CN103412096A - Multi-parameter method for monitoring coal and gas outburst under condition of multi-field coupling - Google Patents
Multi-parameter method for monitoring coal and gas outburst under condition of multi-field coupling Download PDFInfo
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- CN103412096A CN103412096A CN2013103757038A CN201310375703A CN103412096A CN 103412096 A CN103412096 A CN 103412096A CN 2013103757038 A CN2013103757038 A CN 2013103757038A CN 201310375703 A CN201310375703 A CN 201310375703A CN 103412096 A CN103412096 A CN 103412096A
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Abstract
The invention discloses a multi-parameter method for monitoring coal and gas outburst under the condition of multi-field coupling. 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 on an outburst opening sealing taper sleeve, and screwing a sealing screw plug in the upper end of the confining pressure cavity upper cover; 4) monitoring variations of stresses, temperatures and gas pressures of the raw coal test specimen before and after tests; 5) pressurizing the test specimen in a main pressure chamber, and increasing the axial pressure and confining pressure to the predetermined loads; 6) evacuating air inside a rubber sleeve of the main pressure chamber; 7) filling gases into the raw coal test specimen; and 8) piercing the sealing aluminium sheet to generate outburst, and carrying out real-time monitoring and gathering on various data. By adopting the method, raw coal in different sizes can be adopted to carry out coal and gas outburst tests in the triaxial stress state to study the coal and gas outburst occurrence principles more comprehensively and scientifically.
Description
Technical field
The present invention relates to a kind of coal and Gas Outburst multi-parameter monitoring method, particularly relate to coal and Gas Outburst multi-parameter monitoring method under a kind of many coupling conditions.
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 coal and Gas Outburst multi-parameter monitoring method under a kind of many coupling conditions.The method can adopt the raw coal of different size under triaxial stress state, to carry out coal and gas burst experiment, to the mechanism that coal and Gas Outburst occur 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:
Coal and Gas Outburst multi-parameter monitoring method under many coupling conditions, in this monitoring method, adopted a kind of main pressure chamber, this main pressure chamber comprises confined pressure chamber base, steel cylinder, confined pressure chamber upper cover, aspis seal taper sleeve, sealing aluminium flake, sealing plug, elevating screw, 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;
This monitoring method 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 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 screws in the upper port of confined pressure chamber upper cover and is pressed on the sealing aluminium flake, and sealing aluminium flake and aspis seal taper sleeve are sealed and matched;
4) 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;
5) 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;
6) 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;
7) in the situation that keep axial compression and confined pressure constant, to the raw coal test specimen, be filled with methane gas, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with more than methane gas must guarantee 48h;
8) after everything in readiness, puncture the sealing aluminium flake, the raw coal test specimen in gum cover and methane gas produce outstanding; Each data in whole experimentation are carried out to Real-Time Monitoring and collection.
Compared with prior art, under many coupling conditions of the present invention, coal and Gas Outburst multi-parameter monitoring method have following advantage:
1, the method can adopt the raw coal of different size under triaxial stress state, to carry out coal and gas burst experiment, to the mechanism that coal and Gas Outburst occur carry out more comprehensively, more scientific research.
2, the 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, the method can be familiar with the destruction of outstanding process to coal body, provides 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 the structural representation of main pressure chamber;
Fig. 2 is the structural representation of main pressure chamber's top seal;
Fig. 3 is the structural representation of main pressure chamber's lower seal.
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.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Under many coupling conditions, coal and Gas Outburst multi-parameter monitoring method, adopted a kind of main pressure chamber in this monitoring method.
As shown in Figure 1,2 and 3, this main pressure chamber comprises confined pressure chamber base 24, steel cylinder 20, confined pressure chamber upper cover 18, aspis seal taper sleeve 12, sealing aluminium flake 14, sealing plug 15, elevating screw 1, load sensor 2, lower bearing plate 4 and confined pressure piston 5 to the structure of main pressure chamber.Confined pressure chamber base 24 is arranged on frame 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, 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 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 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.
Under these many coupling conditions, coal and Gas Outburst multi-parameter monitoring method, comprise 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 main pressure chamber in, 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) 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.
5) 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.
6) 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.
7) in the situation that keep axial compression and confined pressure constant, by gas inlet pipe 3 and gas air intake duct 27, be filled with methane gas to the raw coal test specimen, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with more than methane gas must guarantee 48h.
8) after everything in readiness, puncture sealing aluminium flake 14, the raw coal test specimen in gum cover 11 and methane gas produce 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. coal and Gas Outburst multi-parameter monitoring method under many coupling conditions, it is characterized in that, in this monitoring method, adopted a kind of main pressure chamber, this main pressure chamber comprises confined pressure chamber base (24), steel cylinder (20), confined pressure chamber upper cover (18), aspis seal taper sleeve (12), sealing aluminium flake (14), sealing plug (15), elevating screw (1), 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);
This monitoring method 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) 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 (15) screws in the upper port of confined pressure chamber upper cover (18) and is pressed in sealing aluminium flake (14) above, and sealing aluminium flake (14) is sealed and matched with aspis seal taper sleeve (12);
4) 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;
5) 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;
6) 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;
7) in the situation that keep axial compression and confined pressure constant, to the raw coal test specimen, be filled with methane gas, make the adsorbed gas of raw coal test specimen reach equilibrium state, be filled with more than methane gas must guarantee 48h;
8) after everything in readiness, puncture sealing aluminium flake (14), the raw coal test specimen in gum cover (11) and methane gas produce outstanding; Each data in whole experimentation are carried out to Real-Time Monitoring and collection.
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Cited By (4)
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| CN104007250A (en) * | 2014-06-17 | 2014-08-27 | 重庆大学 | Visual tri-axial seepage device |
| CN108205054A (en) * | 2018-01-29 | 2018-06-26 | 西安科技大学 | Destructive characteristics experimental provision of the coal cinder containing high pressure gas in the unexpected release of ambient atmos |
| CN110618072A (en) * | 2019-09-06 | 2019-12-27 | 河南工程学院 | Coal body crack monitoring-gas permeation experimental device |
| CN114352268A (en) * | 2022-01-14 | 2022-04-15 | 河南理工大学 | Device and method for testing gas pressure of water-containing surrounding rock coal seam |
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| CN108205054A (en) * | 2018-01-29 | 2018-06-26 | 西安科技大学 | Destructive characteristics experimental provision of the coal cinder containing high pressure gas in the unexpected release of ambient atmos |
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| CN114352268A (en) * | 2022-01-14 | 2022-04-15 | 河南理工大学 | Device and method for testing gas pressure of water-containing surrounding rock coal seam |
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