A method for arranging mine field development tunnels

Abstract

The present invention belongs to the technical field of tunnel layout, and specifically refers to a method for arranging tunnels for mining field development, in which tunnel layout is performed to realize the continuity, efficiency, safety and environmental protection of the coal mining process, and the coal seam is supported and filled as it is dug; low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator are selected as filling materials after coal mining, which are combined with each other to form fillers, and the traditional way of leaving coal pillars is changed to achieve no coal pillars. At the same time, the gas in the coal mining tunnel is recovered, which ensures safety and improves economic benefits, and produces a continuous coal mining, no coal pillar, safe, energy-saving, green, economical and reasonable process, and through corresponding analysis of corresponding technical data indicators, the mining of coal seams is optimized and the resource utilization rate is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel layout, and specifically refers to a method for arranging tunnels for mining field development. Background Art

[0002] When the existing pit bottom parking lot and the development tunnel are arranged in the coal seam, certain protective coal pillars need to be left to ensure the safety of the coal mining process.

[0003] As for the retained coal pillars, the amount of coal counted from multiple retained coal pillars is huge, and this type of coal seam cannot be mined; at the same time, the mining area tunnels also contain a certain amount of protective coal pillars that cannot be mined normally, which is undoubtedly an obstacle to the utilization of resources; according to tradition, most of the tunnels and pit bottom parking lots are arranged in rock strata, which costs 2-3 times more than tunnels arranged in coal seams, and the waste of funds increases exponentially; large sections of coal resources in the mining area are retained underground, and the service life of the mine is reduced by 30%; the coal seams are weathered and squeezed underground for a long time, thereby releasing a large amount of gas, which brings a hazard to the safety of the pit bottom area that cannot be ignored. Summary of the invention

[0004] In view of the defects of the prior art, the present invention discloses a method for arranging mine field development tunnels, in which the entire mining tunnel is arranged along the coal seam, and the internal tunnel layout of the mine bottom is designed to realize a continuous, efficient, safe and environmentally friendly coal mining process; the mining method is adjusted, and the filling of materials is used to achieve a pillar-free coal mining process, thereby ensuring safety and maximizing economic benefits and protecting the environment, further increasing the mining life of the coal mine and reducing costs.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for arranging a mine field development tunnel, the method comprising the following steps:

[0006] Step 1: dig the main well, auxiliary well, filling well, return air well, ventilation well and communication well on the ground of the well field, arrange the well bottom parking lot along the development direction of the coal seam, and arrange the first main lane, the second main lane and the longitudinal lane on the well bottom parking lot;

[0007] Step 2: arranging the main shaft laneway on both sides along the bottom of the main shaft, arranging the auxiliary shaft laneway on both sides along the bottom of the auxiliary shaft, arranging the connecting laneway on both sides along the bottom of the connecting shaft, one end of the connecting laneway is connected with the main shaft laneway and the auxiliary shaft laneway, and the other end of the connecting laneway is connected with the first main laneway;

[0008] Step 3: Arrange filling lanes along the bottom of the filling well to both sides, the two ends of the filling lanes are connected to the first main lane and the second main lane respectively, and arrange a filling temporary storage area on the filling lanes;

[0009] Step 4: Arrange return air lanes on both sides along the bottom of the return air shaft, and the return air lanes on both sides are connected to the first main lane and the second main lane respectively;

[0010] Step 5. Arrange ventilation tunnels on both sides along the bottom of the ventilation shaft, arrange a gas test area I at one end of the ventilation tunnel, and the end of the gas test area I is connected to the first main tunnel, and arrange a gas test area II at the other end of the ventilation tunnel, and the end of the gas test area II is connected to the second main tunnel.

[0011] Furthermore, the first main tunnel described in step one includes a first coal mining and transportation tunnel and a first filling material transportation tunnel, the second main tunnel includes a second coal mining and transportation tunnel and a second filling material transportation tunnel, the longitudinal tunnel includes a longitudinal coal mining and transportation tunnel and a longitudinal filling material transportation tunnel, a bottom coal bunker is arranged at the front end of the first coal mining and transportation tunnel, a coal mining temporary storage area is arranged on the second coal mining and transportation tunnel, and a bottom filling bunker is arranged at the front end of the second filling material transportation tunnel. One side of the main shaft tunnel described in step two is connected with the first coal mining and transportation tunnel, and the other side of the main shaft tunnel is connected with one side of the auxiliary shaft tunnel. A manhole connected to the ground is arranged on the main shaft tunnel, and the other side of the auxiliary shaft tunnel described in step two is connected with the second coal mining and transportation tunnel. A connected auxiliary shaft auxiliary tunnel is arranged along the other side of the auxiliary shaft tunnel, and the other side of the auxiliary shaft auxiliary tunnel is connected with the second coal mining and transportation tunnel.

[0012] Furthermore, in step one, stage gas recovery lanes are arranged on both sides along the first filling transport lane and the second filling transport lane respectively, the stage gas recovery lanes include stage gas recovery lane I and stage gas recovery lane II, a support area is arranged outside the stage gas recovery lanes, and a solid area is arranged on one side of the support area.

[0013] Furthermore, a hydraulic support area, a 3D printing area, a filling bearing area and an isolation zone are arranged between the bottom pit yard described in step one and the coal seam, wherein the isolation zone is adjacent to the longitudinal tunnel, a coal mining working face II is arranged adjacent to the longitudinal tunnel, a filling tunnel II is arranged along the coal mining working face II, and a stop mining area is arranged at the edge of the coal seam.

[0014] Furthermore, the tunneling technology is used to vertically advance the digging support filling process in the coal seam, and the specific steps are as follows:

[0015] S1. Mining coal by longitudinal excavation, leaving goaf;

[0016] S2, the top of the goaf left in step S1 is supported by a single hydraulically-connected top beam support, and the inner wall of the goaf is supported by anchor rods and anchor net cables to form a support tunnel;

[0017] S3. Fill the support tunnel formed in step S2.

[0018] Furthermore, the materials used for filling the supporting tunnel are composed of low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator, and the mass percentage of low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator is 40%:30%:25%:1.5%:3.5%.

[0019] Furthermore, the strength safety factor of the material used for supporting tunnel filling is calculated:

[0020] ;

[0021] W shear strength, MPa;

[0022] τ is the shear stress, MPa;

[0023] c is the cohesion, MPa;

[0024] σ is the tensile strength, MPa;

[0025] a is the internal friction angle, degrees.

[0026] Furthermore, the safe concentration control range of the gas in the ventilation tunnel is ≤0.3%;

[0027] The gas content in the ventilation tunnel Calculation, cubic meters per ton:

[0028] ;

[0029] a and b are the adsorption constants of coal, cubic meters per ton, MPa;

[0030] p is the gas pressure, MPa;

[0031] M is the moisture content in coal, %;

[0032] n is an empirical constant;

[0033] is the adsorption temperature of coal, degrees Celsius;

[0034] t is the gas temperature, degrees Celsius;

[0035] A is the ash content in coal, %;

[0036] K is the pore volume per unit mass of coal, cubic meters per ton;

[0037] k is the gas compression coefficient, which takes a value of 1.06.

[0038] The beneficial effects achieved by the present invention are as follows:

[0039] The present invention provides a method for arranging mine field development tunnels, which arranges underground tunnels along coal seams, arranges filling wells and filling bins at the bottom of the mine parking lot, ensures that the goaf after mining can be filled in time to meet the safety needs of production, arranges ventilation wells and gas testing areas underground to be interconnected, and arranges the gas testing areas adjacent to the first main tunnel and the second main tunnel to control the gas concentration in the tunnels. The overall design improves coal mining efficiency, and coal mining without coal pillars and filling is achieved in an orderly alternating coal mining method.

[0040] The present invention provides a method for arranging a mine field development tunnel, in which a filling transport tunnel is arranged along a coal mining and transport tunnel, and the tunnel is filled after mining and support, thereby changing the losses caused by leaving coal pillars in the past. In addition, this type of arrangement method arranges the coal mining and transport tunnel and the filling transport tunnel adjacent to each other, thereby realizing a continuous process of supporting as mining progresses and filling as support progresses. A stage gas recovery tunnel combined with a gas testing area is arranged at a position adjacent to the filling transport tunnel, thereby reducing the gas concentration range in the tunnel to within a safe range.

[0041] The present invention provides a method for arranging mine field development tunnels, which mines coal pillars remaining from previous coal mining processes to achieve a coal mining process without coal pillars, and selects effective filling materials such as low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber materials and accelerators to fill the tunnels, thereby ensuring the safety of the goaf and increasing the mining life of the coal seams, so that the coal seam resources with existing coal pillars can be utilized. The greatest advantages of this mining method are that it is free of coal pillars, safe, energy-saving, green, economical and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A simplified diagram of a well field development tunnel arranged by the well field development tunnel arrangement method provided by the present invention;

[0043] Figure 2 This is a simplified diagram of mining and filling in coal mining work area I according to an embodiment of the present invention;

[0044] Among them, 1. Main shaft, 101, main shaft tunnel 1, 102, main shaft tunnel 2, 2. Auxiliary shaft, 201, auxiliary shaft tunnel 1, 202, auxiliary shaft tunnel 2, 3. Filling shaft, 301, filling tunnel 1, 302, filling tunnel 2, 4. Return air shaft, 5. Coal mining temporary storage area, 6. Communication shaft, 7. Communication tunnel, 701, communication tunnel 1, 702, communication tunnel 2, 8. Coal bunker at the bottom of the shaft, 9. Filling temporary storage area, 10. Filling bunker at the bottom of the shaft, 11. Ventilation shaft, 11 01. Ventilation tunnel 1, 1102. Ventilation tunnel 2, 12. Manhole, 13. Auxiliary tunnel of auxiliary shaft, 14. Gas test area I, 15. Gas test area II, 16. Support area I, 17. Hydraulic support area, 18. 3D printing area, 19. Filling bearing area, 20. Isolation belt, 21. First main tunnel, 2101. First coal mining and transportation tunnel, 2102. First filling material transportation tunnel, 22. Second main tunnel, 2201. Second coal mining and transportation tunnel Road, 2202, second filling transport roadway, 23, longitudinal roadway, 2301, longitudinal coal mining and transport roadway, 2302, longitudinal filling transport roadway, 24, solid wall column, 25, return air roadway, 2501, return air roadway 1, 2502, return air roadway 2, 26, wall I, 27, wall II, 28, stage gas recovery roadway I, 29, support area I, 30, stage gas recovery roadway II, 31, support area II, 32, coal mining working face I, 33. Filling tunnel I, 34. Filling tunnel II, 35. Coal mining face II, 36. Coal mining face III, 37. Filling tunnel III, 38. Coal mining working area I, 39. Coal mining working area II, 40. Coal mining working area III, 41. Stop mining area, 42. Return air door I, 43. Return air door II, 44. Mine bottom parking lot, 45. Coal seam, 46. Support area II, 47. Mining tunnel, 48. Support tunnel, 49. Shared tunnel.

[0045] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0048] Example:

[0049] This embodiment provides a method for arranging a mine field development tunnel, and the specific process is as follows:

[0050] The main shaft 1, the auxiliary shaft 2, the filling shaft 3, the return air shaft 4, the ventilation shaft 11 and the communication shaft 6 are arranged on the ground of the mining area; the main shaft tunnel 101 and the main shaft tunnel 2 102 are arranged on both sides along the bottom of the main shaft 1, wherein the main shaft tunnel 101 is connected with the first coal mining and transportation tunnel 2101 of the first main tunnel 21, and a manhole 12 is arranged on the main shaft tunnel 2 102; the auxiliary shaft tunnel 1 201 and the auxiliary shaft tunnel 202 are arranged on both sides along the bottom of the auxiliary shaft 2, wherein the auxiliary shaft tunnel 1 201 is connected with the main shaft tunnel 2 102, and the auxiliary shaft tunnel 1 202 is arranged on both sides along the bottom of the auxiliary shaft 2. The second coal mining and transportation lane 2201 of the second main lane 22 is connected, and the auxiliary lane 13 of the auxiliary shaft is arranged at the lower end of the auxiliary lane 202, the auxiliary lane 13 of the auxiliary shaft is connected with the second coal mining and transportation lane 2201 of the second main lane 22, and the filling lane 1 301 and the filling lane 2 302 are arranged on both sides along the bottom of the filling shaft 3, and the filling temporary storage area 9 is arranged on the filling lane 1 301 of the filling shaft 3, and the filling lane 1 301 of the filling shaft 3 is connected with the first filling transportation lane 2102 of the first main lane 21, and the filling lane 1 301 of the filling shaft 3 is connected with the first filling transportation lane 2102 of the first main lane 21. The filling tunnel 2 302 of the shaft 3 is connected to the second filling transport tunnel 2202 of the second main tunnel 22, and the return air tunnel 25 is arranged on both sides along the bottom of the return air shaft 4. The return air tunnel 25 is connected to the return air tunnel 1 2501 and the return air tunnel 2 2502. A solid wall column 24 is arranged adjacent to the return air tunnel 25. A coal mining temporary storage area 5 is arranged on the second coal mining and transport tunnel 2201 along the second main tunnel 22. A connecting tunnel 7 is arranged along the bottom of the connecting shaft 6. The connecting tunnel 1 701 and the first coal mining and transport tunnel 21 of the first main tunnel 21 are connected. 01 is connected, and the connecting tunnel 2 702 is connected between the main shaft tunnel 1 101 and the auxiliary shaft tunnel 2 202 through a common tunnel 49. A bottom coal bunker 8 is arranged at the end of the first coal mining and transportation tunnel 2101 of the first main tunnel 21, and a bottom filling bunker 10 is arranged at the end of the second filling and transportation tunnel 2202 of the second main tunnel 22. Ventilation tunnel 1 1101 and ventilation tunnel 2 1102 are arranged on both sides along the bottom of the ventilation shaft 11. A connected gas testing area I 14 is provided on the ventilation tunnel 1 1101, and the gas testing area I 14 is connected to the first coal mining and transportation tunnel 2101 of the first main tunnel 21. A connected gas testing area II 15 is arranged on the ventilation tunnel 2 1102, and the gas testing area II 15 is connected to the second coal mining and transportation tunnel 2201 of the second main tunnel 22.

[0051] A hydraulic support area 17, a 3D printing area 18, a filling bearing area 19 and an isolation belt 20 are arranged between the bottom pit yard 44 and the coal seam 45. A longitudinal tunnel 23 is arranged adjacent to the isolation belt 20, a coal mining working face II 35 is arranged adjacent to the longitudinal coal mining and transportation tunnel 2301 of the longitudinal tunnel 23, and a filling tunnel II 34 is arranged adjacent to the coal mining working face II 35; a coal mining working face I 32 is arranged adjacent to the first coal mining and transportation tunnel 2101 along the first main tunnel 21, and a filling tunnel I 33 is arranged at the edge of the coal mining working face I 32; a stage gas recovery tunnel I 28 is arranged adjacent to the first filling material transportation tunnel 2102 along the first main tunnel 21, a support area I 29 is arranged on the periphery of the stage gas recovery tunnel I 28, and a support area I 16 is arranged at the edge of the support area I 29. At the same time, the return air tunnel 25 of the return air tunnel 25 is connected to the return air door I 42 is communicated with the first main tunnel 21, and a wall I 26 is arranged on the periphery of the return air tunnel 1 2501; on the other hand, a coal mining face III 36 is arranged adjacent to the second coal mining and transportation tunnel 2201 of the second main tunnel 22, and a filling tunnel III 37 is arranged along the coal mining face III 36; a stage gas recovery tunnel II 30 is arranged adjacent to the second filling and transportation tunnel 2202 of the second main tunnel 22, a support area II 31 is arranged adjacent to the stage gas recovery tunnel II 30, and a support area II 46 is arranged at the edge of the support area II 31; at the same time, the return air tunnel 2502 of the return air tunnel 25 is communicated with the second main tunnel 22 through a return air door II 43, and a wall II 27 is arranged on the periphery of the return air tunnel 2502; a stop mining area 41 is arranged adjacent to the coal mining working area III 40.

[0052] The mining scheme adopted in this embodiment is as follows Figure 1 and 2As shown, in order to ensure the safety of the mining process in the coal seam 45, the coal seam 45 is divided into three mining areas according to actual conditions, namely, the coal mining work area I 38, the coal mining work area II 39 and the coal mining work area III 40; the coal mining work area I 38 is taken as an example to illustrate the actual coal mining situation, wherein the coal mining work area I 38 is arranged along the edge position of the filling tunnel II 34. The coal seam 45 is segmented, and the coal seam 45 is divided into zone 1, zone 2, zone 3 and zone 4 in the segmented sections. When mining the coal seam 45, the method of mining one and leaving three is followed, and the mining is carried out in sequence in the segment and in the form of excavation. During the mining process, the mining tunnel 47 is connected with the longitudinal coal mining and transportation tunnel 2301 of the longitudinal tunnel 23; the coal is mined by longitudinal excavation, leaving the goaf, and the top of the goaf is supported by a single hydraulically-equipped articulated top beam support, and the inner wall of the goaf is supported by anchor rods and anchor nets to form a support tunnel 48; for the support tunnel 48, the filling material is transported and filled in the mining tunnel 47 through the longitudinal filling material transportation tunnel 2302 of the longitudinal tunnel 23, so as to realize the continuous operation of mining, supporting and filling; in this embodiment, the four blocks are only partial examples, not all blocks.

[0053] In order to ensure the safety of the entire mining process, the support tunnel 48 after mining support is filled, and the materials used for filling the support tunnel 48 are selected from low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator according to the mass percentage of 40%:30%:25%:1.5%:3.5%, and the filling materials become fiber concrete after solidification. In the entire coal mining process, in order to maximize the benefits, safety and environmental protection, no coal pillars are left.

[0054] The composition and content of low carbon coal gangue, coarse fly ash, ordinary cement mortar and steel fiber materials are shown in Table 1:

[0055]

[0056] In order to ensure the safety of the mining area after filling, the safety factor of the filling material was analyzed through the traditional strength reserve safety factor, and the strength safety factor of the material filled in the support tunnel 48 was calculated. Calculation:

[0057] ;

[0058] W shear strength, MPa;

[0059] τ is the shear stress, MPa;

[0060] c is the cohesion, MPa;

[0061] σ is the tensile strength, MPa;

[0062] a is the internal friction angle, degrees.

[0063] The materials selected in the filling process include low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator; the following are the parameters of the filling materials used for replacement;

[0064] Table 2 shows the calculation of the safety factor of the filling material:

[0065]

[0066] From the above analysis results, it can be seen that through the analysis of the strength reserve safety factor of the materials, the cubic compressive strength and safety factor of low-carbon coal gangue, coarse fly ash and ordinary cement mortar are greater than the data of the coal body, indicating that the strength safety of the filling material is higher than the strength safety of the coal body.

[0067] For the fiber concrete after the filling material solidifies, a cube with a side length of 100 cm was tested, and an external force of 500-1000 kN was applied to detect the first crack time, the number of cracks, and the maximum width of the cracks, and the following statistics were made;

[0068] Table 3 is the fission test of filling materials:

[0069]

[0070] From the above test results, it can be seen that under the same test conditions, the initial cracking time of the mixed filling material fiber concrete is longer than that of the coal seam, the number of cracks is less than that of the coal seam, and when an external force of 1000 kN is applied, the crack width of the coal seam is 3.6 times that of the fiber concrete crack width.

[0071] Experimental example:

[0072] According to the actual situation, a coal company was approved to mine No. 4, No. 7 and No. 9 coal seams, with a mine area of ​​5.6812 cubic kilometers;

[0073] In order to ensure the safety of mining, a gas recovery tunnel is arranged along the filler transportation tunnel underground to recover the gas in the tunnel, and a gas testing area is arranged in the tunnel to control the safe concentration of gas in the tunnel to ≤0.3% to ensure that the coal mining process is not affected;

[0074] The gas content in the ventilation tunnel is calculated by the following formula: Calculation:

[0075] ;

[0076] in is the gas content, cubic meters per ton;

[0077] a and b are the adsorption constants of coal, cubic meters per ton, MPa;

[0078] p is the gas pressure, MPa;

[0079] M is the moisture content in coal, %;

[0080] n is an empirical constant;

[0081] is the adsorption temperature of coal, degrees Celsius;

[0082] t is the gas temperature, degrees Celsius;

[0083] A is the ash content in coal, %;

[0084] K is the pore volume per unit mass of coal, cubic meters per ton;

[0085] k is the gas compression coefficient, which is 1.06;

[0086] Table 4 shows the calculation of gas content as follows:

[0087]

[0088] Through calculation, it was found that the gas contents of three different coal seams 4, 7 and 9 were 3.34 cubic meters per ton, 3.28 cubic meters per ton and 3.36 cubic meters per ton respectively.

[0089] After that, the gas in the ventilation tunnel is further recovered to a safe concentration range to ensure the safety of the coal mining process. The gas recovery rate of the recovered gas is calculated based on the data of the amount of gas per unit volume before and after recovery:

[0090] ;

[0091] in is the initial proportion of gas, %;

[0092] in is the safe proportion of gas after recovery, %.

[0093] Table 5 is the calculation of gas content in coal seams:

[0094]

[0095] For different coal seams 4, 7 and 9, the amount of gas recovered is: 6.24×10 6 Cubic meters, 9.74×10 5 Cubic meters and 9.63×10 6Cubic meters. From the above calculation results, it can be seen that there is a high content of gas in the remaining coal pillar, which is undoubtedly a waste of resources. In addition, during the mining process, the recoverable gas content in the lost coal is: 1.93×10 7 Cubic meters, 2.77×10 6 Cubic meters and 3.67×10 7 Cubic meters. The mining process should be reasonable to reduce unnecessary losses.

[0096] During the mining process, the amount of coal lost by leaving protective coal pillars and the amount of coal that can be mined are shown in Table 6 below:

[0097]

[0098] Calculation of the impact of coal pillars left on mining life in the engineering quantity calculation system;

[0099] ;

[0100] Where Y is the mining life of normal coal quantity, years;

[0101] A x The coal pillar rate is the proportion of the total coal volume to the total coal seam volume, %;

[0102] B x The proportion of coal lost due to mining to the total coal volume, %;

[0103] 1-(A x +B x ) is the proportion of exploitable coal seams to the total coal seams, %;

[0104] N x is the total amount of coal in the coal seam, million tons;

[0105] N y The annual amount of coal mined is 1.2 million tons / year;

[0106] Table 7 shows the number of years that coal seam loss during mining can be mined:

[0107]

[0108] Taking into account the traditional coal mining method of leaving coal pillars, which greatly reduces the utilization rate of coal mines, the coal seam content is completely mined and filled with a mixture of low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber materials and accelerators, the industrial square coal is activated, the coal pillars in the large tunnels are eliminated, and the coal mining is replaced by green mining technology. The recovery rate is increased, the efficiency of revenue is improved, and the low tax of green mining brings economic benefits. The utilization rate of mining resources, the mine life, and the recovery rate are all outstanding advantages among the technical and economic indicators.

[0109] Furthermore, by calculating the amount of coal pillars left and mining losses, the maximum mining life of the coal pillars left, as well as the amount of coal lost during the mining process, can increase the service life of the coal seam. The calculation of the mining life X of the coal seam is:

[0110] ;

[0111] Where X is the mining life of the coal seam with coal pillars, years;

[0112] Table 8 shows the mining life of coal seams with coal pillars:

[0113]

[0114] From the above analysis results, it can be seen that for different coal seams 4, 7, and 9, the proportion of coal pillars and mining losses in the coal mining process is between 20% and 30%, which is a large amount of loss. It is a waste of resources for coal seam mining and also causes certain economic losses. In order to further improve the service life of the mine and eliminate the losses and mining losses caused by the coal pillars, in the actual mining process, the remaining coal pillars are replaced by materials, which not only ensures the safety of the mine, but also makes use of the losses of the coal seams. The total amount of coal pillars left in the three coal seams is 50 50,000 tons, and the mining service life is 4.19 years; after the filling material support was constructed during the mining process, the replacement mining of the coal pillar reserves was 17.649 million tons, and the mining service life was 14.71 years; the total mining life was 18.90 years. Therefore, from the above data analysis, it can be seen that in the process of coal mining, the use of replacement materials is crucial for the mining of coal seams, and this part is the stagnant coal in the mining area, which can be mined through technological progress. The more important point is that after constructing a new method of mining area development tunnel space, the construction of the underground filling support body is safer, more stable and more reasonable.

[0115] At the same time, the total benefits of the remaining coal pillars and mining losses are calculated as follows: During the mining process, by replacing materials, the above losses are avoided, and the final direct benefits are 34 billion yuan.

[0116] Through the above reasonable arrangement of underground tunnels, it is possible to avoid wasting resources and maximize coal seam mining while ensuring safety, eliminate coal pillars, and carry out filling, so as to achieve support as mining and filling as support, arrange bottom coal bunkers and bottom material silos, arrange resources reasonably, and integrate the return air shaft tunnel and coal seam mining processes, as well as the phased recovery of underground gas, so as to control the gas concentration in the underground tunnels within a safe range and realize safe production.

[0117] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0118] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for arranging a mine field development tunnel, characterized in that: The method comprises the following steps: Step 1: dig the main well, auxiliary well, filling well, return air well, ventilation well and communication well on the ground of the well field, arrange the well bottom parking lot along the development direction of the coal seam, and arrange the first main lane, the second main lane and the longitudinal lane on the well bottom parking lot; Step 2: arranging the main shaft laneway on both sides along the bottom of the main shaft, arranging the auxiliary shaft laneway on both sides along the bottom of the auxiliary shaft, arranging the connecting laneway on both sides along the bottom of the connecting shaft, one end of the connecting laneway is connected with the main shaft laneway and the auxiliary shaft laneway, and the other end of the connecting laneway is connected with the first main laneway; Step 3: Arrange filling lanes on both sides along the bottom of the filling well, the two ends of the filling lanes are connected to the first main lane and the second main lane respectively, and arrange a filling temporary storage area on the filling lanes; Step 4: Arrange return air lanes on both sides along the bottom of the return air shaft, and the return air lanes on both sides are connected to the first main lane and the second main lane respectively; Step 5: Arrange ventilation tunnels along the bottom of the ventilation shaft to both sides, arrange a gas test area I at one end of the ventilation tunnel, the end of the gas test area I is connected to the first main tunnel, arrange a gas test area II at the other end of the ventilation tunnel, the end of the gas test area II is connected to the second main tunnel; The first main tunnel described in step one includes a first coal mining and transportation tunnel and a first filling material transportation tunnel, the second main tunnel includes a second coal mining and transportation tunnel and a second filling material transportation tunnel, the longitudinal tunnel includes a longitudinal coal mining and transportation tunnel and a longitudinal filling material transportation tunnel, each coal mining and transportation tunnel and each filling material transportation tunnel are arranged adjacent to each other, a bottom coal bunker is arranged at the front end of the first coal mining and transportation tunnel, a coal mining temporary storage area is arranged on the second coal mining and transportation tunnel, and a bottom filling bunker is arranged at the front end of the second filling material transportation tunnel. One side of the main shaft tunnel described in step two is connected with the first coal mining and transportation tunnel, and the other side of the main shaft tunnel is connected with one side of the auxiliary shaft tunnel. A manhole connected to the ground is arranged on the main shaft tunnel, and the other side of the auxiliary shaft tunnel described in step two is connected with the second coal mining and transportation tunnel. A connected auxiliary shaft auxiliary tunnel is arranged along the other side of the auxiliary shaft tunnel, and the other side of the auxiliary shaft auxiliary tunnel is connected with the second coal mining and transportation tunnel.

2. A method for arranging mine field development tunnels according to claim 1, characterized in that: In step one, stage gas recovery lanes are arranged on both sides along the first filler transport lane and the second filler transport lane, support areas are arranged outside the stage gas recovery lanes, and a solid area is arranged on one side of the support areas.

3. A method for arranging mine field development tunnels according to claim 1, characterized in that: A hydraulic support area, a 3D printing area, a filling bearing area and an isolation zone are arranged between the bottom pit yard and the coal seam described in step one, wherein the isolation zone is adjacent to the longitudinal tunnel, a coal mining working face II is arranged adjacent to the longitudinal tunnel, a filling tunnel II is arranged along the coal mining working face II, and a stop mining area is arranged at the edge of the coal seam.

4. A method for arranging mine field development tunnels according to claim 3, characterized in that: The specific steps of the digging and filling process using tunneling technology to vertically advance in the coal seam are as follows: S1. Mining coal by longitudinal excavation, dividing the coal seam into sections and zones, mining and filling as needed, mining one and leaving three, leaving the goaf; S2, the top of the goaf left in step S1 is supported by a single hydraulically-connected top beam support, and the inner wall of the goaf is supported by anchor rods and anchor net cables to form a support tunnel; S3. Fill the support tunnel formed in step S2.

5. A method for arranging mine field development tunnels according to claim 4, characterized in that: In step S3, the materials used for filling the support tunnel are composed of low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator, and the mass percentage of low-carbon coal gangue, coarse fly ash, ordinary cement mortar, steel fiber material and accelerator is 40%:30%:25%:1.5%:3.5%.

6. A method for arranging mine field development tunnels according to claim 5, characterized in that: Calculation of safety factor of material strength used to fill the supporting tunnel: ； W shear strength, MPa; τ is the shear stress, MPa; c is the cohesion, MPa; σ is the tensile strength, MPa; a is the internal friction angle, degrees.

7. A method for arranging mine field development tunnels according to claim 1, characterized in that: The safe concentration control range of gas in the ventilation tunnel is ≤0.3%.

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