CN103412093B - Triaxial one-time coal and gas outburst test method - Google Patents

Triaxial one-time coal and gas outburst test method Download PDF

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Publication number
CN103412093B
CN103412093B CN201310375267.4A CN201310375267A CN103412093B CN 103412093 B CN103412093 B CN 103412093B CN 201310375267 A CN201310375267 A CN 201310375267A CN 103412093 B CN103412093 B CN 103412093B
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China
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pressure chamber
cover
sleeve
test specimen
raw coal
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CN103412093A (en
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姜德义
陈结
李林
任松
袁曦
蒋翔
王雷
易亮
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Chongqing University
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Chongqing University
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Abstract

The invention discloses a triaxial one-time coal and gas outburst test method. The method comprises the following steps of: 1) installing a telescopic steel sleeve provided with a raw coal test specimen between a confining pressure cavity upper cover and a lower bearing plate; 2) placing various sensors in the telescopic steel sleeve; 3) arranging a sealing aluminium sheet I on a sealing taper sleeve; 4) installing a primary pressure chamber at the top of a main pressure chamber; 5) monitoring variations of stresses, temperatures and gas pressures of the raw coal test specimen before and after tests; 6) pressurizing the test specimen in the main pressure chamber; 7) evacuating air inside a rubber sleeve of the main pressure chamber; 8) filling gases into the raw coal test specimen in the main pressure chamber and the primary pressure chamber; and 9) piercing the sealing aluminium sheet I with a piercing tool, and enabling the raw coal test specimen in the rubber sleeve and the gases to carry out one-time outburst. By adopting the test method, raw coal in different sizes can be adopted to carry out coal and gas outburst test in the triaxial stress state to study the coal and gas outburst occurrence principles more comprehensively and scientifically.

Description

Three axle coal and non-coal are outstanding test method once
Technical field
The present invention relates to a kind of coal and gas prominent test method, particularly relate to a kind of three axle coal and non-coal once outstanding test method.
Background technology
Coal and gas prominent is a kind of extremely complicated dynamic phenomenon of underground coal mine, and it seriously threatens Safety of Coal Mine Production, affects the performance of coal production ability.At driving face, particularly often coal and non-coal postponing bursting occurs in stone door punching coal process, it is the coal and gas prominent that after explosion or operation, a period of time inherent explosion or operation place occur.Steeply pitching seam etc. first time outstanding occur after also once occurred secondary outstanding or even three times outstanding.According to incompletely statistics; there is a few percent that postponing bursting number of times accounts for total outstanding number of times in the whole nation; although proportion is little; but because " extension ", this kind of giving prominence to often exceeds the unexpected of people, the defer time of postponing bursting; without certain rule; short then a few minutes, long then tens hours, even several days; Secondary is given prominence to and is also often occurred in the scale removal process after giving prominence to for the first time; If outstanding time, just in time run into workplace have people to carry out operation or outstanding to last time after clearing up, personnel can not withdraw in time, very harmful to miner, and cause great casualties and property loss, mine safety production in serious threat.The mechanism that coal and gas prominent occurs and form are complicated, along with the increase of coal mining depth and mining conditions day by day complicated, the generation of coal and gas prominent is also difficult to prediction more, at present, the study mechanism of Chinese scholars to coal and gas prominent makes certain gains, but most achievement is all the hypothesis that field statistics data and laboratory study propose.These hypothesis all can only be described a part of phenomenon of certain of coal and gas prominent, can't form the complete Principle System of quantification.Utilize existing hypothesis to predict very large difficulty to coal and gas prominent, and accuracy is not high, this just brings huge hidden danger to mine safety production.
At present, mainly there is following problem in the device carrying out coal and gas prominent test: the test specimen that (1) adopts mostly is moulded coal, although moulded coal has similarity with raw coal to a certain extent, still there is larger difference in both, and the research to coal and gas prominent mechanism has certain limitation; (2) part moulded coal sample dimensions is comparatively large, and the test preparatory period is longer; (3) device is installed comparatively complicated; (4) device can only produce and once give prominence to, and can not reflect down-hole coal and gas prominent phenomenon really; (5) aspis opening speed is comparatively slow, have impact on the time of coal and gas prominent to a certain extent, can not close to field condition.
Summary of the invention
For above shortcomings in prior art, the invention provides a kind of three axle coal and non-coal once outstanding test method.This test method can reach the effect of quick pressure releasing, and can produce the phenomenon of coal and non-coal once outstanding or coal and non-coal delay outburst, thus the mechanism that coal and gas prominent occurs is carried out more comprehensively, more scientific research.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
Three axle coal and non-coal are outstanding test method once, have employed a kind of main pressure chamber and first time pressure chamber in this test method;
This main pressure chamber comprise confined pressure room base, steel cylinder, confined pressure chamber upper cover, aspis seal taper sleeve, sealing aluminium flake I, sealing plug I, elevating screw, can drive elevating screw rise or decline driving mechanism, load sensor, lower bearing plate and confined pressure piston; Described steel cylinder is placed on the base of confined pressure room, arranges confined pressure O-ring seal between described confined pressure chamber upper cover and steel cylinder, and confined pressure chamber upper cover is pressed on steel cylinder by pull bar; Described lower bearing plate to be arranged in steel cylinder and to be slidably matched with the inwall of steel cylinder, described elevating screw is vertically arranged on the below of lower bearing plate and withstands on lower bearing plate by load sensor, the tapered structure in top of described lower bearing plate, described confined pressure piston bush is on the top of lower bearing plate and be sealed and matched with lower bearing plate, and described confined pressure piston coordinates with the inner wall sealing of steel cylinder; The middle part of described confined pressure chamber upper cover is large conical hollow structure suitable for reading, is sealed and matched in the bell that described aspis seal taper sleeve is pressed in confined pressure chamber upper cover with confined pressure chamber upper cover;
Described first time pressure chamber comprise pressure chamber's sleeve, spring lock shotpin, puncture cutter, energy-storaging spring seat, energy-storaging spring, top cover, sealing aluminium flake II and sealing plug II; Described pressure chamber sleeve be circumferentially laid with at least two through holes, be provided with one in each through hole and put in spring lock shotpin in pressure chamber's sleeve, described spring lock shotpin and through hole slide and are sealed and matched; Described energy-storaging spring seat is hollow structure, energy-storaging spring seat to be located in pressure chamber's sleeve and to be slidably matched with the inwall of pressure chamber's sleeve, described top cover is hollow structure and is arranged on the top of pressure chamber's sleeve, top cover coordinates with pressure chamber's sleeve seal, one end of described energy-storaging spring is pressed on energy-storaging spring seat, the other end of energy-storaging spring is pressed on top cover, and described energy-storaging spring seat is pressed on spring lock shotpin; The described cutter that punctures is hollow structure, punctures cutter and is arranged on below the middle part of energy-storaging spring seat; Described sealing aluminium flake II is arranged in the hollow hole of top cover, and sealing plug II to screw in the hollow hole of top cover and is pressed on sealing aluminium flake II;
This test method comprises the steps:
1) extract raw coal test specimen, to be contained in by raw coal test specimen in flexible steel bushing and to be fixed by flexible steel bushing, flexible steel bushing is arranged between confined pressure chamber upper cover in main pressure chamber and lower bearing plate, then is enclosed within gum cover that flexible steel bushing is outer to be sealed raw coal test specimen;
2) laying temperature sensor, pressure transducer, shaft position sensor and radial extensometer in flexible steel bushing;
3) described sealing aluminium flake is arranged on aspis seal taper sleeve, and described sealing plug I is hollow structure, and sealing plug I to screw in the upper port of confined pressure chamber upper cover and is pressed on sealing aluminium flake I, and sealing aluminium flake I is sealed and matched with aspis seal taper sleeve;
4) at the top of main pressure chamber, first time pressure chamber is installed, pressure chamber's sleeve of first time pressure chamber is coordinated with the top seal of confined pressure chamber upper cover, the sealing aluminium flake I punctured in bit alignment main pressure chamber for the first time in pressure chamber;
5) start Data Control and acquisition system, the change of the stress of raw coal test specimen, temperature and gaseous tension before and after monitoring test, and it is gathered;
6) the raw coal test specimen in main pressure chamber is pressurizeed, to water filling between flexible steel bushing and steel cylinder, confined pressure is applied to the raw coal test specimen in flexible steel bushing; By elevating screw, axial compression is applied to the raw coal test specimen in flexible steel bushing;
7) carrying out emptying to the air of main pressure chamber's gum cover inside, taking out the air of main pressure chamber's gum cover inside with vacuum pump when keeping axial compression and confined pressure is constant, until gaseous tension is lower than 10Pa;
8) when keeping axial compression and confined pressure constant, being filled with methane gas respectively to the raw coal test specimen in main pressure chamber with for the first time in pressure chamber, making the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with methane gas and must ensure more than 48h; And first time pressure chamber in gaseous tension will lower than the gaseous tension of the gum cover inside of main pressure chamber;
9) cutter that punctures in first time pressure chamber punctures sealing aluminium flake I in main pressure chamber; Raw coal test specimen in gum cover and methane gas occur once to give prominence to; Real-Time Monitoring and collection are carried out to each data in whole experimentation.
Compared with prior art, three axle coal and non-coal of the present invention once outstanding test method tool have the following advantages:
1, this test method can reach the effect of quick pressure releasing, and can produce the phenomenon of coal and gas prominent or coal and non-coal delay outburst, thus to coal and gas prominent occur mechanism carry out more comprehensively, more scientific research.
2, this test method can monitor the gas pressure of raw coal body in outstanding front and back, stress-strain state and temperature variations, to reach the target being familiar with coal and gas prominent mechanism under various factors effect; Because adopt raw coal to test in test, result more tallies with the actual situation, and can better disclose the effect of various factors.
3, this test method can realize once giving prominence to and test with postponing bursting, for this kind of special and outstanding situation that the extent of injury is large prevent basis is provided.That brings out in various degree by regulating the pressure differential of each pressure chamber is outstanding.The destruction of outstanding process to coal body can be familiar with, layering soft in coal seam and outstanding coal study on the genesis are provided support; For the degree of impairment of coal body under outstanding role and the research of micro-damage state provide basis.So that the mechanism that more scientific research coal and gas prominent produces, that form science, perfect theory, for the control of colliery to coal and gas prominent is provided fundamental basis.
Accompanying drawing explanation
Fig. 1 is the left view that three axle coal and non-coal once give prominence to test unit;
Fig. 2 is the front view that three axle coal and non-coal once give prominence to test unit;
Fig. 3 is the structural representation of main pressure chamber;
Fig. 4 is the structural representation of main pressure chamber's top seal;
Fig. 5 is the structural representation of main pressure chamber's lower seal;
Fig. 6 is the cross section view of first time pressure chamber;
Fig. 7 is the vertical view of first time pressure chamber.
In accompanying drawing: 1-elevating screw; 2-load sensor; 3-gas inlet pipe; 4-lower bearing plate; 5-confined pressure piston; 6-confined pressure O-ring seal; 7-cable sealed joint; 8-radial extensometer; 9-flexible steel bushing; 10-built-in foil gauge; 11-gum cover; 12-aspis seal taper sleeve; 13-O-ring seal; 14-sealing aluminium flake; 15-sealing plug; 16-aspis baroceptor; 17-vent valve; 18-confined pressure chamber upper cover; 19-confined pressure O-ring seal; 20-steel cylinder; 21-protection network; 22-pull bar; 23-pressing plate is installed; 24-confined pressure room base; 25-confined pressure penstocks; 26-vacuumize tracheae; 27-gas air intake duct; 28-press water inlet channel; 29-main pressure chamber; 30-pressure chamber for the first time; 32-pressure chamber sleeve; 33-spring lock shotpin; 34-puncture cutter; 35-energy-storaging spring seat; 36-energy-storaging spring; 37-top cover; 38-sealing aluminium flake II; 39-sealing plug; 40-frame; 41-bearing; 42-column; 43-moving beam; 44-moving beam drive motor; 45-reducer of turbodrill; 46-tape displacement transducer; 47-lock pin O-ring seal; 48-O-ring seal; 49-screw; 50-tractive magnet; 51-tooth bar; 52-orienting sleeve; 53-tooth bar reset components; 54-gear and cam mechanism; 55-guard shield; 56-guard shield lock-screw; 57-back-moving spring.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Three axle coal and non-coal are outstanding test method once, in this test method, have employed a kind of test unit, as shown in Figure 1, 2, test unit comprise frame 40, bearing 41, main pressure chamber 29 and first time pressure chamber 30.Bearing 41 is arranged in frame 40, vertically arranges column 42 respectively in the both sides of frame 40, arranges a moving beam 43 and moving beam drive motor 44 between two columns 42, and moving beam 43 and column 42 are slidably matched.
The structure of main pressure chamber is as shown in Fig. 3,4 and 5, this main pressure chamber 29 comprises confined pressure room base 24, steel cylinder 20, confined pressure chamber upper cover 18, aspis seal taper sleeve 12, sealing aluminium flake I 14, sealing plug I 15, elevating screw 1, the driving mechanism that elevating screw 1 can be driven to rise or decline, load sensor 2, lower bearing plate 4 and confined pressure piston 5.Confined pressure room base 24 is arranged in frame 40 by installing pressing plate 23, steel cylinder 20 is placed on confined pressure room base 24, arrange confined pressure O-ring seal 19 between confined pressure chamber upper cover 18 and steel cylinder 20, confined pressure chamber upper cover 18 is pressed on steel cylinder 20 by pull bar 22, arranges one deck protection network 21 outside steel cylinder 20.Lower bearing plate 4 to be arranged in steel cylinder 20 and to be slidably matched with the inwall of steel cylinder 20, and elevating screw 1 is vertically arranged on the below of lower bearing plate 4 and is withstood on lower bearing plate 4 by load sensor 2.The tapered structure in top of lower bearing plate 4, confined pressure piston 5 is enclosed within the top of lower bearing plate 4 and is sealed and matched by gum cover 11 and lower bearing plate 4, and the outer wall of confined pressure piston 5 is coordinated with the inner wall sealing of steel cylinder 20 by confined pressure O-ring seal 6.The middle part of confined pressure chamber upper cover 18 is large conical hollow structure suitable for reading, is sealed and matched in the bell that aspis seal taper sleeve 12 is pressed in confined pressure chamber upper cover 18, confined pressure chamber upper cover 18 is provided with vent valve 17 by gum cover 11 and confined pressure chamber upper cover 18.Gas air intake duct 27 and vacuum pumping air flue is provided with at the middle part of confined pressure piston 5 and lower bearing plate 4, gas air intake duct 27 is connected with gas inlet pipe 3, vacuum pumping air flue with vacuumize tracheae 26 and be connected, confined pressure piston 5 and lower bearing plate 4 keep to the side and be provided with press water inlet channel 28, and press water inlet channel 28 is connected with confined pressure penstocks 25.Elevating screw 1 is ball screw, driving mechanism comprises and is arranged on reducer of turbodrill 45 below elevating screw 1 and motor, parts such as driven by motor reducer of turbodrill 45 grade drive elevating screw 1 to move up or down, thus under promoting, bearing plate 4 moves up or down.Tape displacement transducer 46 is provided with in the below of reducer of turbodrill 45.
As shown in Figure 6,7, first time pressure chamber 30 comprise pressure chamber's sleeve 32, spring lock shotpin 33, puncture cutter 34, energy-storaging spring seat 35, energy-storaging spring 36, top cover 37, sealing aluminium flake II 38, sealing plug II 39 and lock pin driving mechanism.Pressure chamber's sleeve 32 be circumferentially laid with at least two through holes (in the present embodiment, pressure chamber's sleeve 32 be circumferentially laid with three through holes), be provided with one in each through hole and put in spring lock shotpin 33 in pressure chamber's sleeve 32, spring lock shotpin 33 is sealed and matched by lock pin O-ring seal 47 and through-hole wall, and spring lock shotpin 33 also can slide in through hole.Energy-storaging spring seat 35 is hollow structure, and energy-storaging spring seat 35 to be located in pressure chamber's sleeve 32 and to be slidably matched with the inwall of pressure chamber's sleeve 32.Top cover 37 is hollow structure and is arranged on the top of pressure chamber's sleeve 32 by screw 49, and top cover 37 coordinates with the top seal of pressure chamber's sleeve 32.One end of energy-storaging spring 36 is pressed on energy-storaging spring seat 35, and the other end of energy-storaging spring 36 is pressed on top cover 37, and energy-storaging spring seat 35 is pressed on spring lock shotpin 33.Puncture cutter 34 for hollow structure, puncturing cutter 34 is arranged on below the middle part of energy-storaging spring seat 35, in the present embodiment, punctures cutter 34 for hollow tube, one end of hollow tube is connected to below the middle part of energy-storaging spring seat 35 by ring flange, the other end of hollow tube is pyramidal structure.Sealing aluminium flake II 38 is arranged in the hollow hole of top cover 37, and sealing plug II 39 to screw in the hollow hole of top cover 37 and is pressed on sealing aluminium flake II 38, and sealing aluminium flake II 38 is sealed and matched by the inner hole wall of O-ring seal 48 with top cover 37.Lock pin driving mechanism comprises tractive magnet 50, tooth bar 51, orienting sleeve 52, tooth bar reset components 53, gear and cam mechanism 54, guard shield 55 and guard shield lock-screw 56.Tooth bar 51 is respectively equipped with an orienting sleeve 52 near two ends, tooth bar 51 and orienting sleeve 52 are slidably matched, one end of tooth bar 51 arranges tractive magnet 50, and this tractive magnet 50 slides on orienting sleeve 52 for driving tooth bar 51, arranges tooth bar reset components 53 at the other end of tooth bar 51.Wheel and rack 51 tooth engagement on gear and cam mechanism 54, cam slidably contacts with spring lock shotpin 33, in the process that cam rotates, cam can promote spring lock shotpin 33 and move in pressure chamber's sleeve 32, when cam disengages spring lock shotpin 33, under the effect of back-moving spring 57, spring lock shotpin 33 outwards movement.Guard shield 55 is set outside gear and cam mechanism 54, is connected by guard shield lock-screw 56 between guard shield 55.
This three axles coal and non-coal is outstanding test method once, comprises the steps:
1) the raw coal test specimen that diameter is 50 ~ 100mm is extracted, raw coal test specimen to be contained in flexible steel bushing 9 and to be fixed by flexible steel bushing 9, flexible steel bushing 9 is arranged between confined pressure chamber upper cover 18 in main pressure chamber 29 and lower bearing plate 4, then is enclosed within flexible steel bushing 9 with gum cover 11 and is sealed by raw coal test specimen outward.Gas air intake duct 27 and vacuum pumping air flue are communicated with raw coal test specimen, and in the present embodiment, vacuum pumping air flue is communicated with gas air intake duct 27.Make to form confined pressure chamber between gum cover 11 and steel cylinder 20, confined pressure chamber communicates with press water inlet channel 28, and vent valve 17 communicates with in confined pressure chamber.
2) in flexible steel bushing 9, laying temperature sensor, pressure transducer, built-in foil gauge 10(comprise shaft position sensor and radial extensometer 8), complete the connection of various lead-in wire.The lead-in wire of radial extensometer 8 is connected with the cable splice on confined pressure piston 5 by cable sealed joint 7.
3) sealing aluminium flake 14 is arranged on aspis seal taper sleeve 12, and sealing plug 15 to screw in the upper port of confined pressure chamber upper cover 18 and is pressed on sealing aluminium flake 14, and sealing aluminium flake 14 is sealed and matched by O-ring seal 13 and aspis seal taper sleeve 12.Endoporus near aspis seal taper sleeve 12 is provided with aspis baroceptor 16.
4) install first time pressure chamber 30 at the top of main pressure chamber 29, pressure chamber's sleeve 32 of first time pressure chamber 30 is coordinated with the top seal of confined pressure chamber upper cover 18, sealing aluminium flake I 14 in main pressure chamber 29 aimed at by the cutter 34 that punctures for the first time in pressure chamber 30.
5) start Data Control and acquisition system, the change of the stress of raw coal test specimen, temperature and gaseous tension before and after monitoring test, and it is gathered.
6) the raw coal test specimen in main pressure chamber is pressurizeed, by confined pressure penstocks 25 and press water inlet channel 28 to water filling in the confined pressure chamber between flexible steel bushing 9 and steel cylinder 20, confined pressure is applied to the raw coal test specimen in flexible steel bushing 9; By elevating screw 1, axial compression is applied to the raw coal test specimen in flexible steel bushing 9, axial compression and confined pressure are added to predetermined load.
7) carrying out emptying to the air of main pressure chamber's gum cover 11 inside, taking out the air of main pressure chamber's gum cover 11 inside by vacuumizing tracheae 26 and vacuum pumping air flue with vacuum pump when keeping axial compression and confined pressure is constant, until gaseous tension is lower than 10Pa.
8) when keeping axial compression and confined pressure is constant, methane gas is filled with to raw coal test specimen by gas inlet pipe 3 and gas air intake duct 27, in first time pressure chamber 30, be filled with methane gas, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with methane gas and must ensure more than 48h; And first time pressure chamber 30 in gaseous tension will lower than the gaseous tension of gum cover 11 inside of main pressure chamber 29.
9) cutter 34 that punctures in first time pressure chamber 30 punctures sealing aluminium flake I 14 in main pressure chamber 29; Raw coal test specimen in gum cover 11 and methane gas occur once to give prominence to; Real-Time Monitoring and collection are carried out to each data in whole experimentation.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (1)

1. three axle coal and non-coal once outstanding test method, is characterized in that, have employed a kind of main pressure chamber (29) and first time pressure chamber (30) in this test method;
This main pressure chamber (29) comprise confined pressure room base (24), steel cylinder (20), confined pressure chamber upper cover (18), aspis seal taper sleeve (12), sealing aluminium flake I (14), sealing plug I (15), elevating screw (1), can drive elevating screw (1) rise or decline driving mechanism, load sensor (2), lower bearing plate (4) and confined pressure piston (5); Described steel cylinder (20) is placed on confined pressure room base (24), arranges confined pressure O-ring seal (19) between described confined pressure chamber upper cover (18) and steel cylinder (20), and confined pressure chamber upper cover (18) is pressed on steel cylinder (20) by pull bar (22); Described lower bearing plate (4) to be arranged in steel cylinder (20) and to be slidably matched with the inwall of steel cylinder (20), described elevating screw (1) is vertically arranged on the below of lower bearing plate (4) and withstands on lower bearing plate (4) by load sensor (2), the tapered structure in top of described lower bearing plate (4), described confined pressure piston (5) is enclosed within the top of lower bearing plate (4) and is sealed and matched with lower bearing plate (4), and described confined pressure piston (5) coordinates with the inner wall sealing of steel cylinder (20); The middle part of described confined pressure chamber upper cover (18) is large conical hollow structure suitable for reading, is sealed and matched in the bell that described aspis seal taper sleeve (12) is pressed in confined pressure chamber upper cover (18) with confined pressure chamber upper cover (18);
Pressure chamber of described first time (30) comprises pressure chamber's sleeve (32), spring lock shotpin (33), punctures cutter (34), energy-storaging spring seat (35), energy-storaging spring (36), top cover (37), sealing aluminium flake II (38) and sealing plug II (39); Described pressure chamber sleeve (32) is circumferentially laid with at least two through holes, and be provided with one in each through hole and put in spring lock shotpin (33) in pressure chamber's sleeve (32), described spring lock shotpin (33) and through hole slide and be sealed and matched; Described energy-storaging spring seat (35) is hollow structure, energy-storaging spring seat (35) to be located in pressure chamber's sleeve (32) and to be slidably matched with the inwall of pressure chamber's sleeve (32), described top cover (37) is for hollow structure and be arranged on the top of pressure chamber's sleeve (32), top cover (37) and pressure chamber's sleeve (32) are sealed and matched, one end of described energy-storaging spring (36) is pressed on energy-storaging spring seat (35), the other end of energy-storaging spring (36) is pressed on top cover (37), and described energy-storaging spring seat (35) is pressed on spring lock shotpin (33); Described to puncture cutter (34) be hollow structure, punctures cutter (34) and be arranged on below the middle part of energy-storaging spring seat (35); Described sealing aluminium flake II (38) is arranged in the hollow hole of top cover (37), and sealing plug II (39) to screw in the hollow hole of top cover (37) and is pressed on sealing aluminium flake II (38);
This test method comprises the steps:
1) raw coal test specimen is extracted, raw coal test specimen is contained in flexible steel bushing (9) interior and fixing by flexible steel bushing (9), flexible steel bushing (9) is arranged between confined pressure chamber upper cover (18) in main pressure chamber and lower bearing plate (4), then uses gum cover (11) to be enclosed within flexible steel bushing (9) to be sealed by raw coal test specimen outward;
2) laying temperature sensor, pressure transducer, shaft position sensor and radial extensometer (8) in flexible steel bushing (9);
3) described sealing aluminium flake I (14) is arranged on aspis seal taper sleeve (12), described sealing plug I (15) is hollow structure, sealing plug I (15) to screw in the upper port in confined pressure chamber upper cover (18) and is pressed on sealing aluminium flake I (14), and sealing aluminium flake I (14) is sealed and matched with aspis seal taper sleeve (12);
4) at the top of main pressure chamber (29), be installed first time pressure chamber (30), pressure chamber's sleeve (32) of first time pressure chamber (30) is coordinated, the sealing aluminium flake I (14) punctured on cutter (34) aligning main pressure chamber (29) on first time pressure chamber (30) with the top seal in confined pressure chamber upper cover (18);
5) start Data Control and acquisition system, the change of the stress of raw coal test specimen, temperature and gaseous tension before and after monitoring test, and it is gathered;
6) the raw coal test specimen in main pressure chamber is pressurizeed, to water filling between flexible steel bushing (9) and steel cylinder (20), confined pressure is applied to the raw coal test specimen in flexible steel bushing (9); By elevating screw (1), axial compression is applied to the raw coal test specimen in flexible steel bushing (9);
7) inner to main pressure chamber's gum cover (11) air carries out emptying, takes out the inner air of main pressure chamber's gum cover (11), until gaseous tension is lower than 10Pa when keeping axial compression and confined pressure is constant with vacuum pump;
8) when keeping axial compression and confined pressure is constant, being filled with methane gas respectively to the raw coal test specimen in main pressure chamber with in first time pressure chamber (30), making the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with methane gas and must ensure more than 48h; And the gaseous tension in first time pressure chamber (30) will lower than the gaseous tension of the gum cover of main pressure chamber (29) (11) inside;
9) cutter (34) that punctures in first time pressure chamber (30) punctures sealing aluminium flake I (14) in main pressure chamber (29); Raw coal test specimen in gum cover (11) and methane gas occur once to give prominence to; Real-Time Monitoring and collection are carried out to each data in whole experimentation.
CN201310375267.4A 2013-08-26 2013-08-26 Triaxial one-time coal and gas outburst test method Expired - Fee Related CN103412093B (en)

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CN105891440B (en) * 2016-04-11 2017-12-01 辽宁工程技术大学 A kind of coal and gas prominent experimental rig and method for having supply source of the gas
CN106124380B (en) * 2016-06-22 2019-01-15 太原理工大学 The device and method of coal column gas permeability is measured in a kind of similarity simulation experiment
CN107515289B (en) * 2017-10-25 2020-03-17 辽宁工程技术大学 Coal and gas outburst simulation test device

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