CN111485948B - Large-dip-angle high-gas coal seam adjacent goaf disaster cooperative prevention and control method - Google Patents
Large-dip-angle high-gas coal seam adjacent goaf disaster cooperative prevention and control method Download PDFInfo
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- 230000002265 prevention Effects 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 100
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 32
- 238000000605 extraction Methods 0.000 claims abstract description 24
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 238000009826 distribution Methods 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 239000011435 rock Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 230000008093 supporting effect Effects 0.000 claims description 10
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- 230000003014 reinforcing effect Effects 0.000 claims 1
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- 238000010586 diagram Methods 0.000 description 11
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- 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 discloses a large dip angle high gas coal seam adjacent goaf disaster cooperative prevention and control method, which is mainly used for predicting, reasonably determining air quantity, ventilation form and propulsion speed according to mining conditions and gas emission quantity in the aspect of gas, preferably selecting an extraction method, and efficiently treating gas; in the aspect of coal spontaneous combustion, the spontaneous combustion characteristic of coal is determined through experiments, and a fire prevention method is formulated from two aspects of oxygen control and time control on the basis of gas prevention and control. Meanwhile, in the aspect of disaster prediction, a mathematical physical model is established according to ventilation, extraction and fire prevention, and numerical simulation is carried out to predict the spontaneous combustion dangerous area of the coal, so that the lowest propulsion speed for preventing and controlling natural fire is determined, the ventilation and extraction method is optimized, and fire prevention measures are perfected. In addition, in the aspect of disaster forecast, the index gas is determined through experimental means, the spontaneous combustion degree of the coal body is judged by combining a corresponding monitoring system and an analysis technology, and the oxygen concentration distribution monitored by the beam tube can also verify a numerical simulation result, so that the model parameters are corrected.
Description
Technical Field
The invention relates to the technical field of mine disaster prevention and control, in particular to a cooperative prevention and control method for disasters of adjacent goafs of a high-gas coal seam with a large inclination angle.
Background
The most prominent disaster in coal mine production is natural ignition of gas and coal, and when the gas and the coal coexist spontaneously on a working face, the safety production of a mine is greatly threatened. The number of mines in which gas and fire coexist in China is quite large, more than 48% of the national key coal mines belong to high-gas mines, and more than 56% of the national key coal mines have natural ignition tendencies of coal beds.
In the prior art, in order to reduce natural ignition of goafs influenced by air leakage on adjacent working faces, relatively thick coal pillars are reserved, wide coal pillars of about 20-40 m are reserved between the adjacent working faces of some coal mines to prevent natural ignition of the goafs caused by through air leakage of the production (or preparation) working faces and the adjacent goafs, meanwhile, the influence of mine pressure of the working faces is also considered, a supporting effect is also played on supporting arrangement of gob-side roadway driving, and the reserved coal pillars cause great waste of coal resource quantity. In addition, if the coal pillars narrow and are pressed to be crisp at the side of the goaf, even crushed, the coal pillars in the goaf are easy to be naturally ignited, thus threatening the safety production, and meanwhile, if the coal pillars are unreasonably arranged, stress concentration is easy to form, thus causing difficulty in maintaining the underlying roadway. In addition, the problem that the spontaneous combustion and the gas of the coal on the large-inclination-angle high-gas fully-mechanized caving face are difficult to effectively solve due to the fact that the concurrency of disasters is not considered is difficult to consider due to the fact that the problem that the spontaneous combustion and the gas of the coal on the large-inclination-angle high-gas fully-mechanized caving face are difficult to simultaneously take into consideration the concurrency of the fire and the gas in a high-gas mine is solved separately in the prior art.
Therefore, how to provide a cooperative prevention and control method for disasters of adjacent goafs of a large-inclination-angle high-gas coal seam to effectively solve the problems of spontaneous combustion and gas of coal on a large-inclination-angle high-gas fully mechanized caving face becomes a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method, which aims to solve the problems in the prior art, realize roadway protection tunneling and stoping of a narrow coal pillar of a large inclination angle coal seam, facilitate improvement of coal resource recovery rate, and reduce natural ignition and gas overrun accidents of the coal seam caused by the coal pillar.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a large dip angle high gas coal seam adjacent goaf disaster cooperative prevention and control method, which comprises the following steps:
step one, measuring basic parameters of coal sample
Carrying out basic work of coal rock mechanical basic parameter testing, coal bed gas basic parameter testing, gas emission quantity prediction and coal bed natural ignition rule research on a working face so as to obtain the mechanical parameters of the coal rock, the content of the gas on the working face, the gas emission quantity and the spontaneous combustion tendency of the coal bed;
step two, determining the width of the narrow coal pillar of the working face
Calculating the height of the overlying strata three zones by testing various basic parameters of the working face; performing a two-dimensional physical simulation experiment, combining theoretical calculation, comprehensively obtaining the heights of three zones of the overburden stratum, and determining the width of the narrow coal pillar by utilizing numerical simulation;
step three, determining a supporting scheme
Excavating a roadway, namely firstly drilling a roof anchor rod, secondly drilling a side anchor rod, and later supporting and lagging a head-on by an anchor rope; when the section ultra-width of the roadway is larger than 300mm, reinforcement is needed;
step four, determining extraction parameters
Firstly, determining the advancing speed of a working face, carrying out numerical simulation, and determining the air distribution quantity, the extraction negative pressure, the air leakage intensity, the oxygen concentration distribution and the high-position drilling layer position by simulating the field working condition;
step five, arrangement of high-position drilling field
Selecting a high-position drilling field to treat gas on a working surface and a goaf;
step six, fire prevention measures in normal extraction process
During the recovery period, relevant fire prevention measures are made according to the concentration ratio of the spontaneous combustion index gas;
seventhly, carrying out field observation, and recording the microseismic event, gas extraction data and the gas concentration of the coal spontaneous combustion index;
step eight, adjusting and optimizing drilling parameters according to the data in the step seven;
and repeating the steps from one step to eight along with the continuous propulsion of the working surface.
Preferably, in the second step, the narrow coal pillar along the gob-side entry driving is 4m in width, 20-55m inside the lower end head and 8-38m inside the upper end head are in the pressure relief area, the pressure relief area cracks develop, and after coal seam mining, numerical simulation results show that the height of the caving zone is 22m and the height of the crack zone is 106 m.
Preferably, in the third step, the anchor cable support lags and heads for 3-5m, the anchoring force of the top plate anchor rod is larger than 160kN, the anchoring force of the two side anchor rods is larger than 130kN, the designed anchoring force of the anchor cable is not smaller than 200kN, the pre-tightening force of the anchor rod is not smaller than 40kN, the installation torque is not smaller than 400N · m, and the pre-tightening force of the anchor cable is not smaller than 150 kN.
Preferably, in the third step, the lapping length of the lapping is not less than 100mm, the lapping position is twisted and connected with the net by two rows of binding wires, and the lapping is tightened and tightly attached to the rock surface.
Preferably, in the third step, when the ultra-wide section of the roadway is greater than 300mm, additional anchor rods, anchor cables or supporting type supports are adopted for reinforcement.
Preferably, in the third step, the diameter of the anchor rod is 20mm, the length of the anchor rod is 2200mm, the row spacing between the anchor rods is 800mm × 800mm, the diameter of the anchor cable is 22mm, the length of the anchor cable is 7300mm, and the row spacing between the anchor cables is 1600mm × 1600 mm.
Preferably, in the fourth step, the propelling speed of the working face is 4m per day, and the air distribution quantity of the working face is 1100-1400m3And/min, wherein the reasonable extraction negative pressure is 30-40 kPa.
Preferably, in the fifth step, the diameter of the drill hole is 133mm or 120mm, two rows of holes are formed, the upper row of holes is 2m away from the drill site bottom plate, the lower row of holes is 1.5m away from the drill site bottom plate, the upper row of holes is 0.4m away from the edge of the drill site, the distance between adjacent holes is 0.8m, the number of holes drilled in the drill site is 10, and the number of the lower row of holes drilled is 5.
Preferably, in the sixth step, the roof bolt head withdrawing method is adopted to promote the roof fall of the crossheading, so that the air leakage of the goaf is reduced; a curtain is hung at the air inlet corner of the working face, so that the leakage of the goaf is reduced; the recovery rate is improved, so that the coal left in the goaf is reduced; meanwhile, the outlet of the nitrogen injection pipeline is arranged in a goaf 50m away from the air inlet side of the working surface in combination with nitrogen injection measures, and an intermittent nitrogen injection mode is adopted.
Compared with the prior art, the invention has the following technical effects: the large dip angle high gas coal seam adjacent goaf disaster cooperative prevention and control method provided by the invention is mainly based on prediction, in the aspect of gas, according to mining conditions and gas emission quantity prediction, the air quantity, ventilation form and propulsion speed are reasonably determined, an extraction method is preferably selected, and gas is efficiently treated; in the aspect of coal spontaneous combustion, the spontaneous combustion characteristic of coal is determined through experiments, and a fire prevention method is formulated from two aspects of oxygen control and time control on the basis of gas prevention and control. Meanwhile, in the aspect of disaster prediction, a mathematical physical model is established according to ventilation, extraction and fire prevention, and numerical simulation is carried out to predict the spontaneous combustion dangerous area of the coal, so that the lowest propulsion speed for preventing and controlling natural fire is determined, the ventilation and extraction method is optimized, and fire prevention measures are perfected. In addition, in the aspect of disaster forecast, the index gas is determined by experimental means, and the judgment on the spontaneous combustion degree of the coal body is quite effective by combining a corresponding monitoring system and an analysis technology. The oxygen concentration distribution monitored by the beam tube can also verify the numerical simulation result, thereby correcting the model parameters. The invention discloses a large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method, which is a comprehensive gob-side entry driving asymmetric surrounding rock control support technology, a reasonable horizon extracted by a high-position drill site, an effective extraction section, a fire prevention and extinguishing technology and a gas and fire cooperative prevention and control technology system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a cooperative disaster prevention and control method for an adjacent goaf of a high-inclination-angle high-gas coal seam according to the present invention;
FIG. 2 is a schematic diagram of calculation of height of a caving zone in a second step of the cooperative prevention and control method for disasters of adjacent goafs of a high-inclination-angle and high-gas coal seam according to the present invention;
FIG. 3 is a schematic diagram of calculation of the heights of overlying strata zones and three zones in the second step of the cooperative prevention and control method for disasters of adjacent goafs of the high-inclination-angle and high-gas coal seam;
FIG. 4 is a cross-sectional view of roadway support in the fourth step of the cooperative prevention and control method for disaster in the goaf adjacent to the high-gas coal seam with a large inclination angle;
FIG. 5 is a schematic diagram of a reasonable propulsion speed interval of a coal mining working face of the large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method of the invention;
FIG. 6 is a schematic diagram of the microseismic arrangement position of the cooperative prevention and control method for disaster in the goaf adjacent to the high-gas coal seam with a large dip angle;
FIG. 7 is a schematic cross-sectional view of a high-level drill site of the cooperative disaster prevention and control method for the goaf adjacent to the high-gas coal seam with the large dip angle;
wherein, 1 is the stock, 2 is the anchor rope, 3 is the collection appearance, 4 is the sensor, 5 is the track.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method, which aims to solve the problems in the prior art, realize roadway protection tunneling and stoping of a narrow coal pillar of a large inclination angle coal seam, facilitate improvement of coal resource recovery rate, and reduce natural ignition and gas overrun accidents of the coal seam caused by the coal pillar.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-7, wherein fig. 1 is a schematic diagram of a disaster cooperative prevention and control method for an adjacent goaf of a high dip angle high gas coal seam, fig. 2 is a schematic diagram of calculating heights of caving zones in step two of the disaster cooperative prevention and control method for an adjacent goaf of a high dip angle high gas coal seam, fig. 3 is a schematic diagram of calculating heights of overlying strata and three zones in step two of the disaster cooperative prevention and control method for an adjacent goaf of a high dip angle high gas coal seam, fig. 4 is a sectional diagram of roadway supports in step four of the disaster cooperative prevention and control method for an adjacent goaf of a high dip angle high gas coal seam, fig. 5 is a schematic diagram of reasonable advancing speed interval of a coal mining working face of the disaster cooperative prevention and control method for an adjacent goaf of a high dip angle high gas coal seam, fig. 6 is a schematic diagram of microseismic arrangement position of the disaster cooperative prevention and control method for an adjacent goaf of a high dip angle high gas coal seam, fig. 7 is a schematic cross-sectional view of a high-level drill site of the cooperative disaster prevention and control method for the goaf adjacent to the high-gas coal seam with the large dip angle.
The invention provides a large dip angle high gas coal seam adjacent goaf disaster cooperative prevention and control method, which comprises the following steps:
step one, measuring basic parameters of coal sample
And carrying out basic work of testing basic parameters of coal rock mechanics, testing basic parameters of coal bed gas, predicting gas emission quantity and researching natural ignition law of the coal bed on the working face so as to obtain the mechanical parameters of the coal rock, the content of the gas on the working face, the gas emission quantity and the spontaneous combustion tendency of the coal bed.
Step two, determining the width of the narrow coal pillar of the working face
Calculating the height of the overlying strata three zones by testing various basic parameters of the working face; performing a two-dimensional physical simulation experiment, combining theoretical calculation, comprehensively obtaining the heights of three zones of an overlying strata, as shown in fig. 2, and determining the width of a narrow coal pillar by using 3DEC numerical simulation, wherein the width of the narrow coal pillar along a gob-side entry driving is 4m, the inner side of a lower end head is 20-55m, the inner side of an upper end head is 8-38m and is located in a pressure relief area, cracks of the pressure relief area develop, and after a coal seam is mined, the numerical simulation result shows that the height of a collapse zone is 22m, and the height of a fracture zone is 106m, as shown in fig. 3.
Step three, determining a supporting scheme
Excavating a roadway, namely firstly drilling a top plate anchor rod 1, secondly drilling side anchor rods 1, supporting and lagging a head-on of an anchor rope 2 by 3-5m, wherein the anchoring force of the top plate anchor rod 1 is more than 160kN, the anchoring force of the two side anchor rods 1 is more than 130kN, the designed anchoring force of the anchor rope 2 is not less than 200kN, the pretightening force of the anchor rod 1 is not less than 40kN, the installation torque is not less than 400 N.m, and the pretightening force of the anchor rope 2 is not less than 150 kN; when the section of the roadway is ultra-wide and larger than 300mm, reinforcement is needed, and additional anchor rods 1, anchor cables 2 or supporting type supports can be adopted for reinforcement, as shown in fig. 4, in the specific embodiment, the anchor cables 2 and part of the anchor rods 1 are arranged in a radial mode, and the minimum included angles between the anchor rods 1 and the anchor cables 2 and a horizontal plane or a vertical plane are respectively 15 degrees and 24 degrees.
Step four, determining extraction parameters
Firstly, determining the propelling speed of a working face, wherein the propelling speed is 4m every day, the gas emission speed is too high due to too high propelling speed, the coal bed is easy to generate spontaneous combustion due to too low propelling speed, carrying out FLUENT numerical simulation at reasonable propelling speed, and determining reasonable air distribution quantity, extraction negative pressure, air leakage strength, oxygen concentration distribution and a high-position drilling layer position through simulating field working conditions, wherein the air distribution quantity of the working face is 1400 m-3The reasonable extraction negative pressure is 30-40kPa when the extraction pressure is changed within the range of/min.
Step five, arrangement of high-position drilling field
Selecting a high-position drill site to treat gas on a working face and a goaf, wherein the diameter of each drill hole is 133mm or 120mm, two rows of holes are arranged, the distance between the upper row of holes and the drill site bottom plate is 2m, the distance between the lower row of holes and the drill site bottom plate is 1.5m, the distance between the upper row of holes and the drill site edge is 0.4m, the distance between adjacent holes is 0.8m, the number of holes in the drill site is 10, and the number of the lower row of holes is 5.
Step six, fire prevention measures in normal extraction process
During the recovery period, relevant fire prevention measures are made according to the concentration ratio of the spontaneous combustion index gas; the roof caving of the crossheading is promoted by adopting methods of withdrawing the 1 head of the anchor rod and the like, and the air leakage of the goaf is reduced; a curtain is hung at the air inlet corner of the working face, so that the leakage of the goaf is reduced; the recovery rate is improved, so that the coal left in the goaf is reduced; meanwhile, the outlet of the nitrogen injection pipeline is arranged in a goaf 50m away from the air inlet side of the working surface in combination with nitrogen injection measures, and an intermittent nitrogen injection mode is adopted.
And seventhly, carrying out field observation, and recording the microseismic event (shown in figure 6), the gas extraction data and the coal spontaneous combustion index gas concentration. The microseism test piece utilizes sensor 4 and the 3 records of collection appearance, and sensor 4 can slide along track 5, is convenient for adjust the interval between adjacent sensor 4 and the adjacent collection appearance 3, improves the simple operation nature.
Step eight, adjusting and optimizing drilling parameters according to the data in the step seven;
and repeating the steps from one step to eight along with the continuous propulsion of the working surface.
Along with the increase of the mining depth and the output, two problems of gas and spontaneous combustion in the goaf tend to be prominent. The mining intensity is increased, on one hand, the residual coal quantity of the coal bed is increased, the degree of breakage of the close-distance adjacent coal bed is increased, and the spontaneous combustion condition is more favorable; meanwhile, gas gushing out of the coal seam and the adjacent coal seam is increased, absolute gas gushing amount of the working face is increased greatly, ventilation of the working face is increased objectively, and natural ignition of the goaf is caused to be more frequent. At present, the common consensus on gas and coal spontaneous combustion disasters is that the gas and coal spontaneous combustion disasters are mutually influenced and restricted, and a method for preventing and controlling the gas disasters in a coal mine mainly adopts various measures to control gas accumulation, so that the gas accumulation does not reach the explosion concentration, but the inside of an excavated area cannot be controlled, and only an ignition source can be controlled by means of coal spontaneous combustion prevention and control. The spontaneous combustion of coal must simultaneously have four conditions, namely, the accumulated crushed coal has spontaneous combustion tendency, oxygen supply environment, heat storage condition and oxidation time. The accumulated crushed coal and spontaneous combustion tendency are determined by objective conditions of coal mining, so that the coal spontaneous combustion prevention and control mainly starts from three aspects of oxygen control, temperature control and time control. Wherein, the air leakage reduction, inerting and time control of oxygen control are mutually influenced with the gas disaster prevention and control.
The large-dip-angle high-gas coal seam adjacent goaf disaster cooperative prevention and control method comprehensively realizes the functions of accumulated days for tunneling, daily footage, accumulated footage, air distribution quantity,Factors such as lithology, folds and faults of surrounding rocks are developed based on an MATLAB platform, a dynamic prediction system for analyzing key factors of gas emission quantity is developed, a grey correlation degree analysis method is utilized, main control influence factors of the gas emission quantity under the condition are determined, and the blank of prediction of the gas emission quantity of a narrow coal pillar working face of a large-dip-angle high-gas spontaneous combustion coal bed is filled. On the other hand, the invention forms the asymmetric surrounding rock control technology of the gob-side entry driving of the large-dip-angle coal seam, realizes the change from the traditional wide coal pillar entry driving to the narrow coal pillar entry protection, reduces the width of the coal pillar by more than 90 percent, realizes the maximum recovery of coal resources, reduces the deformation of the surrounding rock of the roadway by 50 to 80 percent, and ensures the safe and efficient production of the gob-side entry driving working face of the large-dip-angle coal seam. In addition, a large-dip-angle high-gas easily-self-flammable coal seam narrow coal pillar fully mechanized caving face goaf gas and coal fire coupling disaster-causing mechanism is disclosed, a disaster control idea is formed, corresponding process parameters are obtained, reasonable air distribution, reasonable extraction negative pressure and reasonable propelling speed are established, spontaneous combustion prevention and control of coal in a goaf with nitrogen injection in an open area, sealing grouting after mining, CO (carbon monoxide) and the like are formed2An emergency fire extinguishing technology provides a goaf disaster treatment technology for a narrow coal pillar fully mechanized caving face of a large-dip-angle high-gas easily self-combustible coal seam.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A large dip angle high gas coal seam adjacent goaf disaster cooperative prevention and control method is characterized by comprising the following steps:
step one, measuring basic parameters of coal sample
Carrying out basic work of coal rock mechanical basic parameter testing, coal bed gas basic parameter testing, gas emission quantity prediction and coal bed natural ignition rule research on a working face so as to obtain the mechanical parameters of the coal rock, the content of the gas on the working face, the gas emission quantity and the spontaneous combustion tendency of the coal bed;
step two, determining the width of the narrow coal pillar of the working face
Calculating the height of the overlying strata three zones by testing various basic parameters of the working face; performing a two-dimensional physical simulation experiment, combining theoretical calculation, comprehensively obtaining the heights of three zones of overlying strata, and determining the width of the narrow coal pillar by utilizing numerical simulation;
step three, determining a supporting scheme
Excavating a roadway, namely firstly drilling a roof anchor rod, secondly drilling a side anchor rod, and later supporting and lagging a head-on by an anchor rope; when the section ultra-width of the roadway is larger than 300mm, reinforcement is needed;
step four, determining extraction parameters
Firstly, determining the advancing speed of a working face, carrying out numerical simulation, and determining the air distribution quantity, the extraction negative pressure, the air leakage intensity, the oxygen concentration distribution and the high-position drilling layer position by simulating the field working condition;
step five, arrangement of high-position drilling field
Selecting a high-position drilling field to treat gas on a working surface and a goaf;
step six, fire prevention measures in normal extraction process
During the recovery period, relevant fire prevention measures are made according to the concentration ratio of the spontaneous combustion index gas of the coal;
seventhly, carrying out field observation, and recording the microseismic event, gas extraction data and the gas concentration of the coal spontaneous combustion index;
step eight, adjusting and optimizing drilling parameters according to the data in the step seven;
and repeating the steps from one step to eight along with the continuous propulsion of the working surface.
2. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 1, characterized in that: in the second step, the width of the narrow coal pillar along the gob-side entry driving is 4m, the inner side of the lower end head is 20-55m, the inner side of the upper end head is within the range of 8-38m and is positioned in a pressure relief area, cracks in the pressure relief area develop, and after the coal seam is mined, the numerical simulation result shows that the height of a caving zone is 22m and the height of the crack zone is 106 m.
3. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 1, characterized in that: in the third step, the anchor cable support lags to the head by 3-5m, the anchoring force of the top plate anchor rod is larger than 160kN, the anchoring force of the two side anchor rods is larger than 130kN, the designed anchoring force of the anchor cable is not smaller than 200kN, the pre-tightening force of the anchor rod is not smaller than 40kN, the installation torque is not smaller than 400 N.m, and the pre-tightening force of the anchor cable is not smaller than 150 kN.
4. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 3, characterized in that: and in the third step, the lapping length of the lapping is not less than 100mm, two rows of binding wires are used for twisting the lapping position to form a net, and the lapping is tensioned and tightly attached to the rock surface.
5. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 4, characterized in that: and in the third step, when the section of the roadway is over wide and is larger than 300mm, reinforcing by using a supplementary anchor rod, an anchor cable or a support type bracket.
6. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 5, characterized in that: in the third step, the diameter of the anchor rod is 20mm, the length of the anchor rod is 2200mm, the row spacing between the anchor rods is 800mm multiplied by 800mm, the diameter of the anchor cable is 22mm, the length of the anchor cable is 7300mm, and the row spacing between the anchor cables is 1600mm multiplied by 1600 mm.
7. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 1, characterized in that: in the fourth step, the propelling speed of the working face is 4m per day, and the air distribution quantity of the working face is 1100-1400m3And/min, wherein the reasonable extraction negative pressure is 30-40 kPa.
8. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 1, characterized in that: and fifthly, drilling holes with the diameter of 133mm or 120mm, forming an upper row of holes and a lower row of holes, wherein the upper row of holes is 2m away from the drilling site bottom plate, the lower row of holes is 1.5m away from the drilling site bottom plate, the upper row of holes is 0.4m away from the edge of the drilling site, the distance between adjacent holes is 0.8m, the number of holes drilled in the drilling site is 10, and the number of the lower row of holes drilled is 5.
9. The large inclination angle high gas coal seam adjacent goaf disaster cooperative prevention and control method according to claim 1, characterized in that: in the sixth step, the roof bolt head withdrawing method is adopted to promote the roof of the crossheading to fall off, and the air leakage of the goaf is reduced; a curtain is hung at the air inlet corner of the working face, so that air leakage of the goaf is reduced; the recovery rate is improved, so that the coal left in the goaf is reduced; meanwhile, the nitrogen injection measures are combined, the outlet of the nitrogen injection pipeline is arranged in a goaf 50m away from the air inlet side of the working face, and an intermittent nitrogen injection mode is adopted.
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| CN112685926B (en) * | 2020-12-02 | 2023-12-26 | 西安科技大学 | Construction period discrimination method for shallow coal seam air leakage prevention and control engineering |
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