CN102353608A - Device and method for measuring prediction index critical value of coal and gas outburst - Google Patents
Device and method for measuring prediction index critical value of coal and gas outburst Download PDFInfo
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Abstract
The invention discloses a device and a method for measuring a prediction index critical value of coal and gas outburst. The device mainly comprises a pressure loading device, a gas loading device, an outburst starting device, an observation device and a data acquisition and analysis device. Deformation and damage conditions of a coal body and a coal sample in the outburst experiment process is observed and recorded by simulating ground stress of an experiment mine; and pressure, temperatures, acoustic emission, electric potentials, electromagnetic radiation signals and variation conditions in the experiment process are acquired through data acquisition and analysis. Differences of gas bearing conditions, the ground stress and the mechanical property of the coal body in the mine are comprehensively taken into consideration, and experiments are performed according to actual conditions of all mines to determine the prediction index critical value of the coal and gas outburst; specific conditions of the experiment mine can be actually reflected by the acquired experiment parameters and results; compared with a unified index critical value, the determined prediction critical value of the coal and gas outburst is more scientific; and the device has a compact structure and low manufacturing cost, the method is simple, and the device and the method are easy to operate and high in reliability.
Description
Technical field
The present invention relates to outstanding determinator of coal and gas and method, especially a kind of outstanding parameter and the coal of critical value and the determinator and method of gas outbursts Prediction index critical value confirmed that be applicable to.
Background technology
Coal and gas are outstanding to be the dynamic phenomenon in the mine, and the mechanism of its generation is comparatively complicated, and mutual restriction between the outstanding key element.People have carried out big quantity research to the outburst prediction of coal and gas, but under present circumstances, and that identifies that the coal seam has or not the used gas pressure index of outburst hazard critical value confirms to mainly contain following several method:
The gas pressure critical value that in " control coal and gas are outstanding to be stipulated " gas pressure 0.74MPa is had or not outburst danger as differentiation.Owing to influence the outstanding gas of coal and gas, terrestrial stress, coal body mechanical property three big key elements in the very big difference of each mining area existence; Obviously unified critical value can't adapt to the actual conditions in each ore deposit; Can not instruct the production work in each ore deposit effectively, can not be responsive identify danger.Mention relation in " drilling cuttings desorption of mash gas determination of index and application " that 1991 the 3rd phases of Central Region coal deliver, calculate minimum gas pressure and be the gas pressure critical value according to the solid coefficient that minimum gas pressure and projecting coal bed the softest layering when outstanding take place.This method is the experimental formula of utilizing between gas pressure and the solid coefficient, and only considers the physico-mechanical properties of coal body, does not consider the effect of terrestrial stress and gas.2005 the 5th volumes of the paper " relation of expansion energy in initial released gas and coal-bed gas pressure " that China Mining University's journal is delivered in September, 2005 and Hebei College of Science and Engineering's journal, 2 phase papers " utilize spherical shell unstability theoretical confirm the outstanding gas pressure critical value of coal and gas " have all been mentioned through setting up the relation of initial gas expansion energy and coal-bed gas pressure, thereby utilize the definite gas pressure critical value of critical value of expansion energy in initial released gas again.Through utilizing the relation between gas expansion energy and the gas pressure; Confirm the gas pressure critical value through gas expansion energy critical value; Whether gas expansion energy critical value rationally will directly affect the correctness of gas pressure critical value; Relation between gas expansion energy and the gas pressure is to come out through experimental fit simultaneously; Do not get rid of the possibility that has certain error, might cause the accumulation of error; Institutes Of Technology Of He'nan's year in July, 2009 Master's thesis " Huainan Mining Area 8 coal seam Xie Qiaokuang, prominent gas parameter determination method of new Zhuan Zi ore deposit beginning and applied research " is mentioned and is utilized desorption of mash gas index experimental system; Through setting up the relational expression between desorption of mash gas index and the gas pressure, utilize the desorption of mash gas index critical value of confirming to confirm pressure threshold again.Through utilizing the relation between desorption of mash gas index and the gas pressure; Confirm the gas pressure critical value through desorption of mash gas index critical value; Whether desorption of mash gas index critical value rationally will directly affect the correctness of gas pressure critical value; Relation between desorption of mash gas index and the gas pressure is to come out through experimental fit simultaneously; Do not get rid of the possibility that has certain error, might cause the accumulation of error; University Of Chongqing's journal 2010 the 33rd volumes the 3rd phase paper " coal under the different gas pressure conditions and gas are given prominence to simulated experiment " is mentioned coal and the gas outburst simulation test platform that utilizes development; Carry out coal and the outstanding simulated experiment of gas under 5 kinds of different gas pressure levels, obtained the scope of the gas pressure threshold values whether coal and gas protrusion phenomenon take place.Be subjected to the restriction of experimental provision, the ability that the terrestrial stress of this experimental provision loads is less, can not simulate the terrestrial stress condition of mine in various degree, and experiment number is limited, has just obtained the scope of gas pressure critical value, does not draw value more accurately.
Summary of the invention
Technical matters: the objective of the invention is to overcome the weak point in the prior art, provide a kind of compact conformation, simple to operate, accuracy is high, can confirm the mensuration coal of outstanding index and the device and method of gas outbursts Prediction index critical value to different mine concrete conditions.
Technical scheme: the determinator of coal of the present invention and gas outbursts Prediction index critical value; Comprise that antetheca has the container of aspis, is located at pressure-loaded device on the container, gas-loaded device, outstanding starter gear and equipment data acquisition analyzing respectively; Described pressure-loaded device is made up of compression leg, the pressing plate that is threaded with compression leg, is set with cover plate on the compression leg; Described gas-loaded device is made up of gas jar, reduction valve, porous sintered plate and admission piece, and admission piece is positioned on the rear wall of container, and porous sintered plate is positioned on the inwall of container rear; Described outstanding starter gear comprises and is located at the outer aspis baffle plate of container front side wall aspis, is located at the plug in the aspis; The outside of aspis baffle plate is provided with the Y shape depression bar that is pressed in its outside; Container front side wall both sides are respectively equipped with the bearing that plugs together mutually with Y shape depression bar; One side of bearing is provided with the fixedly rotating shaft of Y shape depression bar one end; Opposite side is provided with the fixedly taper bolt of Y shape depression bar, and the taper bolt end is provided with unloader lever; Described data acquisition and analytical equipment comprise pressure transducer, temperature sensor, calibrate AE sensor, electromagnetic radiation sensor, the potentiometric sensor composition on the left side wall that is located at container successively, and pressure transducer, temperature sensor, calibrate AE sensor, electromagnetic radiation sensor, potentiometric sensor link to each other with data collecting instrument through data line respectively; The right side of said container is provided with the observation device of being made up of high-speed camera and glass window, and glass window is positioned on the Right Inboard wall of container, and high-speed camera is positioned at the place ahead over against glass window; The mating surface of described cover plate and container and be provided with O-ring seal with the mating surface of compression leg.
The assay method of coal of the present invention and gas outbursts Prediction index critical value comprises the steps:
(1) chooses the coal sample to be measured of moulded coal or diffusing shape;
(2) coal sample of moulded coal or diffusing shape is packed into from the top of container after, the setting pressure charger;
(3) will open with gas admittance valve and air outlet valve on the reduction valve that the gas jar links to each other, and allow methane gas pass through admission piece and get in container, the impermeability of inspection container sees if there is gas leakage, closes source of the gas afterwards, promptly closes the air outlet valve on the reduction valve;
(4) if there is not gas leakage, then to the pressure-loaded device power is provided through pressure testing machine, exerts pressure to coal sample, the size of its pressure is consistent with the mine terrestrial stress size of getting coal sample;
(5) when the mine of applied pressure and getting coal sample terrestrial stress size is consistent; Opening air outlet valve on the reduction valve adjusts air valve and sets and in container, charge into methane gas 0.6～0.8MPa; And adsorb more than 48 hours, allow the abundant adsorption gas of coal sample, close air outlet valve after absorption is stable;
(6) after the absorption of the coal sample of container is stablized, open the high-speed camera that is located at glass window the place ahead, and the turn-on data Acquisition Instrument, carry out outstanding preceding preparation;
(7) give one of the terminal unloader lever of taper bolt downward impulse force of moment; Taper bolt is come off fast; At this moment; Depression bar one end and bearing are fixed an end and are broken away from; The depression bar other end rotates around rotating shaft; The aspis baffle plate comes off after losing the pressure of depression bar automatically, and the coal sample in the container is poured into aspis under the effect of stress and gas;
If gas and coal sample are given prominence to from aspis, then progressively reduce the amount of charging into of methane gas, repeating step (1)～(7), outstanding to straight gas and coal sample, the force value of record gas at this moment;
If gas and coal sample are not given prominence to, then progressively increase the amount of charging into of methane gas, repeating step (3)～(7), outstanding to straight gas and coal sample from aspis, the force value of record gas at this moment.
Beneficial effect: owing to adopted technique scheme; Taken all factors into consideration the gas bearing condition of mine; The difference of terrestrial stress and coal body mechanical property thereof; And experimentize to each ore deposit actual conditions and to confirm coal and gas outbursts Prediction index critical value; The test parameters that is drawn and result's ability real reaction go out the concrete condition of test mine; With compare with unified index critical value; Determined coal and gas outbursts Prediction index critical value have more science; Owing to confirm coal and gas outbursts Prediction index critical value to the actual property in each ore deposit; Accuracy is high, and its major advantage has:
1. the terrestrial stress through abundant simulated experiment mine, gas, the coal body condition makes the coal that draws and gas outbursts Prediction index critical value more accurately and reliably;
2. have good air-tightness, can carry out coal and the outstanding simulated experiment of gas under the different gas pressure conditions.
3. can observe in the outstanding process of coal and gas the coal body evolutionary process of breaking intuitively;
4. simple in structure, cost of manufacture is low, and is simple to operate, good reliability.
Description of drawings
Fig. 1 is a main TV structure synoptic diagram of the present invention.
Fig. 2 is the A-A sectional structure synoptic diagram of Fig. 1.
Fig. 3 is a plan structure synoptic diagram of the present invention.
Fig. 4 is a test method schematic flow sheet of the present invention.
Among the figure: 1-compression leg, 2-pressing plate, 3-container; The 4-admission piece, 5-pressure transducer, 6-aspis; The 7-plug, 9-aspis baffle plate, 10-bolt; 12-taper bolt, 13-Y shape depression bar are taken out in the 11-commentaries on classics; The 14-bearing, 15-reduction valve, 16-gas jar; The 17-gas admittance valve, 18-air outlet valve, the porous sintered plate of 19-; The 20-glass window, 21-cover plate, 22-screw; The 23-high-speed camera, 24-guardrail, 25-temperature sensor; The 26-calibrate AE sensor, 27-electromagnetic radiation sensor, 28-potentiometric sensor; The 29-data collecting instrument, the 30-unloader lever.
Embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
The determinator of coal of the present invention and gas outbursts Prediction index critical value; Mainly constitute by container 3, pressure-loaded device, gas-loaded device, outstanding starter gear and equipment data acquisition analyzing; The pressure-loaded device is located at the top of container 3; The gas-loaded device is located at the left side of container 3; Outstanding starter gear is located at container 3 right sides; Equipment data acquisition analyzing is located at the front portion of container 3, and the antetheca of container 3 has aspis 6.Described pressure-loaded device is made up of compression leg 1, the pressing plate 2 that is threaded with compression leg 1; Be set with cover plate 21 on the compression leg 1; Compression leg 1 links to each other through being threaded with pressing plate 2; Pressure testing machine institute applied pressure passes to the coal sample of 3 li in container through compression leg 1 and pressing plate 2; Pressure testing machine is realized controlled loading through computer control.Have the circular hole that a voltage supply post 1 passes in the cover plate 21, in order to guarantee sealing effectiveness, cover plate 21 links to each other with container 3 through screw 22, the mating surface of cover plate 21 and container 3 and with the mating surface of compression leg 1 on be equipped with O-ring seal 8.Described gas-loaded device is made up of gas jar 16, reduction valve 15, porous sintered plate 19 and admission piece 4; 15 1 termination gas jars 16 of reduction valve; The other end links to each other with admission piece 4 through wireway; Reduction valve 15 on gas admittance valve 17 and air outlet valve 18 are arranged; Admission piece 4 is positioned on the rear wall of container 3, and porous sintered plate 19 is positioned on the inwall of container 3 rear sides; Porous sintered plate 19 is a porous structure, and gas molecule can pass through, and coal particle can not pass through, and can realize the experiment coal sample is carried out the face inflation, shortens the time that coal sample reaches the adsorption equilibrium state; The methane gas of gas jar 16 gets into containers 3 through reduction valve 15 and, admission piece 4 and porous sintered plate 19.Described outstanding starter gear comprises and is located at the outer aspis baffle plate 9 of container 3 front side wall aspises 6, is located at the plug 7 in the aspis 6; The outside of aspis baffle plate 9 is provided with the Y shape depression bar 13 that is pressed in its outside; Container 3 front side wall both sides are respectively equipped with the bearing 14 that plugs together mutually with Y shape depression bar 13; One side of bearing 14 is provided with the fixedly rotating shaft 11 of Y shape depression bar 13 1 ends; Opposite side is provided with the fixedly taper bolt 12 of Y shape depression bar 13, and the end of taper bolt 12 is provided with unloader lever 30; Described data acquisition and analytical equipment comprise pressure transducer 5, temperature sensor 25, calibrate AE sensor 26, electromagnetic radiation sensor 27, potentiometric sensor 28 compositions on the left side wall that is located at container 3 successively, and pressure transducer 5, temperature sensor 25, calibrate AE sensor 26, electromagnetic radiation sensor 27, potentiometric sensor 28 link to each other with data collecting instrument 29 through data line respectively; The right side of said container 3 is provided with the observation device of being made up of high-speed camera 23 and glass window 20, and glass window 20 is positioned on the Right Inboard wall of container 3, and high-speed camera 23 is positioned at over against the place ahead of glass window 20.As shown in Figure 2, glass window 20 is installed on the container 3 Right Inboard walls through screw, for guaranteeing sealing, on the mating surface of glass window 20 and chamber wall 3, is provided with O-ring seal, for preventing glass window 20 fragmentations, is provided with guardrail 24 in the outside of glass window 20; The scope that high-speed camera 23 is taken is whole glass window 20, and regulates the distance of video camera and window with this; During test, open high-speed camera 23, note the destructive process of coal sample in the outstanding whole process, analyze the failure law of coal sample under terrestrial stress and gas pressure coupling in the outstanding process.Equipment data acquisition analyzing is made up of pressure transducer 5, temperature sensor 25, calibrate AE sensor 26, electromagnetic radiation sensor 27, potentiometric sensor 28 and data collecting instrument 29.Pressure transducer 5, temperature sensor 25, calibrate AE sensor 26, electromagnetic radiation sensor 27, potentiometric sensor 28 link to each other with data collecting instrument 29 through data line respectively; Gather pressure, temperature, acoustic emission, current potential, electromagnetic radiation data in the experimentation through equipment data acquisition analyzing, each achievement data rule during the research coal is given prominence to gas, and carry out outburst prediction for each index theoretical foundation is provided.
The assay method of coal of the present invention and gas outbursts Prediction index critical value:
(1) chooses representational coal sample at the mine of needs mensuration coal and gas outbursts Prediction index critical value, cut into the device volume size; Perhaps pulverize with comminutor and process with the consistent moulded coal of casing inner product size with broken coal;
(2) open the cover plate 21 of container 3; To test coal sample and put into container 3; Compression leg 1 is passed circular hole that cover plate 21 reserves and pressing plate 2 to link to each other through screw thread; Plug 7 is put into aspis 6; Aspis baffle plate 9 is placed on plug 7 outer ends; Make plug 7 inner equal with container 3 inside surfaces, the outer end closely contacts with aspis baffle plate 9, and the mating surface of aspis baffle plate 9 and container 3 contacts is provided with O-ring seal 8; Rotate Y shape depression bar 13 to bearing 14, taper bolt 12 is inserted in the groove of Y shape depression bar 13 and bearing 14, thereby the bolt of regulating on the Y shape depression bar 13 10 makes aspis baffle plate 9 realize sealing with container 3 tight contacts;
(3) will open with air outlet valve 18 with the gas admittance valve 17 on the reduction valve 15 that gas jar 16 links to each other; Allow methane gas pass through admission piece 4 and get in container 3, the impermeability of inspection container 3 sees if there is gas leakage; Close source of the gas afterwards, promptly close the air outlet valve 18 on the reduction valve 15;
(4) if there is not gas leakage, then to the pressure-loaded device power is provided through pressure testing machine, exerts pressure to coal sample, the size of its pressure is consistent with the mine terrestrial stress size of getting coal sample;
(5) when the mine of applied pressure and getting coal sample terrestrial stress size is consistent; Opening air outlet valve 18 on the reduction valve 15 adjusts air valve 18 and sets and in container 3, charge into methane gas 0.6 ~ 0.8MPa; And adsorb more than 48 hours, allow coal sample fully adsorb, close air outlet valve 18 after absorption is stable;
(6) after the absorption of the coal sample of container (3) is stablized, open high-speed camera 23 and data collecting instrument 29, carry out the preparation before giving prominence to;
(7) give prominence to when starting; Give 30 1 of terminal unloader levers of taper bolt 12 downward impulse force of moment; Taper bolt 12 is come off fast; At this moment; Y shape depression bar 13 1 ends and bearing 14 are fixed an end and are broken away from; Depression bar 13 other ends are around rotating shaft 11 rotation, and aspis baffle plate 9 comes off after losing the pressure of Y shape depression bar 13 automatically, and the coal samples in the container 3 are poured into aspis 6 under the effect of stress and gas.
(8) if record experimental result outstanding, then according to the above-mentioned experimental procedure 1-7 step, reduces the 0.2MPa gas pressure, once more test; If do not give prominence to, then utilize the coal sample of container 3, increase 0.2MPa gas pressure value, according to the experimental procedure 2-7 step, experiment once more repeats so successively; Pressure when supposing to take place to give prominence to is P
2, Tu Chu pressure is not P
1, get intermediate value then and continue experiment, be 0.01MPa up to precision.Then this time the gas pressure value of test is coal and gas outbursts Prediction index critical value.
Claims (4)
1. the determinator of coal and gas outbursts Prediction index critical value; Comprise that antetheca has the container of aspis (6) (3), is located at pressure-loaded device on the container (3), gas-loaded device, outstanding starter gear and equipment data acquisition analyzing respectively; It is characterized in that: described pressure-loaded device is made up of compression leg (1), the pressing plate (2) that is threaded with compression leg (1), is set with cover plate (21) on the compression leg (1); Described gas-loaded device is made up of gas jar (16), reduction valve (15), porous sintered plate (19) and admission piece (4); Admission piece (4) is positioned on the rear wall of container (3), and porous sintered plate (19) is positioned on the inwall of container (3) rear side; Described outstanding starter gear comprises and is located at the outer aspis baffle plate (9) of container (3) front side wall aspis (6), is located at the plug (7) in the aspis (6); The outside of aspis baffle plate (9) is provided with the Y shape depression bar (13) that is pressed in its outside; Container (3) front side wall both sides are respectively equipped with the bearing (14) that plugs together mutually with Y shape depression bar (13); One side of bearing (14) is provided with the fixedly rotating shaft (11) of Y shape depression bar (13) one ends; Opposite side is provided with the fixedly taper bolt (12) of Y shape depression bar (13), and taper bolt 12 ends are provided with unloader lever (30); Described data acquisition and analytical equipment comprise pressure transducer (5), temperature sensor (25), calibrate AE sensor (26), electromagnetic radiation sensor (27), potentiometric sensor (28) composition on the left side wall that is located at container (3) successively, and pressure transducer (5), temperature sensor (25), calibrate AE sensor (26), electromagnetic radiation sensor (27), potentiometric sensor (28) link to each other with data collecting instrument (29) through data line respectively; The right side of said container (3) is provided with the observation device of being made up of high-speed camera (23) and glass window (20), and glass window (20) is positioned on the Right Inboard wall of container (3), and high-speed camera (23) is positioned at over against the place ahead of glass window (20).
2. the determinator of coal according to claim 1 and gas outbursts Prediction index critical value is characterized in that: the mating surface of described cover plate (21) and container (3) and be provided with O-ring seal with the mating surface of compression leg (1).
3. the determinator of coal according to claim 1 and gas outbursts Prediction index critical value; It is characterized in that: described observation device, high-speed camera (23) through container (3) right side and glass window (20) can photograph the evolutionary process of breaking of coal sample in the outstanding whole process.
4. coal and the assay method of gas outbursts Prediction index critical value of device according to claim 1, its characteristic is in comprising the steps:
(1) chooses the coal sample to be measured of moulded coal or diffusing shape;
(2) coal sample of moulded coal or diffusing shape is packed into from the top of container (3) after, the setting pressure charger;
(3) gas admittance valve (17) and the air outlet valve (18) on the reduction valve (15) that will link to each other with gas jar (16) opened; Allowing methane gas pass through admission piece (4) gets in container (3); The impermeability of inspection container (3); See if there is gas leakage; Close source of the gas afterwards, promptly close the air outlet valve (18) on the reduction valve (15);
(4) if there is not gas leakage, then to the pressure-loaded device power is provided through pressure testing machine, exerts pressure to coal sample, the size of its pressure is consistent with the mine terrestrial stress size of getting coal sample;
(5) when the mine of applied pressure and getting coal sample terrestrial stress size is consistent; Opening air outlet valve (18) on the reduction valve (15) adjusts air valve (18) and sets and in container (3), charge into methane gas 0.6～0.8MPa; And adsorb more than 48 hours; Allow the abundant adsorption gas of coal sample, close air outlet valve (18) after absorption is stable;
(6) after the absorption of the coal sample of container (3) is stablized, open the high-speed camera (23) that is located at glass window (20) the place ahead, and turn-on data Acquisition Instrument (29), carry out outstanding preceding preparation;
(7) give (30) one of terminal unloader levers of taper bolt (12) downward impulse force of moment; Taper bolt (12) is come off fast; At this moment; Depression bar (13) one ends and bearing (14) are fixed an end and are broken away from; Depression bar (13) other end rotates around rotating shaft (11); Aspis baffle plate (9) comes off after losing the pressure of depression bar (13) automatically, and the coal sample in the container (3) is poured into aspis (6) under the effect of stress and gas;
If gas and coal sample are given prominence to from aspis (6), then progressively reduce the amount of charging into of methane gas, repeating step (1)～(7), outstanding to straight gas and coal sample, the force value of record gas at this moment;
If gas and coal sample are not given prominence to, then progressively increase the amount of charging into of methane gas, repeating step (3)～(7), outstanding to straight gas and coal sample from aspis (6), the force value of record gas at this moment.
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