CN103412093A - 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
CN103412093A
CN103412093A CN2013103752674A CN201310375267A CN103412093A CN 103412093 A CN103412093 A CN 103412093A CN 2013103752674 A CN2013103752674 A CN 2013103752674A CN 201310375267 A CN201310375267 A CN 201310375267A CN 103412093 A CN103412093 A CN 103412093A
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China
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pressure chamber
cover
sleeve
test specimen
raw coal
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CN2013103752674A
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CN103412093B (en
Inventor
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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Publication of CN103412093B publication Critical patent/CN103412093B/en
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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 coals and gas is outstanding test method once
Technical field
The present invention relates to a kind of coal and gas burst experiment method, particularly relate to once outstanding test method of a kind of three axle coals and gas.
Background technology
Coal and Gas Outburst are a kind of extremely complicated dynamic phenomenons under coal mine, and it is seriously threatening Safety of Coal Mine Production, affects the performance of coal production ability.At driving face, coal and gas particularly often occur in the stone door punching coal process delay outstandingly, it is coal and the Gas Outburst of inherent explosion of a period of time or operation place generation after explosion or operation.Steeply pitching seam etc. after outstanding generation for the first time, also once occurred secondary outstanding or even three times outstanding.According to incompletely statistics; a few percent that number of times accounts for total outstanding number of times occurs to delay to give prominence in the whole nation; although proportion is little; but because " extension ", outstanding the unexpected of people that often exceed of this class, the outstanding defer time of delaying; without certain rule; short a few minutes, long tens hours, even several days; In the outstanding scale removal process also often occurred in after giving prominence to for the first time of secondary; If when outstanding, just in time run into workplace have the people carry out operation or outstanding to last time after clearing up, personnel can not withdraw in time, very harmful to the miner caused great casualties and property loss, mine safety production in serious threat.Mechanism and form that coal and Gas Outburst occur are complicated, along with increase and the mining conditions of the coal mining degree of depth are day by day complicated, the generation of coal and Gas Outburst also is difficult to prediction more, at present, Chinese scholars makes certain gains to the mechanism research of coal and Gas Outburst, but most achievements are all the hypothesis that field statistics data and laboratory study propose.These hypothesis all can only be described certain a part of phenomenon of coal and Gas Outburst, can't form the complete Principle System of quantification.Utilize existing hypothesis to predict very large difficulty to coal and Gas Outburst, and accuracy is not high, this has just brought huge hidden danger to mine safety production.
At present, mainly there is following problem in the device that carries out coal and gas burst experiment: the test specimen that adopt (1) mostly is moulded coal, although moulded coal has similarity with raw coal to a certain extent, still there is larger difference in both, and certain limitation is arranged in the research to coal and gas outburst mechanism; (2) part moulded coal sample dimensions is larger, and the test preparatory period is longer; (3) device is installed comparatively complicated; (4) device can only produce once and give prominence to, and can not reflect really underground coal and Gas Outburst phenomenon; (5) the aspis opening speed is slower, has affected to a certain extent the time of coal and Gas Outburst, can not be near field condition.
Summary of the invention
For above shortcomings in prior art, the invention provides once outstanding test method of a kind of three axle coals and gas.This test method can reach the effect of quick pressure releasing, and can produce the once phenomenon of outstanding or coal and gas delay outburst of coal and gas, thus to the mechanism of coal and Gas Outburst generation carry out more comprehensively, more scientific research.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
Three axle coals and gas is outstanding test method once, in this test method, has adopted a kind of main pressure chamber and pressure chamber for the first time;
This main pressure chamber comprises confined pressure chamber base, steel cylinder, confined pressure chamber upper cover, aspis seal taper sleeve, sealing aluminium flake I, sealing plug I, elevating screw, can drive the driving mechanism that elevating screw rises or descends, load sensor, lower bearing plate and confined pressure piston; Described steel cylinder is placed on the base of confined pressure chamber, between described confined pressure chamber upper cover and steel cylinder, the confined pressure O-ring seal is set, and confined pressure chamber upper cover is pressed on steel cylinder by pull bar; Described lower bearing plate is arranged in steel cylinder and is slidably matched with the inwall of steel cylinder, described elevating screw vertically is arranged on the below of lower bearing plate and withstands on lower bearing plate by load sensor, the tapered structure in the 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 tapered hollow structure suitable for reading, and described aspis seal taper sleeve is pressed in the bell of confined pressure chamber upper cover and is sealed and matched with confined pressure chamber upper cover;
Described pressure chamber for the first time comprises pressure chamber's sleeve, spring lock shotpin, punctures cutter, energy-storaging spring seat, energy-storaging spring, top cover, sealing aluminium flake II and sealing plug II; On the circumference of described pressure chamber sleeve, be laid with at least two through holes, in each through hole, be provided with a spring lock shotpin put 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, the energy-storaging spring seat is located in pressure chamber's sleeve and is slidably matched with the inwall of pressure chamber's sleeve, described top cover is hollow structure the top that is arranged on pressure chamber's sleeve, top cover coordinates with pressure chamber's sleeve seal, one side pressure of described energy-storaging spring is on the 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 the spring lock shotpin; The described cutter that punctures is hollow structure, punctures the below, middle part that cutter is arranged on the energy-storaging spring seat; Described sealing aluminium flake II is arranged in the hollow hole of top cover, and the sealing plug II screws in the hollow hole of top cover and is pressed on sealing aluminium flake II;
This test method comprises the steps:
1) extract the raw coal test specimen, the raw coal test specimen is contained in flexible steel bushing and is fixed by flexible steel bushing, flexible steel bushing is arranged between the confined pressure chamber upper cover and lower bearing plate in main pressure chamber, then is enclosed within outside flexible steel bushing the raw coal test specimen is sealed with gum cover;
2) laying temperature sensor, pressure transducer, shaft position sensor and radial extensometer in flexible steel bushing;
3) described sealing aluminium flake is arranged on the aspis seal taper sleeve, and described sealing plug I is hollow structure, and the sealing plug I screws in the upper port of confined pressure chamber upper cover and is pressed on sealing aluminium flake I, and sealing aluminium flake I and aspis seal taper sleeve are sealed and matched;
4) at the top of main pressure chamber, pressure chamber for the first time is installed, pressure chamber's sleeve of pressure chamber is for the first time coordinated with the top seal of confined pressure chamber upper cover, in pressure chamber, puncture the sealing aluminium flake I in bit alignment main pressure chamber for the first time;
5) log-on data is controlled and acquisition system, the variation of stress, temperature and the gaseous tension of raw coal test specimen 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, the raw coal test specimen in flexible steel bushing is applied to confined pressure; By elevating screw, the raw coal test specimen in flexible steel bushing is applied to axial compression;
7) air of main pressure chamber's gum cover inside is carried out emptying, in the situation that keep axial compression and the constant air of taking out main pressure chamber's gum cover inside with vacuum pump of confined pressure, until gaseous tension is lower than 10Pa;
8) in the situation that keep axial compression and confined pressure constant, respectively to the raw coal test specimen in main pressure chamber with in pressure chamber, be filled with methane gas for the first time, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with more than methane gas must guarantee 48h; And the gaseous tension in pressure chamber will be lower than the gaseous tension of the gum cover inside of main pressure chamber for the first time;
9) cutter that punctures in pressure chamber punctures the sealing aluminium flake I in main pressure chamber for the first time; Raw coal test specimen in gum cover and methane gas occur once outstanding; Each data in whole experimentation are carried out to Real-Time Monitoring and collection.
Compared with prior art, three axle coals of the present invention and gas once outstanding test method have following advantage:
1, this test method can reach the effect of quick pressure releasing, and can produce the phenomenon of coal and Gas Outburst or coal and gas delay outburst, thus to the mechanism that coal and Gas Outburst occur carry out more comprehensively, more scientific research.
2, this test method can be monitored gas pressure, stress-strain state and the temperature variations of former coal body in outstanding front and back, to reach the target of being familiar with coal and Gas Outburst mechanism under the various factors effect; Because in test, adopt raw coal to 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 the outstanding test of delaying, and prevents from providing basis for this class is special and the extent of injury is large outstanding situation.By the pressure differential of regulating each pressure chamber, bring out in various degree outstanding.Can be familiar with the destruction of outstanding process to coal body, provide support for soft layering in coal seam and outstanding coal study on the genesis; Degree of impairment for coal body under outstanding role and the research of micro-damage state provide basis.So that the mechanism that more scientific Study on Coal and Gas Outburst produce, form science, perfect theory, for being provided fundamental basis in colliery by the control of coal and Gas Outburst.
The accompanying drawing explanation
Fig. 1 is that three axle coals and gas are once given prominence to the left view of test unit;
Fig. 2 is that three axle coals and gas are once given prominence to the front view of 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 pressure chamber for the first time;
Fig. 7 is the vertical view of pressure chamber for the first time.
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-installation pressing plate; 24-confined pressure chamber base; 25-confined pressure penstocks; 26-vacuumize tracheae; 27-gas air intake duct; 28-press water inlet channel; 29-main pressure chamber; 30-for the first time pressure chambers; 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 coals and gas is outstanding test method once, in this test method, has adopted a kind of test unit, and as shown in Figure 1, 2, test unit comprises frame 40, bearing 41, main pressure chamber 29 and pressure chamber 30 for the first time.Bearing 41 is arranged on frame 40, in the both sides of frame 40, column 42 is set vertically respectively, and a moving beam 43 and moving beam drive motor 44 are set between two columns 42, and moving beam 43 is slidably matched with column 42.
The structure of main pressure chamber is as shown in Fig. 3,4 and 5, this main pressure chamber 29 comprises confined pressure chamber 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 the driving mechanism that elevating screw 1 rises or descends, load sensor 2, lower bearing plate 4 and confined pressure piston 5.Confined pressure chamber base 24 is arranged on frame 40 by pressing plate 23 is installed, steel cylinder 20 is placed on confined pressure chamber base 24, between confined pressure chamber upper cover 18 and steel cylinder 20, confined pressure O-ring seal 19 is set, confined pressure chamber upper cover 18 is pressed on steel cylinder 20 by pull bar 22, at the outer one deck protection network 21 that arranges of steel cylinder 20.Lower bearing plate 4 is arranged in steel cylinder 20 and is slidably matched with the inwall of steel cylinder 20, and elevating screw 1 vertically is arranged on the below of lower bearing plate 4 and withstands on lower bearing plate 4 by load sensor 2.The tapered structure in the top of lower bearing plate 4, confined pressure piston 5 are enclosed within the top of lower bearing plate 4 and are sealed and matched by gum cover 11 and lower bearing plate 4, and the outer wall of confined pressure piston 5 coordinates 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 tapered hollow structure suitable for reading, and aspis seal taper sleeve 12 is pressed in the bell of confined pressure chamber upper cover 18 and by gum cover 11 and confined pressure chamber upper cover 18 and is sealed and matched, and is provided with vent valve 17 on confined pressure chamber upper cover 18.At the middle part of confined pressure piston 5 and lower bearing plate 4, be provided with gas air intake duct 27 and vacuum pumping air flue, gas air intake duct 27 is connected with gas inlet pipe 3, the vacuum pumping air flue with vacuumize tracheae 26 and be connected, on confined pressure piston 5 and lower bearing plate 4 and keep to the side and be provided with press water inlet channel 28, press water inlet channel 28 is connected with confined pressure penstocks 25.Elevating screw 1 is ball screw, driving mechanism comprises reducer of turbodrill 45 and the motor that is arranged on elevating screw 1 below, driven by motor reducer of turbodrill 45 parts such as grade drive elevating screw 1 and move up or down, and move up or down thereby promote lower bearing plate 4.Below reducer of turbodrill 45, be provided with tape displacement transducer 46.
As shown in Figure 6,7, for the 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.On the circumference of pressure chamber's sleeve 32, be laid with at least two through holes (in the present embodiment, on the circumference of pressure chamber's sleeve 32, be laid with three through holes), in each through hole, be provided with a spring lock shotpin 33 put 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 is located in pressure chamber's sleeve 32 and is slidably matched with the inwall of pressure chamber's sleeve 32.Top cover 37 is hollow structure the top that is arranged on pressure chamber's sleeve 32 by screw 49, and top cover 37 coordinates with the top seal of pressure chamber's sleeve 32.One side pressure of energy-storaging spring 36 is 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 and be hollow structure, puncture the below, middle part that cutter 34 is arranged on energy-storaging spring seat 35, in the present embodiment, puncture cutter 34 and be hollow tube, one end of hollow tube is connected to the below, 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 screws 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 O-ring seal 48 and the inner hole wall of top cover 37.The 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 is slidably matched with orienting sleeve 52, one end of tooth bar 51 arranges tractive magnet 50, and this tractive magnet 50 slides on orienting sleeve 52 be used to driving tooth bar 51, at the other end of tooth bar 51, tooth bar reset components 53 is set.Wheel and rack 51 tooth engagements 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 to the interior movement of 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 moves.At gear and the outer guard shield 55 that arranges of cam mechanism 54, by guard shield lock-screw 56, connect between guard shield 55.
This three axles coal and gas is outstanding test method once, comprises the steps:
1) extracting diameter is the raw coal test specimen of 50~100mm, the raw coal test specimen is contained in flexible steel bushing 9 and by flexible steel bushing 9 and fixes, flexible steel bushing 9 is arranged between the confined pressure chamber upper cover 18 and lower bearing plate 4 in main pressure chamber 29, then is enclosed within and stretches that steel bushing 9 is outer seals the raw coal test specimen with gum cover 11.Gas air intake duct 27 and vacuum pumping air flue are communicated with the raw coal test specimen, and in the present embodiment, the vacuum pumping air flue is communicated with gas air intake duct 27.Make between gum cover 11 and steel cylinder 20 to form the confined pressure chamber, the confined pressure chamber communicates with press water inlet channel 28, communicates in vent valve 17 and confined pressure chamber.
2) at the interior laying temperature sensor of flexible steel bushing 9, pressure transducer, built-in foil gauge 10(, comprise shaft position sensor and radial extensometer 8), complete the connection of various lead-in wires.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 screws 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.At the endoporus near aspis seal taper sleeve 12, be provided with aspis baroceptor 16.
4) pressure chamber 30 for the first time is installed at the top of main pressure chamber 29, the 30De of pressure chamber pressure chamber sleeve 32 is for the first time coordinated with the top seal of confined pressure chamber upper cover 18, the cutter 34 of puncturing in pressure chamber 30 is aimed at the sealing aluminium flake I 14 in main pressure chamber 29 for the first time.
5) log-on data is controlled and acquisition system, the variation of stress, temperature and the gaseous tension of raw coal test specimen before and after monitoring test, and it is gathered.
6) the raw coal test specimen in main pressure chamber is pressurizeed, to water filling in the confined pressure chamber between flexible steel bushing 9 and steel cylinder 20, flexible steel bushing 9 interior raw coal test specimens are applied to confined pressure by confined pressure penstocks 25 and press water inlet channel 28; By the raw coal test specimen in 1 pair of flexible steel bushing 9 of elevating screw, apply axial compression, axial compression and confined pressure are added to predetermined load.
7) air of main pressure chamber's gum cover 11 inside is carried out emptying, in the situation that keep axial compression and the constant air of main pressure chamber's gum cover 11 inside of taking out by vacuumizing tracheae 26 and vacuum pumping air flue with vacuum pump of confined pressure, until gaseous tension is lower than 10Pa.
8) in the situation that maintenance axial compression and confined pressure are constant, by gas inlet pipe 3 and gas air intake duct 27, be filled with methane gas to the raw coal test specimen, to in pressure chamber 30, being filled with methane gas for the first time, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with more than methane gas must guarantee 48h; And the gaseous tension in pressure chamber 30 will be lower than the gaseous tension of gum cover 11 inside of main pressure chamber 29 for the first time.
9) pressure chamber's 30 interior cutters 34 that puncture puncture the sealing aluminium flake I 14 in main pressure chamber 29 for the first time; Raw coal test specimen in gum cover 11 and methane gas occur once outstanding; Each data in whole experimentation are carried out to Real-Time Monitoring and collection.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (1)

1. three axle coals and gas outstanding test method once, is characterized in that, in this test method, adopted a kind of main pressure chamber (29) and pressure chamber (30) for the first time;
This main pressure chamber (29) comprises confined pressure chamber 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 the driving mechanism that elevating screw (1) rises or descends, load sensor (2), lower bearing plate (4) and confined pressure piston (5); It is upper that described steel cylinder (20) is placed on confined pressure chamber base (24), between described confined pressure chamber upper cover (18) and steel cylinder (20), confined pressure O-ring seal (19) is set, and confined pressure chamber upper cover (18) is pressed on steel cylinder (20) by pull bar (22); Described lower bearing plate (4) is arranged in steel cylinder (20) and is slidably matched with the inwall of steel cylinder (20), described elevating screw (1) vertically is 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 tapered hollow structure suitable for reading, and described aspis seal taper sleeve (12) is pressed in the bell of confined pressure chamber upper cover (18) and is sealed and matched with confined pressure chamber upper cover (18);
Described pressure chamber for the 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); On the circumference of described pressure chamber sleeve (32), be laid with at least two through holes, in each through hole, be provided with a spring lock shotpin (33) put in pressure chamber's sleeve (32), described spring lock shotpin (33) slides and is sealed and matched with through hole; Described energy-storaging spring seat (35) is hollow structure, energy-storaging spring seat (35) is located in pressure chamber's sleeve (32) and is slidably matched with the inwall of pressure chamber's sleeve (32), described top cover (37) is hollow structure the top that is arranged on pressure chamber's sleeve (32), top cover (37) is sealed and matched with pressure chamber's sleeve (32), one side pressure of described energy-storaging spring (36) is on energy-storaging spring seat (35), it is upper that the other end of energy-storaging spring (36) is pressed in top cover (37), and described energy-storaging spring seat (35) is pressed on spring lock shotpin (33); The described cutter (34) that punctures is hollow structure, punctures the below, middle part that cutter (34) is arranged on 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) screws in the hollow hole of top cover (37) and is pressed on sealing aluminium flake II (38);
This test method comprises the steps:
1) extract the raw coal test specimen, the raw coal test specimen is contained in flexible steel bushing (9) and by flexible steel bushing (9) and fixes, flexible steel bushing (9) is arranged between the confined pressure chamber upper cover (18) and lower bearing plate (4) main pressure chamber in, then uses gum cover (11) to be enclosed within flexible steel bushing (9) outward the raw coal test specimen to be sealed;
2) laying temperature sensor, pressure transducer, shaft position sensor and radial extensometer (8) in flexible steel bushing (9);
3) described sealing aluminium flake (14) is arranged on aspis seal taper sleeve (12), described sealing plug I (15) is hollow structure, sealing plug I (15) screws in the upper port of confined pressure chamber upper cover (18) and is pressed in sealing aluminium flake I (14) above, and sealing aluminium flake I (14) is sealed and matched with aspis seal taper sleeve (12);
4) pressure chamber (30) for the first time are installed at the top of main pressure chamber (29), pressure chamber's sleeve (32) of pressure chamber (30) is for the first time coordinated with the top seal of confined pressure chamber upper cover (18), and the cutter (34) that punctures on pressure chamber (30) is aimed at the sealing aluminium flake I (14) in main pressure chamber (29) for the first time;
5) log-on data is controlled and acquisition system, the variation of stress, temperature and the gaseous tension of raw coal test specimen 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), the raw coal test specimen in flexible steel bushing (9) is applied to confined pressure; By elevating screw (1), the raw coal test specimen in flexible steel bushing (9) is applied to axial compression;
7) the inner air of main pressure chamber's gum cover (11) is carried out emptying, in the situation that keep the constant air of taking out main pressure chamber's gum cover (11) inside with vacuum pump of axial compression and confined pressure, until gaseous tension is lower than 10Pa;
8) in the situation that keep axial compression and confined pressure constant, respectively to the raw coal test specimen in main pressure chamber with in pressure chamber (30), be filled with methane gas for the first time, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with more than methane gas must guarantee 48h; And pressure chamber (30) interior gaseous tension will be lower than the inner gaseous tension of the gum cover (11) of main pressure chamber (29) for the first time;
9) pressure chamber (30) interior cutter (34) that punctures punctures the sealing aluminium flake I (14) in main pressure chamber (29) for the first time; Raw coal test specimen in gum cover (11) and methane gas occur once outstanding; Each data in whole experimentation are carried out to Real-Time Monitoring and collection.
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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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN105891440A (en) * 2016-04-11 2016-08-24 辽宁工程技术大学 Coal and gas outburst testing device with supplemental gas source and method
CN106124380A (en) * 2016-06-22 2016-11-16 太原理工大学 A kind of similarity simulation experiment is measured the device and method of coal column breathability
CN107515289A (en) * 2017-10-25 2017-12-26 辽宁工程技术大学 A kind of coal and gas prominent simulation test device

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