CN103454385B - Coal and gas outburst simulation experiment device during roadway exposure - Google Patents
Coal and gas outburst simulation experiment device during roadway exposure Download PDFInfo
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- CN103454385B CN103454385B CN201310425615.4A CN201310425615A CN103454385B CN 103454385 B CN103454385 B CN 103454385B CN 201310425615 A CN201310425615 A CN 201310425615A CN 103454385 B CN103454385 B CN 103454385B
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Abstract
The invention discloses a coal and gas outburst simulation experiment device during roadway exposure. The coal and gas outburst simulation experiment device is characterized by comprising a sealed loading box, a coal sample test piece, a flexible loading system and a gas supply system; the problems of stress, deformation and failure of the surrounding rock of the deeply-mined roadway can be approximately considered as an axisymmetric problem, so that only one part of the surrounding rock needs to be taken to reflect the integral property of the surrounding rock; firstly, the test piece is loaded to be in a high stress state, then a lower baffle plate of the sealed loading box can be rapidly pulled out to simulate the exposure of the roadway; the test piece is destroyed and has certain displacement under the influences of the surrounding rock pressure and the gas pressure during roadway exposure, in the process, a counter-force steel strand supplements load to the test piece rapidly to simulate further extruding and work-doing of the external surrounding rock to the coal rock, a great amount of gas adsorbed in the coal body desorbs and does work to the coal rock; finally, the coal sample test piece suffers from coal and gas outburst under the influences of integrated factors such as gas pressure, surrounding rock stress, vibration effect and the like.
Description
Technical field
The present invention relates to the coal and gas prominent disaster occurred in tunnel in process of coal mining, particularly relate to a kind of experimental provision can simulating the coal and gas prominent occurred when tunnel discloses.
Background technology
Greatly disastrous due to coal and gas prominent, be difficult to carry out real-time follow-up research when there is coal and gas prominent disaster at the scene, therefore the effective ways that simulated experiment is research coal and gas prominent rule are carried out in room by experiment.Although related scientific research mechanism has carried out a large amount of coal and gas prominent similar material simulation work, but still there is many deficiencies, specifically comprise following several aspect both at home and abroad:
One, when tunnel discloses, excavation spatial peripheral produces obvious stress and concentrates, and it is broken to cause coal body to aggravate, and these factors are on the impact having highly significant of coal and gas prominent.But the coal and gas prominent experimental provision of routine can only simulate uniform stress field, can not consider that stress that roadway excavation causes is concentrated and the impact of rock crusher degree.
Two, the coal and gas prominent experimental provision rigidity adopted in experiment is at present too large, well can not consider that energy phenomenon is filled in the further acting of coal and rock destructive process China and foreign countries' side surrouding rock deformation to coal and rock, and desorption of mash gas expansion is not enough to it is fully broken to coal and rock institute work and dishes out, therefore the coal and rock test specimen that experiment adopts at present is not the coal cinder of self-assembling formation, but is formed by coal dust compacting.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, coal and gas prominent analogue experiment installation when providing a kind of tunnel to disclose.
For achieving the above object, the present invention adopts following technical proposals:
Coal and gas prominent analogue experiment installation when a kind of tunnel discloses, is characterized in that comprising sealing loads box, coal sample test specimen, flexible loading system and gas supply system;
Described sealing loads box, comprises trapezoidal plate, side shield, loading cushion block, upper cover plate and lower baffle plate; Above-mentioned each device contact site arranges pad rubber blanket to ensure sealing property; Trapezoidal plate comprises the first trapezoidal plate and the second trapezoidal plate, and inclination angle and the coal sample test specimen inclination angle of inclined plane on its inclined-plane match; Side shield comprises the first side shield and the second side shield, and be separately fixed at the both sides, front and back of trapezoidal plate, its inside surface contacts with the front and rear surfaces of coal sample test specimen respectively, reserved arcuate socket on the downside of the first side shield; Loading cushion block the first half is cylindrical structure, and the latter half is circular arc steel plate, and lower surface of steel plate is provided with the air slot intersected in length and breadth, and lower surface is also provided with layer of steel wire net, and woven wire contacts with coal sample test specimen upper surface; Load between cushion block side and trapezoidal plate inclined-plane and leave space, extrude both preventing in loading procedure; Circular port is left in the middle of upper cover plate, the cylindrical structure loading cushion block is passed through by circular port, circular port surface is provided with rubber gasket, with cylindrical structure close contact, both cylindrical structure and upper cover plate had been allowed relative motion can to occur, prevent again gas from overflowing thus, the side also reserved gas filling orifice of upper cover plate; Lower baffle plate is arranged on the downside of coal sample test specimen, and its left and right sides contact with trapezoidal plate, and trailing flank contacts with the second side shield, the arcuate socket that front side is reserved through the first side shield; Load box inwall in sealing and scribble lubricant to reduce the friction force between itself and coal sample test specimen;
Described coal sample test specimen, upper and lower surface is coaxial circles cambered surface, and the extension line of left and right side passes through the axis of above-mentioned arc surface, and front and back sides is perpendicular to surface level, and four sides all scribble 704 silicon rubber and load box close contact to ensure its impermeability with sealing;
Described flexible loading system, comprises base, load cylinder, oil sources, reaction plate, counter-force steel strand wires and supporting guide; Load cylinder has two, for applying static load; The reaction plate left and right sides is respectively equipped with multiple through hole for connecting counter-force steel strand wires; Counter-force steel strand wires have many, and wherein one end of any one is fixed on base, and the other end is fixed on reaction plate, are adjusted the rigidity of flexible loading system by the number and/or diameter adjusting steel strand wires; Supporting guide is fixed on base, and its effect holds sealing on pretreatment to load box, prevents it from deflection occurring in experimentation;
Described gas supply system, comprises gas supply tank, the first high-voltage tube, the first valve, gas pressure pump, the second high-voltage tube, the second valve, tensimeter, flowmeter; Gas supply tank is connected by the first high-voltage tube with gas pressure pump, and is provided with the first valve on the first high-voltage tube; Gas pressure pump is connected by the second high-voltage tube with the gas filling orifice on the upside of sealing loading box, and is provided with the second valve, tensimeter and flowmeter on the second high-voltage tube; Vacuum pump is used for vacuumizing test specimen in experimentation;
Described Measurement and Control System, mainly comprises computing machine, Main Control Tank, data collecting instrument, CCD camera; Computing machine is connected with Main Control Tank by USB interface, and Main Control Tank is connected with data collecting instrument, vertical loading device, gas pressure pump by wire, and data collecting instrument is connected by wire tensimeter, flowmeter; CCD camera is for recording the process of coal and gas prominent.
Test method of the present invention is:
1) make coal sample test specimen, loaded sealing and load in box, sealing is loaded box installation in position; By flexible loading system, test specimen is loaded, unload after keeping certain hour, and then load, after multiple circulation, load and make coal and rock meet the requirements of stress state; In this process, there is fragmentation to a certain degree in coal and rock, and object is that simulation mining work activities is on the impact of coal and rock;
2) by gas supply system, be connected to the gas filling orifice on the upside of sealing loading box, start gas pressure pump, gas pressure in adjustment gas pressure chamber to a certain steady state value, and keeps certain hour, makes the abundant adsorption gas of coal and rock, period should strengthen room ventilation, prevents methane accumulation;
3) extracted out rapidly from the arcuate socket that the first side shield is reserved by the lower baffle plate of mechanical hook-up by sealing loading box, under the combined action of pressure from surrounding rock and gas pressure, coal sample test specimen is broken and give prominence to from the downside that sealing loads box, gives prominence to process by CCD camera record coal and rock;
4) stop gas supply, shed the load of flexible loading system, open sealing and load box, take out test specimen, the destruction situation of record analysis test specimen.
Principle of the present invention is:
Stressed, the deformation and failure problem of Deep Roadway country rock can be similar to thinks axisymmetric problem, therefore, get its part (i.e. coal sample test specimen of the present invention) to carry out testing the character that can reflect country rock entirety, relative to tunneling boring experimental provision, large-scale experimental study can be carried out;
The present invention applies pressure by load cylinder and counter-force steel strand wires to test specimen, and under making it be in high-stress state, counter-force steel strand wires have certain elastic elongation in this process; The lower baffle plate loading box by extracting sealing fast out simulates the exposure in tunnel; When tunnel discloses, test specimen produces certain destruction under pressure from surrounding rock and gas pressure impact, and produces certain displacement, counter-force steel strand wires shrink instantaneously in this process, carry out rapidly supplementing to test specimen and load, be i.e. makeup energy, simulate the further extruding acting of outside country rock to coal and rock; In this process, the gas adsorbed in coal body is a large amount of desorb also, also can do work to coal and rock; Finally, coal sample test specimen issues raw coal and gas prominent in composite factor impacts such as gas pressure, surrouding rock stress, vibration effects.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Fig. 1 is mechanics principle figure of the present invention;
Fig. 2 is agent structure schematic diagram of the present invention.
Embodiment
By reference to the accompanying drawings 1, the present invention adopts the principle of local coal sample test specimen to be: stressed, the deformation and failure problem of Deep Roadway country rock can be similar to thinks axisymmetric problem, get its part (i.e. infiltration test specimen 5 of the present invention) to carry out testing the character that can reflect country rock entirety, relative to tunneling boring experimental provision, large-scale experimental study can be carried out.
By reference to the accompanying drawings 2, coal and gas prominent analogue experiment installation when a kind of tunnel discloses, comprises sealing and loads box, coal sample test specimen, flexible loading system and gas supply system.
Described sealing loads box, comprises trapezoidal plate 1, side shield, loading cushion block 2, upper cover plate 3 and lower baffle plate 4; Above-mentioned each device contact site arranges pad rubber blanket to ensure sealing property; Trapezoidal plate comprises the first trapezoidal plate and the second trapezoidal plate, and inclination angle and the coal sample test specimen inclination angle of inclined plane on its inclined-plane match; Side shield comprises the first side shield and the second side shield, and be separately fixed at the both sides, front and back of trapezoidal plate, its inside surface contacts with the front and rear surfaces of coal sample test specimen respectively, reserved arcuate socket on the downside of the first side shield; Loading cushion block the first half is cylindrical structure, and the latter half is circular arc steel plate, and lower surface of steel plate is provided with the air slot intersected in length and breadth, and lower surface is also provided with layer of steel wire net, and woven wire contacts with coal sample test specimen upper surface; Load between cushion block side and trapezoidal plate inclined-plane and leave space, extrude both preventing in loading procedure; Circular port is left in the middle of upper cover plate, the cylindrical structure loading cushion block is passed through by circular port, circular port surface is provided with rubber gasket, with cylindrical structure close contact, both cylindrical structure and upper cover plate had been allowed relative motion can to occur, prevent again gas from overflowing thus, the side also reserved gas filling orifice of upper cover plate; Lower baffle plate is arranged on the downside of coal sample test specimen, and its left and right sides contact with trapezoidal plate, and trailing flank contacts with the second side shield, the arcuate socket that front side is reserved through the first side shield; Load box inwall in sealing and scribble lubricant to reduce the friction force between itself and coal sample test specimen.
Described coal sample test specimen 5, upper and lower surface is coaxial circles cambered surface, and the extension line of left and right side passes through the axis of above-mentioned arc surface, and front and back sides is perpendicular to surface level, and four sides all scribble 704 silicon rubber and load box close contact to ensure its impermeability with sealing.
Described flexible loading system, comprises base 6, load cylinder 7, oil sources, reaction plate 8, counter-force steel strand wires 9 and supporting guide 10; Load cylinder has two, for applying static load; The reaction plate left and right sides is respectively equipped with multiple through hole for connecting counter-force steel strand wires; Counter-force steel strand wires have many, and wherein one end of any one is fixed on base, and the other end is fixed on reaction plate, are adjusted the rigidity of flexible loading system by the number and/or diameter adjusting steel strand wires; Supporting guide is fixed on base, and its effect holds sealing on pretreatment to load box, prevents it from deflection occurring in experimentation.
Described gas supply system, comprises gas supply tank, the first high-voltage tube, the first valve, gas pressure pump, the second high-voltage tube, the second valve, tensimeter, flowmeter; Gas supply tank is connected by the first high-voltage tube with gas pressure pump, and is provided with the first valve on the first high-voltage tube; Gas pressure pump is connected by the second high-voltage tube with the gas filling orifice on the upside of sealing loading box, and is provided with the second valve, tensimeter and flowmeter on the second high-voltage tube; Vacuum pump is used for vacuumizing test specimen in experimentation.
Described Measurement and Control System, mainly comprises computing machine, Main Control Tank, data collecting instrument, CCD camera; Computing machine is connected with Main Control Tank by USB interface, and Main Control Tank is connected with data collecting instrument, vertical loading device, gas pressure pump by wire, and data collecting instrument is connected by wire tensimeter, flowmeter; CCD camera is for recording the process of coal and gas prominent.
Test method of the present invention is:
1) make coal sample test specimen, loaded sealing and load in box, sealing is loaded box installation in position; By flexible loading system, test specimen is loaded, unload after keeping certain hour, and then load, after multiple circulation, load and make coal and rock meet the requirements of stress state; In this process, there is fragmentation to a certain degree in coal and rock, and object is that simulation mining work activities is on the impact of coal and rock;
2) by gas supply system, be connected to the gas filling orifice on the upside of sealing loading box, start gas pressure pump, gas pressure in adjustment gas pressure chamber to a certain steady state value, and keeps certain hour, makes the abundant adsorption gas of coal and rock, period should strengthen room ventilation, prevents methane accumulation;
3) extracted out rapidly from the arcuate socket that the first side shield is reserved by the lower baffle plate of mechanical hook-up by sealing loading box, under the combined action of pressure from surrounding rock and gas pressure, coal sample test specimen is broken and give prominence to from the downside that sealing loads box, gives prominence to process by CCD camera record coal and rock;
4) stop gas supply, shed the load of flexible loading system, open sealing and load box, take out test specimen, the destruction situation of record analysis test specimen.
The above embodiment, the just one of the embodiment that the present invention is more preferably concrete, the usual change that those skilled in the art carries out within the scope of technical solution of the present invention and replacement all should be included in protection scope of the present invention.
Claims (3)
1. coal and gas prominent analogue experiment installation when tunnel discloses, is characterized in that: comprise sealing and load box, coal sample test specimen, flexible loading system and gas supply system;
Described sealing loads box, comprises trapezoidal plate, side shield, loading cushion block, upper cover plate and lower baffle plate; Above-mentioned each device contact site arranges pad rubber blanket to ensure sealing property; Trapezoidal plate comprises the first trapezoidal plate and the second trapezoidal plate, and inclination angle and the coal sample test specimen inclination angle of inclined plane on its inclined-plane match; Side shield comprises the first side shield and the second side shield, and be separately fixed at the both sides, front and back of trapezoidal plate, its inside surface contacts with the front and rear surfaces of coal sample test specimen respectively, reserved arcuate socket on the downside of the first side shield; Loading cushion block the first half is cylindrical structure, and the latter half is circular arc steel plate, and lower surface of steel plate is provided with the air slot intersected in length and breadth, and lower surface is also provided with layer of steel wire net, and woven wire contacts with coal sample test specimen upper surface; Load between cushion block side and trapezoidal plate inclined-plane and leave space, extrude both preventing in loading procedure; Circular port is left in the middle of upper cover plate, the cylindrical structure loading cushion block is passed through by circular port, circular port surface is provided with rubber gasket, with cylindrical structure close contact, both cylindrical structure and upper cover plate had been allowed relative motion can to occur, prevent again gas from overflowing thus, the side also reserved gas filling orifice of upper cover plate; Lower baffle plate is arranged on the downside of coal sample test specimen, and its left and right sides contact with trapezoidal plate, and trailing flank contacts with the second side shield, the arcuate socket that front side is reserved through the first side shield; Load box inwall in sealing and scribble lubricant to reduce the friction force between itself and coal sample test specimen;
Described coal sample test specimen, upper and lower surface is coaxial circles cambered surface, and the extension line of left and right side passes through the axis of above-mentioned arc surface, and front and back sides is perpendicular to surface level, and four sides all scribble 704 silicon rubber and load box close contact to ensure its impermeability with sealing;
Described flexible loading system, for loading test specimen, makes coal and rock meet the requirements of stress state, and fragmentation to a certain degree occurs, and comprises base, load cylinder, oil sources, reaction plate, counter-force steel strand wires and supporting guide; Load cylinder has two, for applying static load; The reaction plate left and right sides is respectively equipped with multiple through hole for connecting counter-force steel strand wires; Counter-force steel strand wires have many, wherein one end of any one is fixed on base, the other end is fixed on reaction plate, the rigidity of flexible loading system is adjusted by the number and/or diameter adjusting steel strand wires, in test specimen destructive process, counter-force steel strand wires shrink instantaneously, carry out rapidly supplementing to test specimen and load, be i.e. makeup energy, simulate the further extruding acting of outside country rock to coal and rock; Supporting guide is fixed on base, and its effect holds sealing on pretreatment to load box, prevents it from deflection occurring in experimentation;
Described gas supply system, comprises gas supply tank, the first high-voltage tube, the first valve, gas pressure pump, the second high-voltage tube, the second valve, tensimeter, flowmeter; Gas supply tank is connected by the first high-voltage tube with gas pressure pump, and is provided with the first valve on the first high-voltage tube; Gas pressure pump is connected by the second high-voltage tube with the gas filling orifice on the upside of sealing loading box, and is provided with the second valve, tensimeter and flowmeter on the second high-voltage tube; Vacuum pump is used for vacuumizing test specimen in experimentation;
2. when a kind of tunnel according to claim 1 discloses, coal and gas prominent analogue experiment installation, is characterized in that comprising Measurement and Control System, mainly comprises computing machine, Main Control Tank, data collecting instrument, CCD camera; Computing machine is connected with Main Control Tank by USB interface, and Main Control Tank is connected with data collecting instrument, vertical loading device, gas pressure pump by wire, and data collecting instrument is connected by wire tensimeter, flowmeter; CCD camera is for recording the process of coal and gas prominent.
3. the experimental technique of coal and gas prominent analogue experiment installation when the tunnel as described in as arbitrary in claim 1-2 discloses, is characterized in that:
The first step: make coal sample test specimen, is loaded sealing and is loaded in box, sealing is loaded box installation in position; By flexible loading system, test specimen is loaded, unload after keeping certain hour, and then load, after multiple circulation, load and make coal and rock meet the requirements of stress state; In this process, there is fragmentation to a certain degree in coal and rock, and object is that simulation mining work activities is on the impact of coal and rock;
Second step: by gas supply system, is connected to the gas filling orifice on the upside of sealing loading box, starts gas pressure pump, gas pressure in adjustment gas pressure chamber to a certain steady state value, and keeps certain hour, makes the abundant adsorption gas of coal and rock, period should strengthen room ventilation, prevents methane accumulation;
3rd step: extracted out rapidly from the arcuate socket that the first side shield is reserved by the lower baffle plate of mechanical hook-up by sealing loading box, under the combined action of pressure from surrounding rock and gas pressure, coal sample test specimen is broken and give prominence to from the downside that sealing loads box, gives prominence to process by CCD camera record coal and rock;
4th step: stop gas supply, shed the load of flexible loading system, opens sealing and loads box, take out test specimen, the destruction situation of record analysis test specimen.
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| CN201310425615.4A CN103454385B (en) | 2013-09-18 | 2013-09-18 | Coal and gas outburst simulation experiment device during roadway exposure |
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| CN201310425615.4A CN103454385B (en) | 2013-09-18 | 2013-09-18 | Coal and gas outburst simulation experiment device during roadway exposure |
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| CN104391102B (en) * | 2014-11-12 | 2016-03-23 | 重庆大学 | Symmetrical instantaneous the unloading of gases at high pressure hoop crushes coal experimental provision |
| CN105242016A (en) * | 2015-11-04 | 2016-01-13 | 太原理工大学 | Method for predicting coal and gas outburst danger |
| CN108871905B (en) * | 2018-08-20 | 2020-08-04 | 山东科技大学 | Test method for influence of bedding surface roughness on deformation and permeability of mining coal seam |
| CN110411722B (en) * | 2019-07-26 | 2021-07-09 | 中国航发沈阳发动机研究所 | Structural static force and fatigue test device |
| CN112326831B (en) * | 2020-11-03 | 2022-08-16 | 安徽理工大学 | Coal rock torsional friction comprehensive experiment system |
| CN114544370B (en) * | 2022-02-24 | 2024-05-07 | 重庆交通大学 | Experimental device and experimental method for simulating tunnel coal and gas outburst axial pressure loading |
| CN117074168A (en) * | 2023-07-05 | 2023-11-17 | 中国矿业大学(北京) | Surrounding rock deformation experimental device and method for horizontal and vertical linkage mechanics simulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU796459A1 (en) * | 1978-12-11 | 1981-01-15 | Восточный Научно-Исследовательскийинститут По Безопасности Работ Вгорной Промышленности | Device for simulating instant coal and gas outburst |
| CN101226183B (en) * | 2008-01-22 | 2011-09-07 | 重庆大学 | Projecting simulator stand for coal and firedamp |
| CN101377480B (en) * | 2008-09-25 | 2012-01-04 | 山东科技大学 | Flexible loading system for stope mine pressing three-dimensional physical simulation test stand |
| CN201285392Y (en) * | 2008-11-14 | 2009-08-05 | 重庆大学 | Mold for coal and firedamp projecting simulator experiment |
| CN201435175Y (en) * | 2009-07-03 | 2010-03-31 | 中国矿业大学 | Rock burst simulator |
| CN101598030B (en) * | 2009-07-14 | 2012-02-01 | 中国矿业大学 | Method for realizing fast coal exposing of coal seam rock cross with outburst danger |
| CN102645518B (en) * | 2012-04-12 | 2014-08-20 | 辽宁工程技术大学 | Coal and gas outburst jet characteristic simulation experiment device |
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