CN112832849A - Method for removing outburst by combined pumping and drainage of main tunnel and flat guide gas of outburst coal seam with complex structure - Google Patents
Method for removing outburst by combined pumping and drainage of main tunnel and flat guide gas of outburst coal seam with complex structure Download PDFInfo
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- CN112832849A CN112832849A CN202110314222.0A CN202110314222A CN112832849A CN 112832849 A CN112832849 A CN 112832849A CN 202110314222 A CN202110314222 A CN 202110314222A CN 112832849 A CN112832849 A CN 112832849A
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- 238000005086 pumping Methods 0.000 title claims abstract description 186
- 239000003245 coal Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 83
- 238000010276 construction Methods 0.000 claims abstract description 37
- 230000008030 elimination Effects 0.000 claims abstract description 23
- 238000003379 elimination reaction Methods 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 238000012795 verification Methods 0.000 claims abstract description 4
- 239000004047 hole gas Substances 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 14
- 230000002265 prevention Effects 0.000 claims description 13
- 239000011435 rock Substances 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 241001670157 Gymnura Species 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 241000287127 Passeridae Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a method for removing outburst by pumping and draining in a combined manner of a main hole and flat guide gas of a outburst coal seam with a complex structure, which comprises the following steps: s1, drilling holes in advance to penetrate all coal seams, finding out the positions and distribution characteristics of the coal seams, and taking the coal seams in the range of the main tunnel and the horizontal guide structure as a whole into the range of combined pumping and drainage; s2, arranging a main hole pumping and discharging working hole and a horizontal guide pumping and discharging working hole, and additionally arranging branch holes on the horizontal guide side to serve as transverse channels; s3, performing combined pumping drainage on the main tunnel and the horizontal guide, and respectively performing pumping drainage holes on the coal seams in the main tunnel and the horizontal guide anticline range; s4, arranging a set of pumping system, wherein gas in the coal seam range enters the pumping system through a pumping hole, and is discharged after harmless treatment; s5, testing the combined pumping and draining effect; and S6, plugging the transverse channel, the main hole and the flat guide to respectively carry out region verification and subsequent processes. The invention improves the gas pumping and drainage outburst elimination effect, reduces the construction difficulty of the traditional pumping and drainage drilling, and has convenient construction, safety, reliability, economy and better pumping and drainage effect.
Description
Technical Field
The invention relates to the technical field of tunnel coal uncovering outburst prevention, in particular to a method for removing outburst by combined pumping of a front hole and flat guide gas of a complex-structure outburst coal seam.
Background
Coal and gas outburst is a serious natural disaster in the tunneling process of coal mines, tunnel engineering and the like, and can destroy roadway facilities and mine ventilation systems when the outburst occurs, so that coal rocks and gas are gushed out in a large quantity, people are injured by impact, people are buried by coal flows, the gas causes people suffocation, even serious gas and coal dust explosion is caused, and huge losses such as production interruption, casualties and the like are caused.
Newly-built eastern ring line engineering sparrow rock tunnel of Chongqing railway junction is the high risk tunnel of I level risk management. The tunnel passes through the middle beam mountain range, is positioned in a karst horizontal runoff zone, the tunnel body develops two underground rivers, meanwhile, the tunnel continuously passes through a gas outburst coal seam of a two-cascade system quan group for six times near a fault of a kwan-yin gorge anticline core part, the risk is extremely high, the civil construction period of the tunnel is designed by a construction drawing, and the tunnel is the tunnel which is the most controlled by the whole project. In order to meet the requirements of construction period, drainage and construction ventilation, a horizontal guide with the total length of 3154m is arranged at the right side 35m of the central line of the tunnel outlet section line, a front hole and the horizontal guide both continuously penetrate through a gas outburst coal bed of a pool group on K9, K9 and K8 at a back inclined core part, the coal quality is coking coal, and the space between the coal beds is smaller than 9 m; the coal seam thickness of K8 is 3m, the initial gas diffusion speed delta P is 8, the gas content per ton coal is 12.21m3/t, the coal seam gas pressure P is 0.97MPa, the coal seam firmness coefficient f is 0.35, the damage type of the coal is III-IV, and the tunnel is determined to be a gas outburst tunnel by geology. According to the arrangement of construction groups, a main tunnel and a horizontal gas outburst coal seam respectively adopt a systematic safety control measure comprising long-distance advanced geological forecast + region + local comprehensive outburst prevention, when tunnel type ventilation, horizontal guidance or main tunnel is adopted to implement coal uncovering outburst prevention operation, the other working face stops construction, and the construction period of the main tunnel and the horizontal guidance coal uncovering is about 8 months. In the implementation process, the coal bed gas outburst risk is higher than that of the original design through the parallel-guiding long-distance advanced geological prediction and the regional outburst risk prediction. The thickness of a K8 coal bed is 4.05m, the initial gas diffusion speed delta P is 18, the gas content per ton coal is 16.32m3/t, the gas pressure P of the coal bed is 1.5-1.6 MPa, the firmness coefficient f of the coal bed is 0.16, the damage type of the coal is IV, the outburst risk of coal and gas in coal layers above K9 and below K8 is higher than that of a construction drawing, and the outburst risk of main holes, flat guide coal and gas is extremely high. Meanwhile, the tunnel karst underground river treatment results in more delay of the construction period compared with the design construction period and extremely short construction period.
For main tunnel and horizontal gas drainage, there are cases of simultaneously constructing main tunnel and horizontal gas drainage hole through horizontal guiding, gas drainage from horizontal guiding drainage hole and main tunnel drainage hole, and discharging gas through horizontal guiding, such as patent numbers CN201810068642.3, CN 201610073190.9. However, in the two patents, the gas pumping holes are uniformly distributed in the flat guide, and the main hole and the flat guide pumping holes are difficult to be constructed in parallel, so that the gas pumping holes are long in construction time and low in efficiency; meanwhile, due to the influence of the length and the angle of the drilled hole, the construction of the main hole pumping hole in the flat guide is difficult. The above factors cause lower working efficiency of the gas pumping and drainage hole and poorer gas pumping and drainage, especially outburst elimination effect of the main hole; leading to the follow-up coal uncovering outburst prevention process and the tunnel construction to have certain potential safety hazards.
In view of the fact that the stinger rock tunnel positive hole and the horizontal guide part continuously penetrate through a gas outburst coal seam for multiple times, the tunnel construction period is short, and the coal and gas outburst risks are extremely high, the method relies on the combination of the eastern-ring line stinger rock gas outburst tunnel positive hole and the horizontal guide part for pump drainage and outburst elimination, and under the guidance of a comprehensive outburst prevention measure in a four-in-one area, provides 'a method for pump drainage and outburst elimination of the complex structure outburst coal seam positive hole and the horizontal guide part', is directly used for guiding the coal uncovering project outburst elimination operation of the stinger rock tunnel, and can provide guidance for the coal uncovering and outburst elimination.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for removing outburst by pumping and drainage by combining a straight hole and flat guide gas of a outburst coal seam with a complex structure, so as to solve the problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for removing outburst of a complex-structure outburst coal seam by positive hole and flat guided gas combined pumping comprises the following implementation steps:
s1, penetrating all coal seams at a distance of more than 20m from the coal seam at one time to implement ultra-long distance advanced geological forecast and regional risk forecast, drilling ahead holes to penetrate all the coal seams, finding out the positions and distribution characteristics of the coal seams, and bringing the coal seams in the range of the main tunnel and the horizontal guidance structure into a combined pumping and drainage range as a whole;
s2, continuing to construct the tunnel according to the gas outburst to a position where the distance from the normal line of the coal seam is more than 10m, arranging a main tunnel pumping and discharging working hole and a horizontal guiding and pumping and discharging working hole, additionally arranging a branch tunnel at a position where the distance from the horizontal guiding side to the coal seam is more than 50m as a horizontal channel so as to communicate the main tunnel pumping and discharging working hole and the horizontal guiding and pumping and discharging working hole, wherein the sizes of the branch tunnel and the horizontal channel are equal to the horizontal guiding section, the main tunnel pumping and discharging working hole is parallel to the horizontal guiding, and the main tunnel pumping and discharging working hole and the horizontal guiding and pumping and discharging working hole are supported according to the;
s3, performing hydraulic fracturing permeability-increasing treatment on all coal seams penetrated through by the main tunnel and the horizontal guide in the main tunnel pumping and drainage working hole and the horizontal guide pumping and drainage working hole at one time respectively, performing combined pumping and drainage on the main tunnel and the horizontal guide, performing main tunnel pumping and drainage holes on the coal seam in the back-inclined range of the main tunnel, and performing horizontal guide pumping and drainage holes on the coal seam in the back-inclined range of the horizontal guide;
s4, arranging a set of pumping system in the main hole pumping and discharging working hole and the horizontal guide pumping and discharging working hole, wherein gas in the main hole pumping and discharging area enters the pumping and discharging system through the main hole pumping and discharging hole, and gas in the horizontal guide pumping and discharging area enters the pumping and discharging system through the horizontal guide pumping and discharging hole, and is discharged after being subjected to harmless treatment by the pumping and discharging system;
s5, performing combined drainage effect inspection, namely firstly, respectively calculating gas extraction amount of the main hole and the horizontal drainage, and after the gas extraction rate of the main hole and the horizontal drainage meets the design requirements, performing regional outburst prevention effect inspection, wherein the residual gas content of the main hole and the horizontal drainage coal seam is less than 5m3When the flow rate is/t, the joint pump drainage and outburst elimination is judged to be effective;
and S6, in order to ensure the subsequent construction safety, C25 concrete is adopted to plug the transverse passage, and the subsequent regional verification and the subsequent procedures are respectively carried out on the main tunnel and the horizontal guide according to the coal uncovering outburst prevention requirement of the gas outburst tunnel.
Preferably, the combined drainage range in step S1 includes all coal seams in the ranges of the main hole and the horizontal and horizontal anticline K8, K9 and K9.
Preferably, the main hole pumping hole and the pilot pumping hole are drilled with a diameter of phi 89, and the distance between the drilled hole and the rock stratum is at least 0.5 m.
Preferably, the hole bottom spacing of the main hole pumping hole and the hole bottom spacing of the guide pumping hole are both 4 m.
Preferably, in step S2, the tunnel face of the main-tunnel pumping and drainage working tunnel and the tunnel face of the pilot pumping and drainage working tunnel are both closed by using C25 airtight sprayed concrete with a thickness of not less than 15 cm.
Preferably, the drainage system in step S4 includes a main tunnel gas drainage pipe arranged in the main tunnel drainage working tunnel and a main horizontal guide gas drainage pipe arranged in the horizontal guide drainage working tunnel, and the main tunnel gas drainage pipe passes through the horizontal passage and then communicates with the main horizontal guide gas drainage pipe, and the main horizontal guide gas drainage pipe communicates with a gas drainage station located outside the tunnel;
the main tunnel gas drainage hole is communicated with the main tunnel gas drainage branch pipe through a main tunnel gas drainage pipe, the main tunnel gas drainage branch pipe is communicated with the main tunnel gas drainage pipe, the flat guide gas drainage hole is communicated with the flat guide gas drainage branch pipe through a flat guide gas drainage pipe, and the flat guide gas drainage branch pipe is communicated with the flat guide gas drainage main pipe.
Preferably, the main-hole gas drainage branch pipes are two groups and are respectively communicated with the main pipe, one part of the main-hole drainage holes are communicated with one group of main-hole gas drainage branch pipes through the main-hole gas drainage pipe, and the other part of the main-hole drainage holes are communicated with the other group of main-hole gas drainage branch pipes through the main-hole gas drainage pipe.
Preferably, the number of the flat guide gas drainage branch pipes is two, and the two branch pipes are respectively communicated with the main flat guide gas drainage pipe, wherein one part of the flat guide gas drainage holes are communicated with one group of the flat guide gas drainage branch pipes through the flat guide gas drainage pipe, and the other part of the flat guide gas drainage holes are communicated with the other group of the flat guide gas drainage branch pipes through the flat guide gas drainage pipe.
Preferably, the communication position of the main tunnel gas drainage branch pipe and the main tunnel gas drainage pipe, the communication position of the main tunnel gas drainage pipe and the main horizontal guide gas drainage pipe, the communication position of the main horizontal guide gas drainage branch pipe and the main horizontal guide gas drainage pipe, and the communication position of the second main gas drainage pipe and the gas drainage station are all provided with water-gas separation equipment.
Compared with the prior art, the invention has the beneficial effects that: (1) the main hole and the horizontal guide are respectively provided with independent pumping and drainage working holes, so that the construction efficiency of the gas pumping and drainage hole and the gas pumping and drainage outburst elimination effect are improved, and the construction difficulty of a pumping and drainage drilling hole is reduced; (2) through the arrangement of the main tunnel pumping and drainage branch tunnel (transverse channel), advanced combined pumping and drainage of gas in the main tunnel and in the horizontal guide coal seam crossing section is realized, independent pumping and drainage outburst elimination of the main tunnel and the horizontal guide is avoided, the gas pumping and drainage construction period of the tunnel is greatly saved, the working procedure connection is compact, the operability is strong, the pumping and drainage effect is reliable, and the requirements of energy conservation and environmental protection are met; (3) the main hole and the horizontal guide share a set of gas pumping and discharging system, so that the investment cost is effectively reduced; (4) all coal seams are penetrated in one step and combined drainage is implemented, so that compared with one-by-one coal seam drainage, the construction period is shortened, the construction efficiency is greatly improved, and the engineering investment is saved; (5) by taking the extraction amount and the gas content of each ton of coal as the double-control outburst elimination technical indexes, firstly, after the extraction rate of the main hole and the horizontal guide gas simultaneously meet the design requirements, the method can enter the regional outburst prevention effect test, and after the residual gas content of the main hole and the horizontal guide coal layer simultaneously reach the outburst elimination effect, the method can enter the subsequent links. The positive hole and flat lead combined pumping and protrusion eliminating technology is safe and reliable. The construction method has the characteristics of convenience in construction, safety, reliability, rapidness, economy and the like, and meets the requirements of energy conservation and environmental protection.
Description of the drawings:
fig. 1 is a schematic view of the construction of an evacuation work hole and an evacuation system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The complex structure outburst coal seam main tunnel and flat guide gas combined pumping drainage outburst elimination structure shown in the attached figure 1 comprises a main tunnel pumping drainage working tunnel 1 and a flat guide pumping drainage working tunnel 2, the main tunnel pumping drainage working tunnel 1 and the flat guide pumping drainage working tunnel 2 are communicated through a transverse passage 8, the transverse passage 8 is realized by additionally arranging branch tunnels at the positions, away from a coal seam, of more than 50m in the flat guide side direction, the sizes of the branch tunnels are flat guide sections, and in order to improve the sealing performance of surrounding rocks and reduce gas permeation, the tunnel faces of the main tunnel pumping drainage working tunnel 1 and the tunnel faces of the flat guide pumping drainage working tunnel 2 are both sealed by C25 airtight jet concrete with the thickness of not less than 15 cm.
The main gas pumping and discharging pipe 61 of the main tunnel is arranged in the main tunnel pumping and discharging working tunnel 1, the main gas pumping and discharging pipe 62 of the flat guide is arranged in the working tunnel 2, the main gas pumping and discharging pipe 61 of the main tunnel penetrates through the transverse channel 8 and then is communicated with the main gas pumping and discharging pipe 62 of the flat guide, the main gas pumping and discharging pipe 62 of the flat guide is communicated with a gas pumping and discharging station 9 positioned outside the tunnel, and lightning protection is arranged at the gas pumping and discharging station 9.
The positive hole pumping and discharging holes 31 are distributed on the coal seam located in the positive hole gas pumping and discharging area, the horizontal guide pumping and discharging holes 32 are distributed on the coal seam located in the horizontal guide gas pumping and discharging area, the positive hole pumping and discharging holes 31 and the horizontal guide pumping and discharging holes 32 are drilled with phi 89, the pumping and discharging range comprises all coal seams in the anticline ranges of K8, K9 and K9, the distance between the drilled holes entering the rock stratum is not less than 0.5m, and the distance between the bottoms of the pumping and discharging holes is 4 m. Each main hole drainage hole 31 is communicated with a main hole gas drainage branch pipe 51 through a corresponding main hole gas drainage pipe 41, namely the number of the main hole drainage holes 31 is the same as that of the main hole gas drainage pipes 41, the main hole gas drainage pipes 41 and the main hole gas drainage branch pipes 51 are positioned in the main hole drainage working hole 1, the main hole gas drainage branch pipes 51 are communicated with the main hole gas drainage pipe 61, each flat guide drainage hole 32 is communicated with a flat guide gas drainage branch pipe 52 through a corresponding flat guide gas drainage pipe 42, namely the number of the flat guide drainage holes 32 is the same as that of the flat guide gas drainage pipes 42, the flat guide gas drainage pipes 42 and the flat guide gas drainage branch pipes 52 are positioned in the flat guide drainage working hole 2, and the flat guide gas drainage branch pipes 52 are communicated with a flat guide gas drainage main pipe 62.
As can be seen from the figure, there are two sets of main hole gas drainage branch pipes 51, which are respectively communicated with the main hole gas drainage pipe 61, wherein one part of the main hole drainage holes 31 is communicated with one set of main hole gas drainage branch pipes 51 through the main hole gas drainage pipe 41, and the other part of the main hole drainage holes 31 is communicated with the other set of main hole gas drainage branch pipes 51 through the main hole gas drainage pipe 41; the flat gas drainage branch pipes 52 are in two groups, and are respectively communicated with the flat gas drainage main pipe 62, wherein one part of the flat gas drainage holes 32 is communicated with one group of the flat gas drainage branch pipes 52 through the flat gas drainage pipe 42, and the other part of the flat gas drainage holes 32 is communicated with the other group of the flat gas drainage branch pipes 52 through the flat gas drainage pipe 42. By the arrangement, the pumping efficiency is better, and the pumping effect is better.
And water and gas separation equipment 7 is arranged at the communication position of the main tunnel gas drainage branch pipe 51 and the main tunnel gas drainage pipe 61, the communication position of the main tunnel gas drainage pipe 61 and the main horizontal guide gas drainage pipe 62, the communication position of the main horizontal guide gas drainage branch pipe 52 and the main horizontal guide gas drainage pipe 62 and the communication position of the main horizontal guide gas drainage pipe 62 and the gas drainage station 9.
A method for removing outburst of a complex-structure outburst coal seam by positive hole and flat guided gas combined pumping comprises the following implementation steps:
s1, penetrating all coal seams at a distance of more than 20m from the coal seams at one time to implement ultra-long distance advanced geological forecast and regional risk prediction, drilling ahead holes to penetrate all the coal seams, finding out the positions and distribution characteristics of the coal seams, taking the coal seams in the range of the main cave and the horizontal guidance structure as a whole into the range of combined pump drainage and outburst elimination control, wherein the range of combined pump drainage comprises all the coal seams in the ranges of the main cave and the horizontal guidance anticline K8, K9 and K9;
s2, in order to improve the gas pumping and outburst elimination effect and reduce the construction difficulty of pumping and drainage drilling holes, independent pumping and drainage working holes are respectively arranged in a front hole and a horizontal guide, considering that the coal seam structure is complex and the gas outburst risk is high, in order to ensure the construction safety, the pumping and drainage working holes are arranged at the position which is not less than 10m away from the coal seam vertical distance, namely, the position which is more than 10m away from the coal seam normal line is constructed according to the gas outburst tunnel, a front hole pumping and drainage working hole 1 and a horizontal guide pumping and drainage working hole 2 are respectively arranged, the front hole pumping and drainage working hole 1 and the horizontal guide pumping and drainage working hole 2 are communicated through a horizontal channel 8, the horizontal channel 8 is realized by additionally arranging branch holes at the position which is more than 50m away from the coal seam in the horizontal guide side, the branch holes are that the size of the horizontal channel 8 is equal to the horizontal guide section, the horizontal guide pumping and drainage working hole 2 is arranged by an auxiliary gallery, the front hole pumping and drainage working hole 1 is parallel to, in order to improve the sealing performance of surrounding rocks and reduce gas permeation, C25 airtight jet concrete with the thickness not less than 15cm is adopted on the face of the main tunnel pumping and drainage working hole 1 and the face of the guide pumping and drainage working hole 2 for sealing;
s3, performing hydraulic fracturing permeability-increasing treatment on all coal seams penetrated through by the main tunnel and the horizontal guide in the main tunnel pumping and drainage working hole and the horizontal guide pumping and drainage working hole at one time respectively, performing combined pumping and drainage on the main tunnel and the horizontal guide, constructing a main tunnel pumping and drainage hole 31 in the coal seam in the back-inclined range of the main tunnel, constructing a horizontal guide pumping and drainage hole 32 in the coal seam in the horizontal guide back-inclined range, drilling holes with the diameter of phi 89 in the main tunnel pumping and drainage hole 31 and the horizontal guide pumping and drainage hole 32, wherein the distance from the drilling holes to the rock stratum is at least 0.5m, and the hole bottom spacing of the main tunnel pumping and drainage hole 31 and the horizontal guide pumping and drainage hole 32 is 4 m;
s4, for saving cost and improving gas pumping and discharging effect, the main tunnel and the horizontal guide share a set of gas pumping and discharging system for performing gas pumping and discharging in a combined pumping and discharging range, the pumping and discharging system is shown in figure 1, the main tunnel pumping and discharging hole 31 is respectively communicated with the main tunnel gas pumping and discharging branch pipe 51 through the corresponding main tunnel gas pumping and discharging pipe 41, the main tunnel gas pumping and discharging branch pipe 51 and the main tunnel gas pumping and discharging pipe 61 are all positioned in the main tunnel pumping and discharging working tunnel 1, the horizontal guiding and discharging hole 32 is respectively communicated with the horizontal guiding gas pumping and discharging branch pipe 52 through the corresponding horizontal guiding gas pumping and discharging pipe 42, the horizontal guiding gas pumping and discharging branch pipe 52 and the horizontal guiding gas pumping and discharging main pipe 62 are all positioned in the horizontal guiding and discharging working tunnel 2, the horizontal guiding and discharging branch pipe 52 is communicated with the horizontal guiding and discharging main gas pumping and discharging pipe 62, and a water-gas separating device is arranged at each pipeline communication position, the flat guide gas drainage main pipe 62 is communicated with a gas drainage station 9 positioned outside the hole;
gas in the main cavity pumping area enters a main cavity gas pumping and discharging pipe 61 through the main cavity pumping and discharging hole 31, the gas in the main cavity gas pumping and discharging pipe 61 is converged into a horizontal guide gas pumping and discharging pipe 62, the gas in the horizontal guide pumping and discharging area enters the horizontal guide gas pumping and discharging pipe 62 through the horizontal guide pumping and discharging hole 32, the gas enters a gas pumping and discharging station 9 positioned outside the cavity for treatment through the horizontal guide gas pumping and discharging pipe 62, and the gas enters the gas pumping and discharging station 9 outside the cavity after multi-channel water-gas separation for harmless treatment and discharging;
s5, performing combined pumping drainage effect test, considering that the main hole and the horizontal guide gas pumping drainage areas are overlapped with each other, and adopting a double-control technology for the main hole and the horizontal guide combined pumping drainage outburst elimination index to ensure construction safety, firstly, respectively calculating gas extraction amount by the main hole and the horizontal guide, and after the gas extraction rate of the main hole and the horizontal guide simultaneously meets the design requirements, performing regional outburst prevention effect test, wherein the residual gas content of the main hole and the horizontal guide coal seam is less than 5m3When the flow rate is/t, the joint pump drainage and outburst elimination is judged to be effective;
s6, in order to ensure the subsequent construction safety, after the pumping drainage outburst elimination work is finished, C25 concrete is adopted to seal and backfill the transverse passage (8), and the subsequent regional verification and the subsequent processes are respectively carried out on the main tunnel and the horizontal guide according to the coal uncovering outburst prevention requirement of the gas outburst tunnel.
In the embodiment, due to the fact that the stinger rock tunnel main tunnel and the horizontal diversion simultaneously penetrate through the gas outburst coal seam for multiple times continuously at the back inclined core part, the geological structure of the coal seam range is complex, the coal seam interval is small, the gas outburst risk is extremely high, meanwhile, the overlap of the main tunnel and the horizontal diversion drainage area is considered, the construction period is saved, the construction progress is accelerated, the construction safety is ensured, meanwhile, the main tunnel and the horizontal diversion coal seam with the back inclined range are taken as a whole, and the combined drainage outburst elimination is implemented by penetrating through all the coal seams at one time; in order to improve the gas pumping and drainage outburst elimination effect and reduce the construction difficulty of pumping and drainage drilling holes, the front hole and the horizontal guide are respectively provided with independent pumping and drainage working holes; in order to save investment, the main tunnel and the horizontal guide share a set of gas pumping and exhausting system.
According to the method, the eastern ring line stingray rock gas outburst tunnel main tunnel and horizontal guide combined pumping drainage outburst elimination is adopted as a support, under the guidance of comprehensive outburst prevention measures in a four-in-one area, the main tunnel and the horizontal guide are provided with independent pumping drainage working tunnels, all coal seams are penetrated at one time to implement combined pumping drainage, and the outburst elimination index adopts a double control technology, so that the gas pumping drainage effect is effectively ensured, the construction progress is accelerated, and the coal uncovering outburst elimination construction safety is ensured; the method is directly used for guiding the blast eliminating operation of the stingray tunnel coal uncovering project, provides guidance for the blast eliminating operation of the tunnel coal uncovering under the similar geological conditions, and has important practical engineering significance.
The foregoing describes preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A method for removing outburst by pumping and draining in a combined manner of a main hole and flat guide gas of a outburst coal seam with a complex structure is characterized by comprising the following implementation steps:
s1, penetrating all coal seams at a distance of more than 20m from the coal seam at one time to implement ultra-long distance advanced geological forecast and regional risk forecast, drilling ahead holes to penetrate all the coal seams, finding out the positions and distribution characteristics of the coal seams, and bringing the coal seams in the range of the main tunnel and the horizontal guidance structure into a combined pumping and drainage range as a whole;
s2, continuing to construct according to the gas outburst tunnel to a position where the distance from the normal line of the coal seam is more than 10m, arranging a main tunnel pumping and discharging working hole (1) and a horizontal guiding and pumping and discharging working hole (2), additionally arranging a branch tunnel at a position where the distance from the horizontal guiding side to the coal seam is more than 50m as a horizontal channel (8), and communicating the main tunnel pumping and discharging working hole (1) and the horizontal guiding and discharging working hole (2) according to the horizontal guiding section, wherein the sizes of the branch tunnel and the horizontal channel (8) are equal to the horizontal guiding section, the main tunnel pumping and discharging working hole (1) is parallel to the horizontal guiding, and the main tunnel pumping and discharging working hole (1) and the horizontal guiding and discharging working hole (2) are supported according to;
s3, performing hydraulic fracturing permeability-increasing treatment on all coal seams penetrated through by the main tunnel and the horizontal guide in the main tunnel pumping and drainage working hole (1) and the horizontal guide pumping and drainage working hole (2) at one time respectively, performing combined pumping and drainage on the main tunnel and the horizontal guide, performing main tunnel pumping and drainage holes (31) on the coal seam in the forward tunnel anticline range and performing horizontal guide pumping and drainage holes (32) on the coal seam in the horizontal guide anticline range;
s4, arranging a set of pumping system in the main hole pumping and discharging working hole (1) and the horizontal guide pumping and discharging working hole (2), wherein gas in the main hole pumping and discharging area enters the pumping and discharging system through the main hole pumping and discharging hole (31), and gas in the horizontal guide pumping and discharging area enters the pumping and discharging system through the horizontal guide pumping and discharging hole (32), and is discharged after being subjected to harmless treatment by the pumping and discharging system;
s5, performing combined drainage effect inspection, namely firstly, respectively calculating gas extraction amount of the main hole and the horizontal drainage, and after the gas extraction rate of the main hole and the horizontal drainage meets the design requirements, performing regional outburst prevention effect inspection, wherein the residual gas content of the main hole and the horizontal drainage coal seam is less than 5m3When the flow rate is/t, the joint pump drainage and outburst elimination is judged to be effective;
s6, in order to ensure the subsequent construction safety, C25 concrete is adopted to plug the transverse passage (8), and the subsequent regional verification and the subsequent procedures are respectively carried out on the main hole and the horizontal guide according to the coal uncovering outburst prevention requirement of the gas outburst tunnel.
2. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 1, which is characterized in that: the combined drainage range in the step S1 includes all coal seams in the main hole and the horizontal and horizontal anticline ranges K8, K9 and K9.
3. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 1, which is characterized in that: the main hole pumping hole (31) and the guide pumping hole (32) are drilled with phi 89, and the distance between the drilled holes and the rock stratum is at least 0.5 m.
4. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 3, which is characterized in that: the hole bottom spacing of the main hole pumping hole (31) and the hole bottom spacing of the horizontal guide pumping hole (32) are both 4 m.
5. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 1, which is characterized in that: in the step S2, the tunnel face of the main tunnel pumping drainage working tunnel (1) and the tunnel face of the guide pumping drainage working tunnel (2) are both sealed by C25 airtight jet concrete with the thickness not less than 15 cm.
6. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 1, which is characterized in that: the drainage system in the step S4 comprises a main hole gas drainage pipe (61) arranged in the main hole drainage working hole (1) and a main flat guide gas drainage pipe (62) arranged in the main flat guide drainage working hole (2), the main hole gas drainage pipe (61) penetrates through the transverse channel (8) and then is communicated with the main flat guide gas drainage pipe (62), and the main flat guide gas drainage pipe (62) is communicated with a gas drainage station (9) positioned outside the hole;
positive hole is taken out and is arranged hole (31) and positive hole gas drainage branch pipe (51) intercommunication through positive hole gas drainage pipe (41), this positive hole gas drainage branch pipe (51) with positive hole gas drainage is responsible for (61) intercommunication, it draws row hole (32) to lead to take out through plat guide gas drainage pipe (42) and plat guide gas drainage branch pipe (52) intercommunication, this plat guide gas drainage branch pipe (52) with plat guide gas drainage is responsible for (62) intercommunication.
7. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 6, which is characterized in that: the main-hole gas drainage branch pipes (51) are divided into two groups and are respectively communicated with the main pipe (61), wherein one part of the main-hole drainage holes (31) are communicated with one group of the main-hole gas drainage branch pipes (51) through the main-hole gas drainage pipe (41), and the other part of the main-hole drainage holes (31) are communicated with the other group of the main-hole gas drainage branch pipes (51) through the main-hole gas drainage pipe (41).
8. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 6, which is characterized in that: the two groups of the flat guide gas drainage branch pipes (52) are respectively communicated with the main flat guide gas drainage pipe (62), one part of the flat guide drainage holes (32) are communicated with one group of the flat guide gas drainage branch pipes (52) through the flat guide gas drainage pipe (42), and the other part of the flat guide drainage holes (32) are communicated with the other group of the flat guide gas drainage branch pipes (52) through the flat guide gas drainage pipe (42).
9. The method for removing outburst of the complex-structure outburst coal seam by positive hole and flat guided gas combined pumping and drainage according to claim 6, which is characterized in that: and the communication position of the main tunnel gas drainage pipe (51) and the main tunnel gas drainage pipe (61), the communication position of the main tunnel gas drainage pipe (61) and the main horizontal guide gas drainage pipe (62), the communication position of the main horizontal guide gas drainage pipe (52) and the main horizontal guide gas drainage pipe (62) and the communication position of the main horizontal guide gas drainage pipe (62) and the gas drainage station (9) are respectively provided with a water-gas separation device (7).
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