CN102809574A - Device for testing coupling function of multi-physics field of core rock and use method of device - Google Patents
Device for testing coupling function of multi-physics field of core rock and use method of device Download PDFInfo
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- CN102809574A CN102809574A CN2012102686416A CN201210268641A CN102809574A CN 102809574 A CN102809574 A CN 102809574A CN 2012102686416 A CN2012102686416 A CN 2012102686416A CN 201210268641 A CN201210268641 A CN 201210268641A CN 102809574 A CN102809574 A CN 102809574A
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Abstract
The invention discloses a device for testing a coupling function of a multi-physics field of core rock and a use method of the device. The device is a sealed barrel body which is composed of a top cover, a barrel body and a base disc; a column chamber and a temperature sensor are arranged in the device; a plunger is installed inside the column chamber; a pressure groove is arranged inside the barrel body; an airbag and a convex rubber piston are arranged inside the pressure groove; the airbag is connected with an external high pressure gas source; a gas pipeline for filling gas to the barrel body is arranged in the plunger; an acoustic emission sensor is installed inside the rubber piston; the acoustic emission sensor is connected with an external acoustic emission acquiring system; a gas discharge port is arranged on the base disc and is connected with a gas pressure difference transmitter, a gas mass flowmeter and a gas data acquirer; and electric heating wires are arranged inside the base disc. With the adoption of the device, not only the transformation and the acoustic emission activity of a coal test piece at different temperatures and stress states are recorded in real time, but also the absorption and desorption processes of coal-gas are carried out; and the visual microstructure characteristics of the coal test piece are quantified by using the CT (computed tomography) technology.
Description
Technical field
The present invention relates to a kind of proving installation that the grand microscopical structure of rock changes that satisfies, relate in particular to coal petrography multiple physical field coupling proving installation.
Background technology
The high-ground stress of deep formation, high-temperature and high pore pressure are the principal elements that influences the mine safety exploitation in the coal resources recovery process of deep, particularly are in minery territory rock mass and always receive temperature field, seepage field and stress field coupling influence.Be embodied in coal body changes from porosity, permeability, the thermal conduction capability that triaxial stress state is converted into bidirectional stress, coal body thereupon.Excavation back coal-bed gas can flow to the minery territory simultaneously, not only changes the initial pore pressure in coal seam, also changes the coal seam pore texture.The variation of gas seepage field also can influence the stratum heat flow field in addition, influences Stress Field Distribution with the temperature stress form, can influence the gas seepage field again simultaneously.It should be noted that; Complicated pore texture in the coal also adsorbs a large amount of gases; All can make the adsorption gas desorb become free state after the reduction of the rising of environment temperature or coal pore pressure; This process not only makes matrix of coal Surface Physical Chemistry change of properties, also causes pore pressure to raise again, further influences the coal pore texture, also can change free gas seepage field.Mining and must destroy the mobile equilibrium system that coal-bed gas seepage field, ground temperature field and stress field are formed in the deep, only in certain hour and spatial dimension, just can make whole coal-gas system reach mobile equilibrium new between the multiple physical field again through quality and energy exchange processes.
Therefore; The special mechanical behavior that research coal seam, deep shows under many coupling effects in complicated geological environment; See clearly the mutual relationship and the temporal and spatial evolution thereof of excavation damage zone coal body physico-mechanical properties and digging process; The multiple physical field coupling effect of analyzing excavation coal seam damage zone causes the calamity response, is the key problem that solves coal and gas burst accident in the deep mining.
At present, most of research methods are normally estimated coal test specimen outside surface deflection and macroscopical permeability variation in the physical coupling mechanism.Only the macroscopical physical property through coal is to be difficult to explaination coal petrography anisotropy deformation rule, especially opening with closed for crack in the matrix of coal regional area.CT technology relies on not damaged to detect quantitatively advantage such as reconstruct scanning object microscopical structure of characteristics in recent years, be widely used in that the research safe coal is exploited and the coal-seam gas industrial circle in rock-fluid coupled problem.Be not difficult to find that these CT pick-up units only consider the coal test specimen in static pressure adsorbed gas, fail to consider that the effect of many physical coupling influences texture of coal.Be in workplace mining influence stress in coal bed state variation and coal-bed gas seepage field and distributed areas, temperature field shift and change, and all will significantly impact the mechanical property of coal.Therefore design a kind of CT scan technology of rationally utilizing, realize in the laboratory in the excavation unloading of simulation coal seam, the gas migration process that the damage of coal body microscopical structure is developed and extracted relevant information is the subject matter that the present invention will solve.
Summary of the invention
The present invention seeks to invent a kind of coal petrography multiple physical field coupling proving installation; This device is pressing close to rationally to utilize under the working condition CT scan technology as far as possible; Can test coal-gas train under temperature field, seepage field and stress field coupling; Coal body microscopical structure change procedure satisfies the acquisition function of many physical parameters data in coal-gas system change process.
A kind of coal petrography multiple physical field coupling proving installation is characterized in that it forms an airtight cylindrical shell by top cover, cylindrical shell and chassis; Be provided with the post chamber in the said top cover, a plunger that is used for the coal test specimen is applied axle pressure is installed in the post chamber, at four head tanks of barrel symmetric arrangement, each head tank inside all is provided with an air bag and a convex rubber piston; Four air bags are equipped with the gas line that is connected with the external high pressure source of the gas; Be provided with the gas line that is used for to the cylindrical shell inflation in the plunger; The two ends of said rubber piston are provided with hole, and calibrate AE sensor is installed in the hole, and the FPDP that the lead of calibrate AE sensor connects on the chassis is transferred to external acoustic emission acquisition system; Establish exhausr port on the said chassis, emptying valve is installed on the exhausr port, and connect gas differential pressure transmitter, mass-flow gas meter and gas data Acquisition Instrument; Arrange heating wire in the chassis; In addition, in top cover, be provided with temperature sensor; Top cover and chassis outside surface are provided with heat-insulation layer.
Head tank in above-described cylindrical shell and the cylindrical shell adopts in the time of can satisfying CT scan the x ray to penetrate the coal test specimen to require, have again enough rigidity to satisfy the carbon fibre material of mechanical test.
In order to make plunger can compensate the out-of-balance force that confined pressure raises and causes in the cylindrical shell voluntarily, the structure of above-mentioned plunger becomes the diameter circle cylinder by three of upper, middle and lower to be formed, and plunger stage casing diameter is greater than epimere and hypomere diameter.Wherein, the cross-sectional area of plunger hypomere equals the stage casing sectional area and deducts remaining annular cross-sectional area behind the epimere sectional area, and the stage casing part forms piston in the post chamber, make the post chamber form upper and lower two annuluses, ring cavity and following ring cavity on the abbreviation; The lower diameter in post chamber and upper diameter cooperate with the hypomere diameter and the epimere diameter of plunger respectively; The plunger axis position is provided with the gas line that is communicated with the cylinder lumen and second high-pressure air source; On right cylinder, be provided with the airway that cylindrical hypomere bottom surface is communicated with last ring cavity, this airway is communicated with the inner chamber and the last ring cavity of cylindrical shell; In addition, also have pipeline to run through plunger stage casing and hypomere, be communicated with cylinder lumen and last ring cavity.
For the ease of installing, top cover upper prop chamber diameter and plunger stage casing equal diameters, behind the plunger of packing on top, post chamber ring set of installation.After plunger is inserted top cover post chamber, a ring set is nested in the plunger epimere, and is fixed on top cover upper prop chamber.
In order to guarantee the impermeability of top cover and plunger, on plunger middle part, ring set and lower prop chamber wall, be provided with O-ring seal.
The method of application of above-mentioned coal petrography multiple physical field coupling proving installation is:
The first step: coal cinder is processed into design size, and surface smoothness meets the rectangular parallelepiped test specimen of ISRM's proposed standard; Paste foil gauge and temperature compensation sheet along parallel, vertical coal test specimen axis direction on its surface respectively, the foil gauge lead is connected to the chassis-date interface, forms this electric bridge of 1/4 Huitong with peripheral hardware strain data Acquisition Instrument; The coal test specimen is placed in the center on chassis, seal group cartridge chassis and cylindrical shell;
Second step: connect temperature sensor and temperature display watch in the top cover, the top cover temperature sensor is installed, its lead is connected external temperature indicator; Respectively four air bags are inserted in the head tank; The pipeline of peripheral hardware source of the gas passes top cover and connects each air bag; Advance in the head tank the rubber piston protruding end is nested, and contact with the air bag of inside; Again calibrate AE sensor is installed in the hole at each convex rubber piston two ends; At last with four head tank symmetrical placement between coal test specimen and cylindrical shell;
The 3rd step: be tightly connected top cover and cylindrical shell are connected to hydraulic hand-pump with plunger; And at top cover and chassis outer wrap heat-insulation layer;
The 4th step: device is fixed on the CT scan platform; At first along the coal test specimen axis full-scale CT scan that carries out from bottom to top; The writing scan data;
And then, open acoustic emission system and strain acquisition system simultaneously to giving chassis heating wire energising, gather monitoring coal test piece deformation amount and acoustic emission activity situation thereof in real time;
When top cover temperature sensor displays temperature value equated with the chassis temperature, coal test specimen temperature reached setting value; According to coal test specimen cubic deformation situation, again the coal test specimen is carried out the CT full-size scanning; The writing scan data;
The 5th step: open the high pressure peripheral hardware source of the gas of cylindrical shell, make and close high-pressure air source after reaching setting value with reference to cylinder pressure through regulating reduction valve, treat that gas in the jar is in stable condition after, will inject cylindrical shell with reference to gas in the jar; After after a while,, explain that the coal test specimen has been in the adsorption equilibrium state when coal test specimen cubic deformation amount and gaseous tension transmitter monitor after cylindrical shell internal gas pressure value changes balance and stability;
The 6th step: open the high-pressure air source that connects air bag simultaneously, regulate reduction valve and give two groups of air bag gas injections respectively, promote the convex rubber piston after the air bag dilatational strain coal test specimen is applied two pairs of unequal intermediate principal stresses and least principal stress;
Keeping under the constant situation of gasbag pressure, the manual adjustments hydraulic pump adopts the step load mode, and the coal test specimen is applied axial stress; After treating that coal test piece deformation and cylindrical shell gas pressure change are stable, the coal test specimen is carried out full-scale CT scan; The writing scan data;
The 7th step: according to the different tests test request, under different stress levels and temperature conditions, open emptying valve, discharge gas in the cylindrical shell; Gas differential pressure transmitter and mass-flow gas meter real time record gaseous emission process in this process.
Central idea of the present invention is the geologic condition according to resample area; Coal test specimen after the adsorption gas balance is applied the three-dimensional stress and the temperature of corresponding coal seam reservoirs; Make it return to original occurrence status; Through changing the stress state simulation excavation uninstall process of coal test specimen, the grand microscopical structure change information of real time record coal body.
This proving installation not only can be recorded in real time at coal test piece deformation and acoustic emission activity thereof under different temperatures, the stress state, can also carry out that coal-aspiration attaches and desorption process, and with the coal test specimen microscopical structure characteristic of CT technology quantitative visualization.Be particularly useful for the simulation excavation to country rock body damage process.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the A-A view of Fig. 1.
Fig. 3 is barrel 1/4 a structural upright synoptic diagram of the present invention.
Among the figure: 1-coal test specimen; The 2-foil gauge; The 3-rubber piston; The 4-heating wire; The 5-cylindrical shell; The 6-head tank; The 7-calibrate AE sensor; The 8-air bag; The 9-chassis; The 10-mass-flow gas meter; The 11-air valve; 12-gas differential pressure transmitter; The 13-temperature controller; 14-first high-pressure air source; The 15-reduction valve; The 16-plunger; 17-gas reference cylinder; 18-second high-pressure air source; The 19-temperature sensor; The 20-temperature display watch, 21-strain data Acquisition Instrument; 22-acoustic emission acquisition system; The 23-heat-insulation layer; 24-the 3rd high-pressure air source; The 25-top cover; The 26-support; 27-gas data Acquisition Instrument; The 28-ring set; The 29-O-ring seal.
Embodiment
A kind of coal petrography multiple physical field coupling proving installation as shown in Figure 1, it forms an airtight cylindrical shell by top cover 25, cylindrical shell 5 and chassis 9; Be provided with the post chamber in the said top cover 25, a plunger 16 that is used for the coal test specimen is applied axle pressure is installed in the post chamber, at four head tanks 6 of cylindrical shell 5 inner symmetric arrangement, each head tank 6 inside all is provided with an air bag 8 and a convex rubber piston 3; Each air bag 8 is equipped with the gas line that is connected with the external high pressure source of the gas, and wherein symmetrical air bag 8 connects the 3rd high-pressure air source 24, and the air bag 8 of front and back symmetry connects first high-pressure air source 14, and the source of the gas top hole pressure is by reduction valve 15 controls, and is as shown in Figure 2; Be provided with the gas line that is used for to cylindrical shell 5 inner chamber gas injections in the plunger 16, this gas line be communicated with extraneous gas with reference to the cylinder 17 and second high-pressure air source 18; The two ends of said rubber piston 3 are provided with circular opening, and calibrate AE sensor 7 is installed in the hole, and the lead of calibrate AE sensor 7 is connected to the FPDP on chassis 9, and the acoustic emission data transmission is arrived external acoustic emission acquisition system 22; Emptying valve 11 is installed on the exhausr port on said chassis 9, and is connected gas differential pressure transmitter 12, mass-flow gas meter 10 and gas data Acquisition Instrument 27; Also be furnished with heating wire 4 in the chassis 9, heating wire 4 connects external temperature controller 13; In addition, in top cover 25, be provided with temperature sensor 19, temperature sensor 19 connects external temperature display watch 20; Top cover 25 is provided with heat-insulation layer 23 with chassis 9 outside surfaces.
In order to make plunger 16 can compensate the out-of-balance force that confined pressure raises and causes in the cylindrical shell voluntarily, the structure of above-mentioned plunger 16 becomes the diameter circle cylinder by three of upper, middle and lower to be formed, and plunger stage casing diameter is greater than epimere and hypomere diameter.Wherein, the cross-sectional area of plunger 16 hypomeres equals the stage casing sectional area and deducts remaining annular cross-sectional area behind the epimere sectional area, and the stage casing part forms piston in the post chamber, make the post chamber form upper and lower two annuluses, ring cavity and following ring cavity on the abbreviation; The lower diameter in post chamber and upper diameter cooperate with the hypomere diameter and the epimere diameter of plunger 16 respectively; Plunger 16 axial location are provided with the gas line that is communicated with cylindrical shell 5 inner chambers and second high-pressure air source 18; On right cylinder, be provided with the airway that cylindrical hypomere bottom surface is communicated with last ring cavity, this airway is communicated with the inner chamber and the last ring cavity of cylindrical shell 5; In addition, also have pipeline to run through plunger 16 stage casings and hypomere, be communicated with cylindrical shell 5 inner chambers and last ring cavity.When second high-pressure air source 18 in cylindrical shell 5 during gas injection; Gas pressure intensity equates in cylindrical shell 5 inner chambers and the last ring cavity; Equate with its top, stage casing annular cross-sectional area owing to plunger 16 hypomere sectional areas again; Guarantee that plunger 16 is in the stress balance state, the rising of cylindrical shell 5 internal gas pressures neither can occur plunger 16 is ejected cylindrical shell 5, satisfy that also coal test specimen 1 is applied axle pressure; When applying axle pressure, connect hydraulic hand-pump on plunger 16 tops, plunger 16 bottom surfaces contact on coal test specimen 1 top.
For the ease of installing, with the lower prop chamber of plunger 16 hypomeres embedding top cover 25, a ring set 28 is installed at plunger 16 epimeres, sealing and fixing is wall in the upper prop chamber of top cover 25.
In order to guarantee the impermeability of top cover 25, piston 16 stage casings and up and down ring cavity be equipped with O-ring seal 29.
From figure, find out that this proving installation also is provided with support 26, when transverse horizontal is placed on the CT scanner, play a supportive role.
Above-described cylindrical shell 5 should adopt with head tank 6 in the cylindrical shell that the x ray penetrates the coal test specimen, has enough rigidity to meet mechanical test requirement, for example carbon fibre material again in the time of can satisfying CT scan.
The method of application of above-mentioned coal petrography multiple physical field coupling proving installation is:
The first step: coal cinder is processed into that size is suitable, surfacing, meets the rectangular parallelepiped test specimen that ISRM is recommended.Paste foil gauge 2 and temperature compensation sheet along parallel, vertical coal test specimen 1 axis direction on its surface respectively, the foil gauge lead connects peripheral hardware strain data Acquisition Instrument 21 through the chassis-date interface and forms this electric bridge of 1/4 Huitong.Coal test specimen 1 is placed in the center on chassis 9, and assemble chassis 9 and cylindrical shell 5 are guaranteed the connecting portion good seal.
Second step: the temperature sensor 19 of connection top cover is connected to external temp indicator gauge 20 with its lead.Respectively four air bags 8 are inserted in the head tank 6.The pipeline of first high-pressure air source 14 passes top cover 25 and connects each air bag 8.Advance in the head tank 6 rubber piston 3 is nested, and contact, again calibrate AE sensor 7 is installed in the hole at each convex rubber piston 3 two ends with the air bag 8 of inside.At last with four head tank 6 symmetrical placement between coal test specimen 1 and cylindrical shell 5.
The 3rd step: be tightly connected top cover 25 and cylindrical shell 5 are connected to hydraulic hand-pump with plunger 16;
The 4th step: after above-mentioned component-assembled finishes, at top cover 25 and chassis 9 outer wrap heat-insulation layers 23.Device is fixed on the CT scan platform.At first coal test specimen 1 is carried out full-scale CT scan from bottom to top; And then, open acoustic emission acquisition system 22 and strain data Acquisition Instrument 21 simultaneously to heating wire 4 energisings, gather monitoring coal test specimen 1 (thermal expansion) deflection and its acoustic emission activity in real time; When temperature sensor 19 displays temperature values are identical with temperature controller 13 temperature, can think that the coal test specimen 1 of this moment reaches setting value.According to coal test specimen 1 cubic deformation different phase, again it is carried out the CT full-size scanning.
The 5th step: close emptying valve 11, open second high-pressure air source 18, regulate and close second high-pressure air source 18 after reduction valve 15 makes gas reference cylinder 17 interior gaseous tensions reach setting value.Gas reference cylinder 17 gases are injected cylindrical shell 5 inner chambers through plunger 16 gut lines.After coal test specimen 1 cubic deformation amount and gas differential pressure transmitter 12 monitor cylindrical shell internal gas pressure value stabilization, can think that coal test specimen 1 has been in the adsorption equilibrium state.
The 6th step: open first high-pressure air source 14 and the 3rd high-pressure air source 24 simultaneously; Regulate reduction valve 15 and give two groups of air bag 8 gas injections respectively, promote 3 pairs of coal test specimens 1 of convex rubber piston after air bag 8 dilatational straiies and apply two pairs of unequal intermediate principal stresses and least principal stress according to setting value.Keep air bag 8 pressure constant, the manual adjustments hydraulic pump adopts the step load mode, and coal test specimen 1 is applied axial stress.After treating that 1 distortion of coal test specimen and cylindrical shell 5 gas pressure change are stable, coal test specimen 1 is carried out full-scale CT scan.
The 7th step: according to test request; Can under different stress levels and temperature conditions, open emptying valve 11; Discharge cylindrical shell 5 and coal test specimen 1 internal gas, gas differential pressure transmitter 12 is gathered gaseous tension and data on flows in the stress-relief process in real time with mass-flow gas meter 10.
Claims (5)
1. a coal petrography multiple physical field coupling proving installation is characterized in that it forms an airtight cylindrical shell by top cover, cylindrical shell and chassis; Wherein: be provided with the post chamber in the said top cover, a plunger that is used for the coal test specimen is applied axle pressure is installed in the post chamber, at four head tanks of barrel symmetric arrangement, each head tank inside all is provided with an air bag and a convex rubber piston; Four air bags are equipped with the gas line that is connected with the external high pressure source of the gas; Be provided with the gas line that is used for to the cylindrical shell inflation in the plunger; The two ends of said rubber piston are provided with hole, and calibrate AE sensor is installed in the hole, and the FPDP that the lead of calibrate AE sensor connects on the chassis is transferred to external acoustic emission acquisition system; Establish exhausr port on the said chassis, emptying valve is installed on the exhausr port, and connect gas differential pressure transmitter, mass-flow gas meter and gas data Acquisition Instrument; Arrange heating wire in the chassis; In addition, in top cover, be provided with temperature sensor; Top cover and chassis outside surface are provided with heat-insulation layer;
Head tank in above-mentioned cylindrical shell and the cylindrical shell adopts in the time of can satisfying CT scan the x ray to penetrate the coal test specimen to require, have again enough rigidity to satisfy the carbon fibre material of mechanical test.
2. coal petrography multiple physical field coupling proving installation as claimed in claim 1 is characterized in that, the structure of above-mentioned plunger becomes the diameter circle cylinder by three of upper, middle and lower to be formed, and plunger stage casing diameter is greater than epimere and hypomere diameter; Wherein, the cross-sectional area of plunger hypomere equals the stage casing sectional area and deducts remaining annular cross-sectional area behind the epimere sectional area, and the stage casing part forms piston in the post chamber, make the post chamber form upper and lower two annuluses, ring cavity and following ring cavity on the abbreviation; The lower diameter in post chamber and upper diameter cooperate with the hypomere diameter and the epimere diameter of plunger respectively; The plunger axis position is provided with the gas line that is communicated with the cylinder lumen and second high-pressure air source; On right cylinder, be provided with the airway that cylindrical hypomere bottom surface is communicated with last ring cavity, this airway is communicated with the inner chamber and the last ring cavity of cylindrical shell; In addition, also have pipeline to run through plunger stage casing and hypomere, be communicated with cylinder lumen and last ring cavity.
3. coal petrography multiple physical field coupling proving installation as claimed in claim 2 is characterized in that, top cover upper prop chamber diameter and plunger stage casing equal diameters are installed a ring set on top, post chamber behind the plunger of packing into; After plunger is inserted top cover post chamber, a ring set is nested in the plunger epimere, and is fixed on top cover upper prop chamber.
4. coal petrography multiple physical field coupling proving installation as claimed in claim 3 is characterized in that, on plunger middle part, ring set and lower prop chamber wall, is equipped with O-ring seal.
5. like the method for application of the arbitrary described proving installation of claim 1-4, it is characterized in that,
The first step: coal cinder is processed into design size, and surface smoothness meets the rectangular parallelepiped test specimen of ISRM's proposed standard; Paste foil gauge and temperature compensation sheet along parallel, vertical coal test specimen axis direction on its surface respectively, the foil gauge lead is connected to the chassis-date interface, forms this electric bridge of 1/4 Huitong with peripheral hardware strain data Acquisition Instrument; The coal test specimen is placed in the center on chassis, seal group cartridge chassis and cylindrical shell;
Second step: connect temperature sensor and temperature display watch in the top cover, the top cover temperature sensor is installed, its lead is connected external temperature indicator; Respectively four air bags are inserted in the head tank; The pipeline of peripheral hardware source of the gas passes top cover and connects each air bag; Advance in the head tank the rubber piston protruding end is nested, and contact with the air bag of inside; Again calibrate AE sensor is installed in the hole at each convex rubber piston two ends; At last with four head tank symmetrical placement between coal test specimen and cylindrical shell;
The 3rd step: be tightly connected top cover and cylindrical shell are connected to hydraulic hand-pump with plunger; And at top cover and chassis outer wrap heat-insulation layer;
The 4th step: device is fixed on the CT scan platform; At first along the coal test specimen axis full-scale CT scan that carries out from bottom to top; The writing scan data;
And then, open acoustic emission system and strain acquisition system simultaneously to giving chassis heating wire energising, gather monitoring coal test piece deformation amount and acoustic emission activity situation thereof in real time;
When top cover temperature sensor displays temperature value equated with the chassis temperature, coal test specimen temperature reached setting value; According to coal test specimen cubic deformation situation, again the coal test specimen is carried out the CT full-size scanning; The writing scan data;
The 5th step: open the high pressure peripheral hardware source of the gas of cylindrical shell, make and close high-pressure air source after reaching setting value with reference to cylinder pressure through regulating reduction valve, treat that gas in the jar is in stable condition after, will inject cylindrical shell with reference to gas in the jar; After after a while,, explain that the coal test specimen has been in the adsorption equilibrium state when coal test specimen cubic deformation amount and gaseous tension transmitter monitor after cylindrical shell internal gas pressure value changes balance and stability;
The 6th step: open the high-pressure air source that connects air bag simultaneously, regulate reduction valve and give two groups of air bag gas injections respectively, promote the convex rubber piston after the air bag dilatational strain coal test specimen is applied two pairs of unequal intermediate principal stresses and least principal stress;
Keeping under the constant situation of gasbag pressure, the manual adjustments hydraulic pump adopts the step load mode, and the coal test specimen is applied axial stress; After treating that coal test piece deformation and cylindrical shell gas pressure change are stable, the coal test specimen is carried out full-scale CT scan; The writing scan data;
The 7th step: according to the different tests test request, under different stress levels and temperature conditions, open emptying valve, discharge gas in the cylindrical shell; Gas differential pressure transmitter and mass-flow gas meter real time record gaseous emission process in this process.
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