CN111927556B - 110 and N00 construction method mining working face goaf gas concentration distribution simulation testing device and using method - Google Patents
110 and N00 construction method mining working face goaf gas concentration distribution simulation testing device and using method Download PDFInfo
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- 238000005065 mining Methods 0.000 title claims abstract description 48
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- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 title claims abstract description 15
- 238000010276 construction Methods 0.000 title claims description 28
- 238000002347 injection Methods 0.000 claims abstract description 80
- 239000007924 injection Substances 0.000 claims abstract description 80
- 238000009423 ventilation Methods 0.000 claims abstract description 34
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- 229910000831 Steel Inorganic materials 0.000 claims description 82
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- 239000003082 abrasive agent Substances 0.000 claims description 3
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- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention provides a 110 and N00 working method mining working face goaf gas concentration distribution simulation test device and a use method thereof, wherein the test device comprises a model frame, a roof stress loading device, a gas injection device, a ventilation device and a gas concentration detection device; the invention can simulate the gas concentration distribution rules of the goaf under two different ventilation systems of working face Y-type ventilation under a 110 mining mode and working face Z-type ventilation under an N00 mining mode, can load the goaf caving body, simulate the internal airflow migration and gas migration of the goaf under the loaded condition, monitor the airflow and gas concentrations in the goaf and a roadway through the infrared gas sensor, analyze data through the data processing system to obtain the gas concentration distribution rules in the goaf and the roadway, and simulate the test result to have guiding significance for researching the gas distribution rules of the goaf and controlling the gas disasters under the cut-top pressure relief mining mode.
Description
Technical Field
The invention relates to the technical field of coal mine roof cutting pressure relief mining, in particular to a 110 and N00 construction method mining working face goaf gas concentration distribution simulation testing device and a using method thereof.
Background
In recent years, with the increasing of the mining depth of mines, disaster accidents caused by the problem of large deformation of surrounding rocks of deep roadways are more serious, the stress concentration of the surrounding rocks is caused by the excavation of coal beds and the arrangement of coal pillars, and the arrangement of the coal pillars is also a waste of coal resources which are consumed day by day. In order to solve the problems, the flood academicians propose a method 110 for retaining the coal pillars according to the theory of the top-cutting short-wall beam, namely that only 1 gate is required to be tunneled for 1 working face, and 0 coal pillars are reserved. In the 110 method, before stoping of a working face, a roadway top plate is supported by an NPR constant-resistance anchor rope, then stress transmission between a roadway and a goaf top plate is cut off by a top plate directional presplitting cutting seam, so that the roadway top plate forms a roof-cutting short-wall beam structure, after stoping of the working face, the top plate automatically collapses along the cutting seam to form a roadway side through support, and the roadway side is used for mining of the next working face, so that only 1 working face is required to be tunneled for non-coal-pillar mining of 1 crossheading. On the basis of the 110 construction method, a longwall mining technology and an equipment system taking the N00 construction method as a core are provided, and the purposes of mining N working faces, tunneling 0 crossheading and reserving 0 coal pillars are achieved. The non-pillar self-tunneling N00 construction method does not need to advance tunnel excavation before working face stoping, utilizes matched core technology equipment, can cut an arc tunnel side and tunnel space at the tail of a coal mining machine while mining coal by the coal mining machine, utilizes key technology to support and pre-split a roof, cuts off stress transmission between a goaf and a tunnel roof, enables the goaf roof to automatically collapse under the action of self weight and mine pressure, fills the goaf by utilizing the crushing and swelling characteristic of rock mass, supports and forms the tunnel side through matched gangue blocking equipment, and is used as a transportation crossheading of the next working face, thereby realizing the integration of non-pillar mining and mining. Compared with the traditional coal pillar mining, the mining mode of roof cutting, pressure relief and roadway retaining (self-forming) solves the waste caused by coal pillar retaining and establishment, reduces roadway tunneling, thereby reducing disaster accidents caused by tunneling and solving the problem of shortage of mine excavation and replacement. Compared with the traditional filling type gob-side entry retaining, the mining mode of the roof cutting pressure relief entry retaining (self-entry retaining) solves the problems of high cost, complex process, high labor intensity and the like of roadside filling, and reduces the pressure of surrounding rock of the roadway.
Under the mining mode of roof cutting release, change traditional mining mode working face U type ventilation into Y type and Z type ventilation, ventilation system's change will influence the regional change of the interior wind flow path line of collecting space area and air leakage absolutely to lead to collecting space area gas concentration distribution to change. In addition, the roof caving characteristics of the roof cutting and pressure relief mining mode are different from those of the traditional mining mode, and due to the fact that the goaf is free of coal pillar support, the broken swelling performance of gangue and left coal in the goaf is different, the porosity and permeability in the goaf are changed, and finally the gas concentration distribution in the goaf is changed. In order to solve the problem of gas disaster in the cut-top pressure relief mining mode, gas in a goaf needs to be extracted, and the key for extracting the gas is to clearly find the gas concentration distribution and enrichment area in the goaf. Under the mining mode, no device for simulating and testing the gas concentration distribution of the goaf in a laboratory exists.
Disclosure of Invention
The invention aims to provide a method and a device for simulating and testing the gas concentration distribution of a mined working face goaf by a 110 and N00 construction method, which can simulate a Y-shaped ventilation system of the working face in a 110 mining mode and a Z-shaped ventilation system of the working face in an N00 mining mode, load the goaf caving body, simulate the air flow migration and the gas migration inside the goaf under the loaded condition, simulate the gas migration rules of the goaf under different gas emission sources and different gas emission strengths, simulate the air flow and the gas concentration in the goaf under the different air distribution amounts, monitor the air flow and the gas concentration in the goaf and a roadway, and provide support for gas extraction.
In order to solve the technical problems, the invention adopts the following technical scheme:
a110 and N00 worker method mining working face goaf gas concentration distribution simulation testing arrangement, including model frame, roof stress loading device, gas injection device, ventilation unit and gas concentration detection device;
the direct lower part of the model frame is a goaf, the model frame is in a cuboid shape, four corners of the bottom of the model frame are respectively provided with a fixed base, a bottom plate of the bottom of the model frame is provided with a plurality of openings, sealing rubber strips are arranged at the openings, detachable hollow transparent plates are arranged at the lower parts of four side surfaces of the model frame, fixed hollow steel plates are arranged at the upper parts of the four side surfaces of the model frame, the contact parts of adjacent fixed hollow steel plates and the detachable hollow transparent plates are hermetically connected through sealant, a fixed wood plate is bonded at the inner side of each fixed hollow steel plate and used for simulating roof plates in a roof cutting and pressure relief goaf, and the model frame is internally filled with grinding materials with different proportions to simulate a caving zone and a fracture zone;
the top plate stress loading device comprises a hydraulic lifting rod, strip steel, a top plate pressurizing device and a hydraulic control console, the hydraulic lifting rod penetrates through an opening in a bottom plate of the model frame and is uniformly connected with the strip steel, the top plate pressurizing device is positioned at the top of the model frame, the top plate pressurizing device comprises a pressurizing device and a pressurizing plate, through holes are uniformly formed in the surface of the pressurizing plate along the direction of the goaf, and the hydraulic control console is used for respectively controlling the hydraulic lifting rod to lift and the top plate pressurizing device to pressurize;
the gas injection device comprises a high-pressure gas cylinder, a gas injection pipeline and a gas emission console, wherein the high-pressure gas cylinder is sequentially connected with a pressure reducing valve, a gas flowmeter and the gas emission console, the gas injection pipeline is a gas emission channel, the gas injection pipeline smoothly penetrates through a through hole on the surface of the pressure plate, the gas emission console is used for simulating different gas emission strengths, the gas emission console consists of a console No. 1, a console No. 2 and a console No. 3, the console No. 1 is connected with a gas injection port No. 1 to simulate the emission of coal gas, the console No. 2 is connected with a gas injection port No. 2 to simulate the emission of coal wall and a goaf bottom plate, and the console No. 3 is connected with a gas injection port No. 3 and a gas injection port No. 4 to respectively simulate the emission of gas with a caving zone and the emission of gas with a fracture zone;
the ventilation device comprises a variable ventilation system and an adjustable ventilator, the variable ventilation system is positioned at the front part of the goaf, the variable ventilation system comprises a main air inlet lane, a first air inlet lane, a second air inlet lane, an air return lane and a working surface, a first valve is arranged in the first air inlet lane, a second valve is arranged in the second air inlet lane, Y-shaped and Z-shaped ventilation systems of the working surface can be simulated through the first valve and the second valve, and the adjustable ventilator is used for changing the air supply quantity of the working surface;
the gas concentration detection device comprises an infrared gas sensor, a data acquisition system and a data processing system.
Further, can dismantle the cavity transparent plate and divide into inside and outside both sides, the inboard aperture of having arranged evenly distributed supplies the gas loss, and No. 1 gas injection mouth has been seted up to the outside.
Furthermore, a plurality of steel bars are horizontally and uniformly arranged in the goaf, the right sides of the steel bars are close to the fixed wood boards, the right side of the upper surface of each steel bar is bonded with a descending wood board which has the same width as the steel bars and the same height as the working surface, the descending wood board descends along with the steel bars to form a lane, the descending wood board and the fixed wood boards form a lane in the goaf after mining is completed, and form a passage with the working surface, the main air inlet lane, the first air inlet lane and the second air inlet lane, small holes are uniformly arranged between the upper surface of each steel bar and the contact surface of the steel bars and the steel bars respectively, the lower surface of the steel bar is supported by a hydraulic lifting rod, the steel bars are close to the steel bars, the holes are communicated, and the front surface of the steel bar positioned at the forefront of the goaf is provided with a No. 2 gas injection port.
Further, the gas injection pipeline is formed by nesting an inner pipe and an outer pipe, the surfaces of the inner pipe and the outer pipe are respectively provided with uniformly distributed small holes, a plurality of infrared gas sensors are uniformly bonded to the opposite sides of the small holes at the bottom of the outer pipe, one side of the inner pipe is tightly attached to the outer pipe and aligned with the orifice of the outer pipe, a sealing strip is bonded to the bottom of the inner pipe and used for separating the outer pipe, the upper portion of the outer pipe is provided with a No. 3 gas injection port, the No. 3 gas injection port is connected with a No. 3 control console through the small holes below the sealing strip to release gas and is used for simulating gas emission in a falling zone, the other side surface of the inner pipe is provided with scales, and the upper portion of the inner pipe is provided with a No. 4 gas injection port and is connected with the No. 3 control console through the small holes above the sealing strip to release gas and is used for simulating gas emission in a crack zone.
Furthermore, the arrangement of the infrared gas sensors can fully reflect the gas concentration distribution rule along the trend and the trend of the working face and among different heights of the goaf, and the infrared gas sensors are uniformly arranged into three layers, namely a bottom layer, a middle layer and a top layer from bottom to top.
Furthermore, the adjustable ventilator is connected with the main air inlet lane, and the main air inlet lane, the first air inlet lane, the second air inlet lane, the return air lane and the working face are formed by bonding transparent plates.
The use method of the device for simulating and testing the gas concentration distribution of the mined-out area of the working face under the 110 and N00 construction methods comprises the following steps:
(1) connecting a data processing system, a data acquisition system and an infrared gas sensor, connecting a hydraulic control console with a top plate pressurizing device and a hydraulic lifting rod, operating the hydraulic control console to lift the hydraulic lifting rod to enable the steel bars in the goaf to be located at a proper initial height, vertically inserting a gas injection pipeline to enable the steel bars to be uniformly distributed in the goaf, filling the prepared grinding materials with different proportions into the goaf, installing the top plate pressurizing device on the top of a model frame, sequentially connecting a high-pressure gas cylinder, a pressure reducing valve, a gas flowmeter and a gas emission control console, connecting the control console No. 1, the control console No. 2 and the control console No. 3 with the gas injection port No. 1, the gas injection port No. 2, the gas injection port No. 3 and the gas injection port No. 4 respectively, and opening an adjustable ventilator, a first valve and a second valve;
(2) opening a console No. 2, closing the console No. 1 and the console No. 3, after a period of time, enabling a hydraulic lifting rod to descend at intervals by adjusting the hydraulic control console, simultaneously controlling a pressurizing device to simulate and compensate disturbance caused by self gravity and mining of an overlying rock mass, and simulating a coal mining process, wherein after a first steel bar falls, gas is gushed from small holes in the upper surface of the first steel bar and small holes in the side surface of a second steel bar until the steel bars all fall to be communicated with a first air inlet lane, a second air inlet lane and a retained lane, so that a Y-shaped ventilation mode is formed;
(3) opening a data acquisition system, obtaining the gas concentration of the goaf in a working face Y-shaped ventilation mode through infrared gas sensors in the goaf and the retained roadway, transmitting the data into a data processing system for analysis, and obtaining the gas concentration distribution rule of the goaf when the coal wall and the bottom plate of the goaf are gas emission sources under the roof cutting and pressure relief 110 method;
(4) keeping the step (1) unchanged, closing the console No. 1, closing the console No. 2 and the console No. 3 at the step (2) until the bar steel falls down completely, then only opening the console No. 1, discharging gas into the goaf through the gas injection port No. 1, and obtaining the gas concentration distribution rule of the goaf when the coal left under the roof-cutting pressure relief 110 method is a gas discharge source through a gas concentration detection device;
(5) keeping the step (1) unchanged, closing the console No. 1 and the console No. 2 at the step (2), controlling the console No. 3 to enable gas to pass through the gas injection port No. 3 and keep the gas injection port No. 4 closed, controlling the hydraulic console until all steel bars fall down after a period of time, and then obtaining the gas concentration distribution rule of the goaf when the caving zone under the cut-top pressure relief 110 construction method is a gas emission source through a gas concentration detection device;
(6) keeping the step (1) unchanged, closing the console No. 1 and the console No. 2 at the step (2), enabling gas to pass through the gas injection port No. 4 by controlling the console No. 3, keeping the gas injection port No. 3 closed, controlling the hydraulic console until all steel bars fall down after a period of time, and then obtaining the gas concentration distribution rule of the goaf when the fracture zone under the roof-cutting pressure relief 110 construction method is a gas emission source through a gas concentration detection device.
Further, the air conditioner is provided with a fan,
in the step (1), the first valve is opened, the second valve is closed at the same time, and the ventilation mode of the working surface is changed into a Z shape;
the steps (2) and (3) are unchanged, and a goaf gas concentration distribution rule is obtained when the coal wall and the goaf floor are gas emission sources under the roof cutting pressure relief N00 working method;
obtaining a gas concentration distribution rule of the goaf when the residual coal under the roof cutting pressure relief N00 construction method is a gas emission source without changing the step (4);
step (5), obtaining a gas concentration distribution rule of the goaf when the caving zone under the roof cutting pressure relief N00 construction method is a gas emission source;
and (6) obtaining the gas concentration distribution rule of the goaf when the fracture zone under the roof-cutting pressure relief N00 construction method is a gas emission source without changing.
Further, the air conditioner is provided with a fan,
in the step (1), the adjustable ventilator is opened, the first valve and the second valve are adjusted, the total air inlet lane air quantity and the first air inlet lane air quantity and the second air inlet lane air quantity at the moment are recorded, a gas concentration distribution rule is obtained through the gas concentration detection device after all strip steel falls, then the adjustable ventilator is adjusted to change the total air inlet quantity, the air distribution ratio of the first air inlet lane and the second air inlet lane is kept unchanged, or the total air inlet quantity is kept unchanged, the air distribution ratio of the first air inlet lane and the second air inlet lane is changed, the goaf gas concentrations under the conditions of different air inlet quantities and different air distribution ratios are respectively recorded, and the goaf gas concentration distribution rule under the conditions of different air inlet quantities and different air distribution ratios is obtained.
Further, the air conditioner is provided with a fan,
in the step (2), the control console No. 2 is opened, the control console No. 1 and the control console No. 3 are closed, the control console No. 2 is adjusted to control the gas emission intensity of the coal wall and the bottom plate of the gob and record data, the gas concentration distribution rule of the gob under the gas emission intensity is obtained through a gas concentration detection device, then the control console No. 2 is adjusted to change the gas emission intensity of the coal wall and the bottom plate of the gob and record data again, and the obtained gas concentration distribution of the gob is compared with the obtained data to obtain the gas concentration distribution rule of the gob under different gas emission intensities.
Compared with the prior art, the invention has the beneficial effects that:
the invention aims to provide a device for simulating and testing the gas concentration distribution of a mined-out working face goaf by a 110 and N00 construction method and a using method thereof, which can simulate the gas concentration distribution laws of the goaf under two different ventilation systems of Y-shaped ventilation of a working face under a 110 mining mode and Z-shaped ventilation of the working face under an N00 mining mode, can load a goaf caving body, simulate the internal air flow migration and gas migration of the goaf under a loaded condition, can simulate the gas migration laws of the goaf under different gas emission sources including a coal wall, residual coal, an upper adjacent layer, a middle upper adjacent layer and different gas emission strengths, can simulate the internal air flow and gas concentration of the goaf under different air distribution conditions, can monitor the air flow and gas concentration in a roadway and the goaf through an infrared gas sensor, can analyze data through a data processing system to obtain the gas concentration distribution laws of the goaf and the roadway, the experimental model not only solves the experimental model of mining the goaf on the working face by the 110 and N00 construction methods in the cut-top pressure relief mining mode, but also obtains the gas concentration distribution of the goaf under different gas emission sources and different air distribution quantities of the model, and the simulation test result has guiding significance for researching the gas distribution rule and gas disaster control of the goaf in the cut-top pressure relief mining mode.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a face gob of the present invention;
FIG. 3 is a schematic view of a gas injection line according to the present invention;
FIG. 4 is a sectional view showing the arrangement of the measuring points according to the present invention.
Description of the drawings: 1. the device comprises a model frame, 2, a goaf, 3, a hydraulic lifting rod, 4, a steel bar, 5, a top plate pressurizing device, 6, a hydraulic control console, 7, a pressurizing plate, 8, a high-pressure gas cylinder, 9, a gas injection pipeline, 10, a gas burst control console, 11, a pressure reducing valve, 12, a gas flowmeter, 13, a control console No. 1, 14, a control console No. 2, a control console No. 15, a control console No. 3, a gas injection port No. 16, a gas injection port No. 1, a gas injection port No. 17, a gas injection port No. 2, a gas injection port No. 18, a gas injection port No. 3, a gas injection port No. 19, a gas injection port No. 4, an adjustable ventilator, 21, a main air inlet lane, 22, a first air inlet lane, 23, a second air inlet lane, 24, a return air lane, 25, a working face, 26, a first valve, 27, a second valve, 28, an infrared gas sensor, 29, a data acquisition system, 30, a data processing system, 31, a fixed wood board, 32, a descending wood board, 33, a reserved lane, 34, an inner pipe, 35, Outer tube, 36, sealing strip, 37, bottom layer, 38, middle layer, 39, top layer.
Detailed Description
As shown in figures 1-4, a simulation test device for gas concentration distribution in a mined-out face goaf by a 110 and N00 construction method comprises a cuboid model frame 1, the length, the width and the height of the cuboid model frame 1 are 3000mm, 2100mm and 1500mm, fixed bases are arranged at four corners of the bottom of the model frame 1, the peripheral side surface of the model frame 1 is divided into an upper part and a lower part, the upper part is a fixed hollow steel plate, the lower part is a detachable hollow transparent plate, the contact part of the adjacent fixed hollow steel plates and the detachable hollow transparent plates are hermetically connected through sealants to ensure the air tightness of the model frame 1, a fixed wood plate 31 is bonded on the inner side of the fixed hollow steel plate of the model frame 1 and used for simulating a roof in a roof-cutting goaf pressure-relieving goaf reserved lane 33, the bonding height of the fixed wood plate 31 is a mining height, the right lower part of the model frame 1 is a goaf 2, the goaf 2 comprises a strip steel 4 which completely falls, and the horizontal part, a pressure-relieving part is arranged in the reserved lane 33 along the goaf 2, Infrared gas sensors 28 are laid in the vertical direction and used for monitoring the gas concentration in real time; a bottom plate at the bottom of the model frame 1 is provided with a hole for the hydraulic lifting rod 3 to pass through, and sealing rubber strips are arranged at the holes; before the experiment begins, a hydraulic control platform 6 is connected with a hydraulic lifting rod 3 and a top plate pressurizing device 5, the hydraulic control platform 6 is adjusted to enable the hydraulic lifting rod 3 to rise to a mining height, and the upper part of the hydraulic lifting rod 3 is paved with a steel bar 4 which can stably descend to the foremost part of a working surface 25 along with the hydraulic lifting rod 3 to serve as a coal wall; the gas injection pipeline 9 penetrates through the pressurizing plate 7 and is vertically placed on the bar steel 4, abrasive materials with different proportions are filled in the model frame 1 to simulate an overflow zone and a fracture zone, and the data processing system 30, the data acquisition system 29 and the infrared gas sensor 28 are connected for monitoring and analyzing the gas concentration change rule of the goaf in real time; connect high-pressure gas cylinder 8, relief pressure valve 11, gas flowmeter 12 and gas gush out control cabinet 10 in proper order, be connected 1 control cabinet 13 with gas injection mouth 16 No. 1, be connected 2 control cabinet 14 with gas injection mouth 17 No. 2, be connected 3 control cabinet 15 with gas injection mouth 18 No. 3 and gas injection mouth 19 No. 4, gas gush out control cabinet 10 can control different gas gush out intensity.
Wherein, a plurality of steel bars 4 are horizontally and evenly arranged in the goaf 2, the right side is adjacent to the fixed wood plate 31, the right side of the upper surface of each steel bar is bonded with a descending wood plate 32 which has the same width as the steel bar and the same height as the working surface, the descending wood plate 32 descends along with the steel bars 4 to form a roadway wall, the descending wood plate 32 and the fixed wood plate 31 form a roadway 33 in the goaf 2 after mining is finished, and the upper surface of each strip steel 4 and the contact surface of the strip steel 4 and the strip steel 4 are uniformly provided with small holes, the lower surface of each strip steel 4 is supported by a hydraulic lifting rod 3, two adjacent strip steels 4 are abutted and have through holes, and the front surface of the strip steel 4 positioned at the forefront of the goaf 2 is provided with a No. 2 gas injection port 17 which is connected with a No. 2 console 14 and used for simulating gas emission from a coal wall and a bottom plate of the goaf 2.
Wherein, gas injection pipeline 9 is formed by inner tube 34 and outer tube 35 nestification, inner tube 34 and outer tube 35 surface are equipped with evenly distributed's aperture respectively, outer tube 35 bottom aperture evenly bonds infrared gas sensor 28 to the face, inner tube 34 cloth hole one side is hugged closely outer tube 35 and is aimed at with outer tube 35 drill way, inner tube 34 bottom bonds has sealing strip 36 to be used for separating outer tube 35, outer tube 35 upper portion is equipped with No. 3 gas injection mouth 18 and is connected the aperture release gas and be used for simulating the area gas of falling and gushing out below sealing strip 36 with No. 3 control cabinet 15, inner tube 34 opposite side surface is equipped with the scale, inner tube 34 upper portion is equipped with No. 4 gas injection mouth 19 and is connected the aperture release gas and be used for simulating the crack area gas of gushing out through sealing strip 36 above with No. 3 control cabinet 15.
The infrared gas sensors 28 are uniformly arranged in a goaf 2, 4 rows are arranged at a bottom layer 37, the number of each row is 5, the number of the measuring points is 20, the arrangement modes of a middle layer 38 and a top layer 39 are the same as that of the bottom layer, the total number of three layers of measuring points in the goaf is 60, the infrared gas sensors 28 are uniformly arranged in a retained roadway 33, 2 rows are arranged at the bottom layer 37, the number of each row is 5, the total number of 10 measuring points is 10, the arrangement modes of the middle layer 38 and the top layer 39 are the same as that of the bottom layer, the total number of three layers of measuring points in the retained roadway is 30, and the number of the measuring points arranged in a model frame 1 is 90.
The adjustable ventilator 20 in the ventilation device is connected with the main air inlet lane 21, and the main air inlet lane 21, the first air inlet lane 22, the second air inlet lane 23, the return air lane 24 and the working surface 25 are formed by bonding transparent plates.
The application method of the simulation test device for the gas concentration distribution of the mined-out area 24 of the working face 29 mined by the 110 and N00 construction methods comprises the following steps:
(1) connecting a data processing system 30, a data acquisition system 29 and an infrared gas sensor 28, connecting a hydraulic control console 6 with a roof pressurizing device 5 and a hydraulic lifting rod 3, operating the hydraulic control console 6 to lift the hydraulic lifting rod 3 to enable the steel bars 4 in the goaf 2 to be positioned at a proper initial height, vertically inserting the steel bars into an air injection pipeline 9 to enable the steel bars to be uniformly distributed in the goaf 2, filling the prepared abrasives in different proportions into the goaf 2, a top plate pressurizing device 5 is installed at the top of a model frame 1, a high-pressure gas cylinder 8, a pressure reducing valve 11, a gas flowmeter 12 and a gas emission console 10 are sequentially connected, a console No. 1 13, a console No. 2 14 and a console No. 3 15 are respectively connected with a gas injection port No. 1 16, a gas injection port No. 2 17, a gas injection port No. 3, a gas injection port No. 4 19, and an adjustable ventilator 20, a first valve 26 and a second valve 27 are opened;
(2) opening a console 14 No. 2, closing a console 13 No. 1 and a console 15 No. 3, after a period of time, enabling a hydraulic lifting rod 3 to descend at intervals of a period of time by adjusting a hydraulic control console 6, simultaneously controlling a pressurizing device to simulate and compensate disturbance caused by self gravity and mining of an overlying rock mass, simulating a coal mining process, and after a first steel bar falls, gas gushes out from small holes in the upper surface of the first steel bar and small holes in the side surface of a second steel bar until the steel bars all fall to be communicated with a first air inlet lane 22, a second air inlet lane 23 and a retained lane 33 to form a Y-shaped ventilation mode;
(3) opening a data acquisition system 29, obtaining the gas concentration of the gob 2 under the working face 25Y-shaped ventilation mode through an infrared gas sensor 28 in the gob 2 and the entry retaining 33, transmitting the data into a data processing system 30 for analysis, and obtaining the gas concentration distribution rule of the gob 2 when the coal wall and the bottom plate of the gob 2 are gas emission sources under the roof cutting pressure relief 110 method;
(4) keeping the step (1) unchanged, closing a console 13 No. 1, closing a console 14 No. 2 and a console 15 No. 3 at the step (2) until the bar steel 4 falls down completely, then only opening the console 13 No. 1, allowing gas to gush out into the gob 2 through a gas injection port 16 No. 1, and obtaining a gas concentration distribution rule of the gob 2 when the residual coal under the roof cutting pressure relief 110 method is a gas gush source through a gas concentration detection device;
(5) keeping the step (1) unchanged, closing a console No. 1 13 and a console No. 2 14 at the step (2), controlling a console No. 3 15 to enable gas to be kept closed through a gas injection port No. 3 18 and a gas injection port No. 4 19, controlling a hydraulic console 6 after a period of time until steel bars fall completely, and then obtaining a gas concentration distribution rule of a goaf 2 when a roof-cutting pressure relief 110 construction method falling zone is a gas emission source through a gas concentration detection device;
(6) keeping the step (1) unchanged, closing a console No. 1 13 and a console No. 2 14 at the step (2), controlling a console No. 3 15 to enable gas to be kept closed through a gas injection port No. 4 19 and a gas injection port No. 3 18, controlling a hydraulic console 6 after a period of time until steel bars fall completely, and then obtaining a gas concentration distribution rule of a goaf 2 when a fracture zone under a roof-cutting pressure relief 110 construction method is a gas emission source through a gas concentration detection device.
Wherein the content of the first and second substances,
in the step (1), the first valve 26 is opened, the second valve 27 is closed at the same time, and the ventilation mode of the working surface 25 is changed into a Z shape;
the steps (2) and (3) are unchanged, and a gas concentration distribution rule of the gob 2 is obtained when the coal wall and the bottom plate of the gob 2 are gas emission sources under the roof cutting pressure relief N00 construction method;
the step (4) is unchanged, and a gas concentration distribution rule of the goaf 2 is obtained when the residual coal under the roof cutting pressure relief N00 construction method is a gas emission source;
step (5), obtaining a gas concentration distribution rule of the goaf 2 when the caving zone under the roof cutting pressure relief N00 construction method is a gas emission source;
and (6) obtaining the gas concentration distribution rule of the goaf 2 when the fracture zone under the roof cutting pressure relief N00 construction method is a gas emission source without changing.
In the step (1), the adjustable ventilator 20 is opened, the first valve 26 and the second valve 27 are adjusted, the air volume of the total air inlet lane 21 and the air volume of the first air inlet lane 22 and the second air inlet lane 23 are recorded, when the strip steel 4 falls completely, the gas concentration distribution rule is obtained through the gas concentration detection device, then the adjustable ventilator 20 is adjusted to change the total air inlet volume, the air distribution ratio of the first air inlet lane 22 and the second air inlet lane 23 is kept unchanged, or the total air inlet volume is kept unchanged, the air distribution ratio of the first air inlet lane 22 and the second air inlet lane 23 is changed, the goaf 2 gas concentrations under the conditions of different air inlet volumes and different air distribution ratios are respectively recorded, and the goaf 2 gas concentration distribution rule under the conditions of different air inlet volumes and different air distribution ratios is obtained.
In the step (2), the control console 14 No. 2 is opened, the control consoles No. 1 and No. 3 are closed, the control console 14 No. 2 is adjusted to control the gas emission intensity of the coal wall and the bottom plate of the goaf 2 and record data, the gas concentration distribution rule of the goaf 2 under the gas emission intensity is obtained through the gas concentration detection device, then the control console 14 No. 2 is adjusted to change the gas emission intensity of the coal wall and the bottom plate of the goaf 2 and record data again, the obtained gas concentration distribution of the goaf 2 is compared with the obtained data, and the gas concentration distribution rule of the goaf 2 under different gas emission intensities is obtained.
Claims (10)
1. The utility model provides a 110 and N00 worker method mining work face goaf gas concentration distribution simulation testing arrangement which characterized in that: the device comprises a model frame (1), a top plate stress loading device, a gas injection device, a ventilation device and a gas concentration detection device;
the mining goaf-cutting simulation model is characterized in that a goaf (2) is arranged right below a model frame (1), the model frame (1) is in a cuboid shape, four corners of the bottom of the model frame (1) are respectively provided with a fixed base, a plurality of openings are formed in a bottom plate of the model frame (1), sealing rubber strips are arranged at the openings, detachable hollow transparent plates are arranged at the lower parts of four side surfaces of the model frame (1), fixed hollow steel plates are arranged at the upper parts of the four side surfaces of the model frame (1), the contact parts of adjacent fixed hollow steel plates and the detachable hollow transparent plates are hermetically connected through sealing glue, a fixed wood plate (31) is bonded on the inner side of each fixed hollow steel plate and used for simulating an inner top plate of a roadway (33) of the goaf (2) in a roof-cutting and pressure-releasing mode, and different proportions of grinding materials are filled in the model frame (1) to simulate an caving zone and a fracture zone;
the roof stress loading device comprises a hydraulic lifting rod (3), strip steels (4), a roof pressurizing device (5) and a hydraulic control console (6), the hydraulic lifting rod (3) penetrates through an opening in a bottom plate of the model frame (1) and is uniformly connected with the strip steels (4), the roof pressurizing device (5) is positioned at the top of the model frame (1), the roof pressurizing device (5) comprises a pressurizing device and a pressurizing plate (7), through holes are uniformly formed in the surface of the pressurizing plate (7) along the trend of the goaf (2), and the hydraulic control console (6) is used for respectively controlling the hydraulic lifting rod (3) to lift and the roof pressurizing device (5) to pressurize;
the gas injection device comprises a high-pressure gas cylinder (8), a gas injection pipeline (9) and a gas emission control console (10), the high-pressure gas cylinder (8) is sequentially connected with a pressure reducing valve (11), a gas flowmeter (12) and the gas emission control console (10), the gas injection pipeline (9) is a gas emission channel, the gas injection pipeline (9) smoothly passes through a through hole on the surface of a pressure plate (7), the gas emission control console (10) is used for simulating different gas emission intensities, the gas emission control console (10) is composed of a control console (13) No. 1, a control console (14) No. 2 and a control console (15) No. 3, the control console (13) No. 1 is connected with a gas injection port (16) to simulate the emission of residual coal gas, the control console (14) No. 2 is connected with a gas injection port (17) to simulate a coal wall and a gas emission zone (2) bottom plate, the control console (15) No. 3 is connected with a gas injection port (18) No. 3) and a gas injection port (19) No. 4 to simulate the emission of a gas emission zone with a gas emission zone Discharging;
the ventilation device comprises a variable ventilation system and an adjustable ventilator (20), the variable ventilation system is positioned at the front part of the goaf (2), the variable ventilation system comprises a main air inlet lane (21), a first air inlet lane (22), a second air inlet lane (23), an air return lane (24) and a working surface (25), a first valve (26) is arranged in the first air inlet lane (22), a second valve (27) is arranged in the second air inlet lane (23), Y-shaped and Z-shaped ventilation systems of the working surface (25) can be simulated through the first valve (26) and the second valve (27), and the adjustable ventilator (20) is used for changing the air supply quantity of the working surface (25);
the gas concentration detection device comprises an infrared gas sensor (28), a data acquisition system (29) and a data processing system (30).
2. The simulation test device for the gas concentration distribution in the goaf area of the 110 and N00 working method as claimed in claim 1, wherein: can dismantle cavity transparent plate divide into inside and outside both sides, evenly distributed's aperture has been arranged to the inboard and has been supplied the gas loss, and No. 1 gas injection mouth (16) have been seted up to the outside.
3. The simulation test device for the gas concentration distribution in the goaf area of the 110 and N00 working method as claimed in claim 1, wherein: the plurality of the bar steels (4) are horizontally and uniformly arranged in the goaf (2), the right sides of the bar steels (4) are adjacent to the fixed wood plates (31), the right side of the upper surface of each bar steel (4) is bonded with a descending wood plate (32) which has the same width as the bar steel (4) and the same height as the working surface (25), the descending wood plate (32) descends along with the bar steel (4) to form a roadway side, the descending wood plate and the fixed wood plates (31) form a roadway (33) in the goaf (2) after mining is finished, and a passage is formed by the air inlet and the working surface (25), the main air inlet lane (21), the first air inlet lane (22) and the second air inlet lane (23), small holes are uniformly distributed between the upper surface of each strip steel (4) and the contact surface of the strip steel (4) and the strip steel (4), the lower surface of the strip steel (4) is supported by a hydraulic lifting rod (3), the strip steel (4) is abutted against the strip steel (4), the holes are communicated, and a No. 2 air injection port (17) is formed in the front surface of the strip steel (4) positioned at the forefront of the goaf (2).
4. The simulation test device for the gas concentration distribution in the goaf area of the 110 and N00 working method as claimed in claim 1, wherein: the gas injection pipeline (9) is formed by nesting an inner pipe (34) and an outer pipe (35), the surfaces of the inner pipe (34) and the outer pipe (35) are respectively provided with uniformly distributed small holes, a plurality of infrared gas sensors (28) are uniformly adhered to the opposite side of the small holes at the bottom of the outer pipe (35), one side of the inner pipe (34) with holes is tightly adhered to the outer pipe (35) and aligned with the hole opening of the outer pipe (35), a sealing strip (36) is adhered to the bottom of the inner pipe (34) for separating the outer pipe (35), the upper part of the outer pipe (35) is provided with a No. 3 gas injection port (18), the No. 3 gas injection port (18) is connected with a No. 3 console (15) and releases gas through the small holes below the sealing strip (36) and is used for simulating the gas emission of a falling zone, and the other side surface of the inner pipe (34) is provided with scales, the upper part of the inner pipe (34) is provided with a No. 4 gas injection port (19) which is connected with a No. 3 console (15) and used for releasing gas through a small hole above a sealing strip (36) and simulating gas emission in a fissure zone.
5. The simulation test device for the gas concentration distribution in the goaf area of the 110 and N00 working method as claimed in claim 1, wherein: the arrangement of the infrared gas sensors (28) can fully reflect the trend and the trend of the working face (25) and the gas concentration distribution rule among different heights of the goaf (2), and three layers, namely a bottom layer (37), a middle layer (38) and a top layer (39) are uniformly arranged on the infrared gas sensors (28) from bottom to top.
6. The simulation test device for the gas concentration distribution in the goaf area of the 110 and N00 working method as claimed in claim 1, wherein: the adjustable ventilator (20) is connected with the main air inlet lane (21), and the main air inlet lane (21), the first air inlet lane (22), the second air inlet lane (23), the return air lane (24) and the working face (25) are formed by bonding transparent plates.
7. The use method of the device for simulating and testing the gas concentration distribution in the goaf of the working face under the working method of 110 and N00 as claimed in any one of claims 1 to 6, comprising the following steps:
(1) connecting a data processing system (30), a data acquisition system (29) and an infrared gas sensor (28), connecting a hydraulic control console (6) with a roof pressurizing device (5) and a hydraulic lifting rod (3), operating the hydraulic control console (6) to lift the hydraulic lifting rod (3) to enable the steel bars (4) in the goaf (2) to be located at a proper initial height, vertically inserting an air injection pipeline (9) to enable the steel bars to be uniformly distributed in the goaf (2), filling the prepared abrasive materials with different proportions into the goaf (2), installing the roof pressurizing device (5) at the top of a model frame (1), sequentially connecting a high-pressure gas cylinder (8), a pressure reducing valve (11), a gas flowmeter (12) and a gas emission control console (10), and respectively connecting the control console No. 1 (13), the control console No. 2 (14) and the control console No. 3 (15) with a gas injection port (16), The No. 2 gas injection port (17) is connected with the No. 3 gas injection port (18) and the No. 4 gas injection port (19), and the adjustable ventilator (20) and the first valve (26) and the second valve (27) are opened;
(2) opening a console (14) No. 2, closing a console (13) No. 1 and a console (15) No. 3, after a period of time, descending the hydraulic lifting rod (3) at intervals by adjusting the hydraulic control console (6), simultaneously controlling a pressurizing device to simulate and compensate disturbance caused by the self gravity and mining of the overlying rock mass, simulating a coal mining process, and after a first steel bar falls, gas rushes out from small holes in the upper surface of the first steel bar and small holes in the side surface of a second steel bar until the steel bars all fall to be communicated with a first air inlet lane (22), a second air inlet lane (23) and a retained lane (33) to form a Y-shaped ventilation mode;
(3) opening a data acquisition system (29), obtaining the gas concentration of the goaf (2) in a Y-shaped ventilation mode of a working surface (25) through infrared gas sensors (28) in the goaf (2) and the entry retaining (33), transmitting the data into a data processing system (30) for analysis, and obtaining the gas concentration distribution rule of the goaf (2) when the coal wall and the bottom plate of the goaf (2) are gas emission sources under the roof cutting and pressure relief 110 method;
(4) keeping the step (1) unchanged, closing the console (13) No. 1, closing the console (14) No. 2 and the console (15) No. 3 at the step (2) until the bar steel (4) falls completely, then only opening the console (13) No. 1, discharging gas into the goaf (2) through the gas injection port (16) No. 1, and obtaining the gas concentration distribution rule of the goaf (2) when the coal left under the roof-cutting pressure relief 110 method is a gas discharge source through a gas concentration detection device;
(5) keeping the step (1) unchanged, closing a console No. 1 (13) and a console No. 2 (14) at the step (2), controlling a console No. 3 (15) to enable gas to pass through a gas injection port No. 3 (18) and a gas injection port No. 4 (19) to be kept closed, controlling a hydraulic console (6) after a period of time until all steel bars fall down, and then obtaining a gas concentration distribution rule of a goaf (2) when a roof-cutting pressure relief 110 construction method fall zone is a gas emission source through a gas concentration detection device;
(6) keeping the step (1) unchanged, closing a console No. 1 (13) and a console No. 2 (14) at the step (2), controlling a console No. 3 (15) to enable gas to pass through a gas injection port No. 4 (19), keeping a gas injection port No. 3 (18) closed, controlling a hydraulic console (6) after a period of time until steel bars fall completely, and then obtaining a gas concentration distribution rule of a goaf (2) when a fracture zone under a roof cutting and pressure relief 110 construction method is a gas emission source through a gas concentration detection device.
8. The use method of the device for simulating and testing the gas concentration distribution in the goaf of the working face under the 110 and N00 working methods as claimed in claim 7, wherein:
in the step (1), the first valve (26) is opened, the second valve (27) is closed at the same time, and the ventilation mode of the working surface (25) is changed into a Z shape;
the steps (2) and (3) are unchanged, and a gas concentration distribution rule of the goaf (2) is obtained when the coal wall and the bottom plate of the goaf (2) are gas emission sources under the roof cutting pressure relief N00 method;
the step (4) is unchanged, and a gas concentration distribution rule of the goaf (2) is obtained when the residual coal under the roof cutting pressure relief N00 construction method is a gas emission source;
step (5), obtaining the gas concentration distribution rule of the goaf (2) when the caving zone under the roof cutting pressure relief N00 construction method is a gas emission source;
and (6) obtaining the gas concentration distribution rule of the goaf (2) when the fracture zone under the roof-cutting pressure relief N00 construction method is a gas emission source without changing.
9. The use method of the device for simulating and testing the gas concentration distribution in the goaf of the working face under the 110 and N00 working methods as claimed in claim 7, wherein: in the step (1), an adjustable ventilator (20) is opened, a first valve (26) and a second valve (27) are adjusted, the air volume of a total air inlet lane (21) and the air volume of a first air inlet lane (22) and a second air inlet lane (23) are recorded at the moment, when the strip steel (4) falls completely, a gas concentration distribution rule is obtained through a gas concentration detection device, then the adjustable ventilator (20) is adjusted to change the total air inlet volume, the air distribution ratio of the first air inlet lane (22) and the second air inlet lane (23) is kept unchanged, or the total air inlet volume is kept unchanged, the air distribution ratio of the first air inlet lane (22) and the second air inlet lane (23) is changed, the gas concentrations of the goaf (2) under the conditions of different air inlet volumes and different air distribution ratios are recorded respectively, and the gas concentration distribution rule of the goaf (2) under the conditions of different air inlet volumes and different air distribution ratios is obtained.
10. The use method of the device for simulating and testing the gas concentration distribution in the goaf of the working face under the 110 and N00 working methods as claimed in claim 7, wherein: in the step (2), a control console (14) No. 2 is opened, a control console No. 1 (13) and a control console No. 3 (15) are closed, the control console No. 2 (14) is adjusted to control the gas emission intensity of the coal wall and the bottom plate of the goaf (2) and record data, the gas concentration distribution rule of the goaf (2) under the gas emission intensity is obtained through a gas concentration detection device, then the control console No. 2 (14) is adjusted to change the gas emission intensity of the coal wall and the bottom plate of the goaf (2) and record data again, the obtained gas concentration distribution of the goaf (2) is compared with the obtained data, and the gas concentration distribution rule of the goaf (2) under different gas emission intensities is obtained.
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| CN102345469B (en) * | 2010-08-05 | 2013-12-04 | 太原理工大学 | Test analog device for studying gas migration in mined-out area under different ventilation conditions |
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