker O-ring seal, fixture splice on incident bar and transmission bar, wherein incident bar becomes convex with the fixture splice on transmission bar, outstanding position on incident bar is connected with the groove that the axial static pressure of incident end loads the baffle plate centre, outstanding position on transmission bar loads the oil pressure storehouse with axial static pressure and is connected, form hydraulic piston, the contact position that loads oil pressure storehouse and transmission bar at described axial static pressure is sealed by axial static pressure loading bunker O-ring seal respectively, axially static pressure loading oil pressure storehouse is connected by two connecting rods with the axial static pressure loading of incident end baffle plate, junction at described connecting rod and axial static pressure loading oil pressure storehouse and the axial static pressure loading of incident end baffle plate is fixed by fixed screw respectively, form the fixed frame of axial static pressure loading procedure, loading hydraulic oil pump by axial static pressure petroleum pipeline and axial static pressure is connected, realization loads the axial static pressure of sample.
6. a sample multi-field coupling experimental method, comprise the steps:
(1) sample surrounding except two ends is smeared to silica gel and be placed in the heat-shrink tube rubber sleeve, the sample two ends is alignd with incident bar and transmission bar axle center respectively, makes sample in sealing state, and maintenance is isolated with the hydraulic oil in confining pressure device;
(2) the axial static pressure of the axial loading device of transmission bar is loaded to hydraulic oil pump and open, make sample apply certain axially static pressure;
(3) confined pressure is loaded to hydraulic oil pump and open, make sample apply certain radially confined pressure;
(4) will open the gas gas tank, regulate gas pressure, and make sample incident bar end apply certain gas pressure, open aspiration pump, and make sample throwing-stick end produce certain negative pressure, impel Gas Flow, and make sample in gas environment;
(5) close aspiration pump, make sample in certain gas pressure occurrence condition, regulate air inlet gas pressure variable valve and make device in Gas be pressed in one section Preset Time of maintenance under pressure constant state, until the coal petrography sample is in being rich in the gas state;
(6) open the cold, hot two-purpose compressor, the regulation output temperature, open servopump, makes hydraulic oil in confining pressure device and sample in the design temperature state;
(7) mobile absorbing rod, align the tight axle center of itself and transmission bar;
(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) emission drift, drift clashes into incident bar and produces stress wave, and stress wave imports the coal petrography sample into by the incident bar connection end, and imports transmission bar into and import absorbing rod into by the transmission bar connection end;
(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 to the data processing, obtain this axial static load, the dynamic characteristics curve of coal petrography under confined pressure static load, gas pressure, many couple states of temperature radially.
7. experimental technique according to claim 6, is characterized in that: when the firedamp sensor on the gas escape pipe monitors constant gas density and flow, close aspiration pump.
8. experimental technique according to claim 7, it is characterized in that: described data acquisition system (DAS) is traditional SHPB equipment.
9. according to any one described experimental technique in claim 6-8, it is characterized in that: described axial static pressure and radially confined pressure be all 10MPa.
10. according to any one described test method in claim 6-8, it is characterized in that: described gas pressure is 1MPa, and described design temperature is 35 degrees centigrade.
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