CN117627653A - Coal pillar total recovery mining method with coordinated caving and filling of adjacent long wall working surfaces - Google Patents
Coal pillar total recovery mining method with coordinated caving and filling of adjacent long wall working surfaces Download PDFInfo
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- CN117627653A CN117627653A CN202311808686.2A CN202311808686A CN117627653A CN 117627653 A CN117627653 A CN 117627653A CN 202311808686 A CN202311808686 A CN 202311808686A CN 117627653 A CN117627653 A CN 117627653A
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- 238000005065 mining Methods 0.000 title claims abstract description 418
- 239000003245 coal Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000011084 recovery Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 23
- 239000011435 rock Substances 0.000 claims description 20
- 239000000945 filler Substances 0.000 claims description 11
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000000750 progressive effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000008093 supporting effect Effects 0.000 description 30
- 230000032258 transport Effects 0.000 description 27
- 239000000463 material Substances 0.000 description 8
- 238000004891 communication Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 or gangue Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
The invention relates to the technical field of coal exploitation, in particular to a coal pillar total recovery exploitation method with coordinated caving and filling of adjacent long wall working surfaces, which comprises the following steps: dividing the mining working face of the mining area into a first mining working face, a second mining working face and a third mining working face in sequence along the width direction of the mining working face, wherein the face length of the second mining working face is larger than the face length of the first mining working face and the face length of the third mining working face, the first mining working face and the third mining working face adopt a filling method to process the top plate, and the second mining working face adopts a falling-crossing method to process the top plate. The coal pillar full recovery mining method with the coordinated collapse and filling of the adjacent long wall working surfaces reduces the filling cost and improves the coal mining rate.
Description
Technical Field
The invention relates to the technical field of coal exploitation, in particular to a long-mining short-charging coal exploitation method.
Background
The roof is processed by adopting a caving method and a filling method in the mining of the coal mine, rock stratum damage can be caused by adopting the caving method, the roof naturally caving can cause stress concentration and surrounding rock damage of a goaf adjacent to a roadway, and the roadway cannot be reused. The roof after mining is processed by a filling method, and the roof is supported by filling after coal seam excavation. The filling mining can effectively solve the problems of controlling the subsidence of the earth surface and avoiding the fracture of rock stratum, but the mining efficiency is low and the filling cost is high.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a coal pillar total recovery mining method with coordinated caving and filling of adjacent long-wall working surfaces, which does not need to separately tunnel, reduces filling cost and improves coal mining rate.
The embodiment of the invention discloses a coal pillar full recovery mining method with coordinated caving and filling of adjacent long wall working surfaces, which comprises the following steps:
dividing the mining working face of the mining area into a first mining working face, a second mining working face and a third mining working face in turn along the width direction of the mining working face, wherein the face length of the second mining working face is longer than the face length of the first mining working face and the face length of the third mining working face,
the first mining working face and the third mining working face adopt a filling method to treat the top plate, and the second mining working face adopts a cross-falling method to treat the top plate.
According to the coal pillar full-recovery mining method with the coordinated collapse and filling of the adjacent long-wall working surfaces, a roadway is not required to be solely tunneled, the filling cost is reduced, and the coal mining rate is improved.
In some implementations, the mining area is provided with a return air lane and a transport lane, the return air lane is arranged between a first mining working surface and the first mining working surface, the return air lane is communicated with a return air main lane, the transport lane is arranged on the second mining working surface and a third mining working surface, the transport lane is communicated with a transport main lane,
and arranging a return air roadway when the first mining working face is mined, and arranging a transportation roadway when the third mining working face is mined, so as to support the return air roadway and the transportation roadway.
In some implementations, the goaf formed by the first mining face is filled and the goaf formed by the third mining face is filled.
In some implementations, the goaf after the first mining face is filled is tested to determine the solidification of the filling body, and the goaf after the second mining face is filled is tested to determine the solidification of the filling body.
In some implementations, the first, second, and third production faces each employ progressive production,
and the first mining working face and the third mining working face are mined before the second mining working face, a return air roadway is arranged when the first mining working face is mined, roadway support is carried out, and the third mining working face is mined after filling of goafs formed by the first mining working face and the first mining working face is completed.
In some implementations, the first and third production faces each employ forward production, the second production face employs reverse production,
when the first mining working face is mined, an air return roadway is arranged for roadway support, the goaf of the first mining working face is filled,
and when the third mining working face is mined, arranging a conveying roadway, carrying out roadway support, filling goafs of the third mining working face, wherein the goafs of the first mining working face and the third mining working face are completely filled, and after the filler in the goafs is solidified, starting mining of the second mining working face.
In some implementations, the first, second, and third mining faces each employ a back-off mining, driving the haulage roadway and the return roadway ahead, supporting the return roadway and the haulage roadway, and then initiating mining of the first, second, and third mining faces.
In some implementations, the second mining face has a dimension b in a width direction of the mining face, and 450 m+.b+.200m.
In some implementations, the dimension of the haulage roadway in the width direction of the panel mining face is set to d, and the dimension of the return air roadway in the width direction of the panel mining face is set to e, then d and e satisfy: d=5 m.ltoreq.d.ltoreq.6 m.
In some implementations, the first production face has a face length a and the third production face has a face length c,
a and c are satisfied, a is greater than W, c is greater than W,
wherein W is the critical width of the coal pillar, and the unit is m; r is the average apparent density of the overburden rock, and the unit is kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the H is average mining depth, and the unit is m; sc is the single-drawing compressive strength of a standard test piece of a coal bed laboratory, and the unit is MPa; g is gravitational acceleration g=9.8n/kg; b is the width of the bearing overlying strata of the coal pillar, and the unit is m; h is the height of the coal pillar in the mining area and is given in m.
Drawings
FIG. 1 is a schematic view of a first production face according to an embodiment of the present invention.
FIG. 2 is a schematic illustration of a second mining face collapsing in accordance with an embodiment of the present invention.
FIG. 3 is a schematic representation of a third mining face collapse in accordance with an embodiment of the present invention.
FIG. 4 is a schematic illustration of a second mining face collapse according to an embodiment of the present invention.
Reference numerals:
a first mining working face 1, a first goaf 101, a second mining working face 2, a second goaf 201, a third mining working face 3, a third goaf 301, a return air lane 4, a transport lane 5,
mining face 10, return air main roadway 20, transport main roadway 30, mining area 40.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The embodiment of the invention discloses a coal pillar full recovery mining method with coordinated caving and filling of adjacent long wall working surfaces, which comprises the following steps:
dividing the mining face 10 of the mining area 40 into a first mining face 1, a second mining face 2 and a third mining face 3 in sequence along the width direction of the mining face 10, the face length of the second mining face 2 being greater than the face length of the first mining face 1 and the face length of the third mining face 3,
the first mining face 1 and the third mining face 3 use a filling method to treat the roof, and the second mining face 1 uses a cross-drop method to treat the roof.
The first mining working face 1, the second mining working face 2 and the third mining working face 3 are sequentially arranged from left to right, the roof is processed by adopting a caving method by the second mining working face 2, the roof is processed by adopting a filling method by the first mining working face 1 or the third mining working face 3, a goaf formed after the mining of the third mining working face 3 is set as a third goaf 301, a goaf formed after the mining of the first mining working face 1 is set as a first goaf 101, a goaf formed after the mining of the second mining working face 2 is set as a second goaf 2, the third goaf 301 and the first goaf 101 are filled, the roof above the second goaf 2 is processed by adopting a falling method,
namely, the first mining face 1 and the third mining face 3 process the third goaf 301 and the first goaf 101 by adopting a filling method, and the second mining face 2 processes the second goaf 2 by adopting a cross-drop method.
Or it can be understood that the rock strata of the third goaf 301 and the first goaf 101 are supported, and as the rock strata are integrated, the filled filling material pair of the third goaf 301 and the first goaf 101 has a certain supporting effect on the rock strata above the second goaf 2,
namely, the fillers of the third goaf 301 and the first goaf 101 support the rock layers of the first goaf 101 and the third goaf 301 to a certain extent, so as to reduce the fracture and collapse range of the rock layers of the goaf 2,
the first, second, and third mining faces 1, 2, and 3 may be mined simultaneously, or the first, second, and third mining faces 1, 2, and 3 may not be mined simultaneously.
According to the coal mining method for long-filling short mining, the second goaf 2 is subjected to caving treatment, the third goaf 301 and the first goaf 101 are subjected to filling treatment, and therefore the whole mining area 40 is not required to be filled, ground subsidence can be avoided, coal mining efficiency is improved, mining cost is reduced, and the first goaf 101 and the third goaf 301 have a certain supporting effect on the second goaf 2 after being filled, and further coal pillars are not required to be reserved, so that coal mining efficiency and coal mining rate are improved.
In some implementations, the panel 40 is provided with a return air lane 4 and a transport lane 5, the return air lane 4 being provided between the first mining face 1 and the first mining face 1, the return air lane 4 being in communication with the return air main lane 20, the transport lane 5 being provided between the second mining face 2 and the third mining face 3, the transport lane 5 being in communication with the transport main lane 30,
the return air lane 4 is arranged when the first mining working face 1 is mined, the transportation lane 5 is arranged when the third mining working face 3 is mined, and the return air lane 4 and the transportation lane 5 are supported.
Specifically, as shown in fig. 1 to 4, the mining area 40 is provided with a return air lane 4 and a transport lane 5, the return air lane 4 and the transport lane 5 extend in the front-rear direction, the return air lane 4 is arranged between the first mining face 1 and the second mining face 2, the return air lane 4 is used for ventilation of the mining area 40, the transport lane 5 is arranged between the second mining face 2 and the third mining face 3, the transport lane 5 is used for transporting materials and conveying coal, when the mining machine is used for mining on the first mining face 1 and the third mining face 3, the mining machine is pushed in the coal mining direction, the anchor bolt supporting machine supports the transport lane 5 and the return air lane 4, namely, the tunnel is formed by cutting coal by the mining machine, supporting construction equipment is arranged in the transport lane 5 or the return air lane 4 to support the return air lane 4 and the transport lane 5, for example, a bolt machine is used for supporting, and further, the anchor bolt supporting is finished, or existing supporting devices or supporting equipment such as a support frame or a support are used for supporting the mining face 3, and meanwhile, when the mining machine is used for supporting the transport lane 5 is used for supporting the mining face 1 and the third mining face 3, namely, the ventilation area is arranged in the left side of the mining area 4, namely, the return air lane 4 is arranged in the coal mining area, and the right side of the mining face 4 is prevented from being in the coal mining area, and the air return air channel 4 is arranged in the direction, and the left side of the mining face is convenient to be in the mining area, and the air ventilation direction is arranged.
Meanwhile, the transportation roadway 5 and the return air roadway 4 can be used for transporting the filler, so that the first goaf 101 of the first mining working face 1 or the third goaf 301 of the third mining working face 3 is filled and grouted, the mining efficiency is improved, meanwhile, the first mining working face 1 and the third working face 3 are subjected to supporting after coal mining, cross operation of coal dropping and supporting is avoided, the time of roadway supporting is saved, the coal dropping is avoided, or the coal dropping is avoided.
According to the long-charging short-mining coal mining method, after the first mining working face 1 and the third mining working face 3 are mined, supporting construction equipment is arranged in a roadway to complete the supporting of an anchor rod supporting, a shed supporting or a roadway support and the like on the return air roadway 4 or the conveying roadway 5, further the arrangement of the return air roadway 4 and the conveying roadway 5 is completed, the coal falling is convenient to convey during construction, the concentration of gas or carbon dioxide in a mining area 40 is prevented from being too high, after coal falling of a coal mining machine is carried out, the supporting operation of the coal falling and the supporting operation is achieved through an anchor rod machine, and the coal mining efficiency is improved.
In some implementations, the goaf formed by the first mining face 1 is filled and the goaf formed by the third mining face 3 is filled.
Specifically, as shown in fig. 1 to 4, when the first mining face 1 advances to mine, and after the support of the post-mining return air roadway 4 is completed, the first goaf 101 is filled, grouting filling is performed by providing a ground filling station and a downhole filling station, for example, the ground filling station is adapted to provide a filler, the downhole filling station is connected with the ground filling station to grouting the filler to the first goaf 101, and further advancing of the first mining face 1 is continued,
as the third mining face 3 advances to mine, and after the completion of the support of the post-mining haulage roadway 5, the third goaf 301 is filled, grouting filling is performed by providing a ground filling station and a downhole filling station, for example, the ground filling station is adapted to provide a filling material, the downhole filling station is connected to the ground filling station to grouting the filling material into the third goaf 301, and further advancing of the third mining face 3 is continued,
according to the coal mining method for long-filling short mining, the third goaf 301 and the first goaf 101 are filled, so that coal pillars do not need to be reserved for supporting rock formations above the goafs, the coal mining rate is improved, the transportation roadway 5 and the return air roadway 4 do not need to be driven in advance independently, and the coal mining cost is reduced.
In some implementations, the goaf after the first mining face 1 is filled is tested to determine the solidification of the filling body, and the goaf after the third mining face 3 is tested to determine the solidification of the filling body.
Specifically, as shown in fig. 1 to 4, the fillers of the first goaf 101 and the third goaf 301 are tested to check whether the fillers are solidified and formed, and the fillers may be cement grouting fillers, or gangue, sand, municipal refuse near mining areas, etc. on site.
In some implementations, the first, second and third production surfaces 1, 2 and 3 each employ progressive production,
the first mining working face 1 and the third mining working face 3 mine before the second mining working face 2, when the first mining working face 1 mines, a return air roadway 4 is arranged for roadway support, and after filling of a goaf formed by the first mining working face 1 or the third mining working face 3 is completed, the second mining working face 2 mines.
Specifically, as shown in fig. 1 to 4, the primary mining face 1 performs forward mining, for example, the primary mining face 1 starts mining from one end adjacent to the major transportation lane 30 and the major return lane 20, and proceeds in a direction away from the major transportation lane 30 and the major return lane 20. That is, the first mining face 1 is mined from the rear end to the front end of the mining area 40, and similarly, the third mining face 3 is mined in a forward direction, for example, the third mining face 3 is mined from one end adjacent to the major haulage roadway 30 and the major return roadway 20, and is mined in a direction away from the major haulage roadway 30 and the major return roadway 20. I.e., the third mining face 3 is mined from the rear end to the front end of the panel 40,
when the first mining working face 1 is mined, the roof bolter carries out anchor bolt support after the coal dropping machine finishes coal dropping, the return air lane 4 is supported, when the third mining working face 3 is mined, the roof bolter carries out anchor bolt support after the coal dropping machine finishes coal dropping, the transportation lane 5 is supported, the second mining working face 2 carries out mining from the rear end of the mining area 40 to the front end of the mining area 40,
it can be understood that the first mining working surface 1 and the third mining working surface 3 may be mined in advance, the return air lane 4 is arranged when the first mining working surface 1 is mined, the transportation lane 5 is arranged when the third mining working surface 3 is mined, and after the first mining working surface 1 and the third mining working surface 3 are mined for a certain distance, the filling of the first goaf 101 and the third goaf 301 is performed in time, so that the impact of the transportation lane 5 or the return air lane 4 caused by the collapse of the first goaf 101 and the third goaf 301 is avoided. Personnel and equipment in the transport lane 5 and the return lane 4 are protected.
After filling the goaf formed by the first mining working face 1 or the third mining working face 3, the second mining working face 2 is mined,
it can be understood that after the first mining face 1 and the third mining face 3 are mined for a certain distance, the first goaf 101 and the third goaf 301 are filled, that is, coal mining of the second mining face 2 is started, that is, positions corresponding to the first goaf 101 and the third goaf 301 in the left-right direction of the coal mining position of the second mining face 2 are filled, and further when the second mining face 2 is mined, the left end and the right end of the second mining face 2 are provided with filling body supports, so that stability and safety when the second mining face 2 is mined are improved.
Or, after the mining of the first mining working face 1 and the third mining working face 3 is completed, and after the filling of the first goaf 101 and the third goaf 301 is completed, the coal mining of the second mining working face 2 is started, so that the stability and safety of the coal mining of the second mining working face 2 are improved.
In some implementations, the first and third production surfaces 1, 3 each employ forward production, the second production surface 2 employs reverse production,
when the first mining working face 1 is mined, the return air roadway 4 is arranged to carry out roadway support, the goaf of the first mining working face 1 is filled,
and when the third mining working face 3 is mined, a conveying roadway is arranged, roadway support is carried out, goafs of the third mining working face 3 are filled, the first mining working face 1 and the goafs of the third mining working face 3 are filled, and after filling is finished, the mining of the second mining working face 2 is started after filling in the goafs is solidified.
Specifically, as shown in fig. 1 to 4, the first mining face 1 and the third mining face 3 are mined in advance, the return air lane 4 is arranged when the first mining face 1 is mined, the transport lane 5 is arranged when the third mining face 3 is mined, and after the first mining face 1 and the third mining face 3 are mined for a certain distance, the first goaf 101 and the third goaf 301 are filled and the transport lane 5 and the return air lane 4 are supported, so that the first goaf 101 and the third goaf 301 are prevented from collapsing to impact the transport lane 5 or the return air lane 4. Personnel and equipment in the transport lane 5 and the return lane 4 are protected.
After the mining of the first mining working face 1 and the third mining working face 3 is completed, and after the filling of the first goaf 101 and the third goaf 301 is completed, the back-off mining of the second mining working face 2 is started, namely, the mining is performed from the front end to the rear end, so that the stability and the safety of the mining of the second mining working face 2 are improved.
According to the coal pillar full recovery mining method with coordinated caving and filling of the adjacent longwall working surfaces, both the first mining working surface 1 and the third mining working surface 3 adopt forward mining, a roadway is arranged during mining, namely, a conveying roadway 5 and a return air roadway 4 are arranged, material transportation is carried out through the return air roadway 4 before the second mining working surface 2 is mined, coal transportation is carried out through the conveying roadway 5 during the mining of the second mining working surface 2, the coal mined by the second mining working surface 2 is transported, further, a driving roadway is not required to be advanced to form the conveying roadway 5 or the return air roadway 4, cost is reduced, and after the first goaf 101 and the third goaf 301 are filled, coal pillars are not required to be reserved, so that the backward mining of the second mining working surface 2 is carried out, and coal mining amount and coal mining stability and safety of a mining area 40 are improved.
Further, after the first and third mining faces 1 and 3 are mined by a predetermined distance, goaf of the first and third mining faces 1 and 3 are filled. Firstly, supporting the transport roadway 5 and the return roadway 4, and then filling goafs of the first mining working face 1 and the third mining working face 3, namely filling the first goafs 101 and the third goafs 301, so that coal falling and supporting are not interfered, coal mining efficiency is improved, supporting and filling operations are not interfered, and supporting and filling efficiency is improved.
In some implementations, the second mining face 2 has a dimension b in the width direction of the mining face 10, and 450 m+.b+.200m.
Specifically, as shown in fig. 1 to 4, the dimension of the second mining face 2 in the left-right direction is b, and b satisfies 450 m.gtoreq.b.gtoreq.200m, and further the face length of the second mining face 2 may be set to increase the coal mining amount, and b may be 450m, 430m, 400m, 350m, 300m, 290m, 230m, 240m, 220m, 210m, 200m.
By setting the surface length of the second mining working face 2 in the left-right direction, the first goaf 101 and the third goaf 301 after filling have limited supporting effect on the rock stratum above the mining area 40, and the ground subsidence caused by the collapse of the second goaf 201 due to the overlong surface length of the second mining working face 2 is avoided. Meanwhile, the phenomenon that the size of the mining area 40 in the left-right direction is smaller due to the fact that the surface length of the second mining working face 2 is too small is avoided, the first goaf 101 and the second goaf 301 are used for processing the goafs in a filling mode, the whole mining area 40 is high in filling cost, the coal mining cost can be controlled through the arrangement of the size of the second mining working face 2 in the left-right direction, and the coal mining face is prevented from sinking.
In some embodiments, the first, second and third mining face 1, 2 and 3 are each mined in a back-off manner, the haulage roadway 5 and the return roadway 4 are advanced, the support is performed in the return roadway 4 and the haulage roadway 6, and then mining of the first, second and third mining face 1, 2 and 3 is started.
Specifically, as shown in fig. 1 to 4, the first mining face 1, the second mining face 2 and the third mining face 3 each mine from the front end to the rear end of the mining area 40, that is, mine from the end of the mining area 40 away from the haulage main roadway 30 toward the direction adjacent to the haulage main roadway 30, advance the return air roadway 4 and the haulage roadway 5 before mining, support the return air roadway 4 and the haulage roadway 5, and thus open the mining of the first mining face 1, the second mining face 2 and the third mining face 3, the first mining face 1 and the third mining face 3 may mine prior to the second mining face 2, or the first mining face 1 and the third mining face 3 mine simultaneously with the second mining face 2, and when the first mining face 1 and the third mining face 3 mine, the preset goaf of the first mining face 1 and the third mining face 3 is to be filled after the mining distance of the first mining face 1 and the third mining face 3. Thereby realizing that the coal falling does not interfere with the support, improving the coal mining efficiency, realizing that the support does not interfere with the filling operation, and improving the support and filling efficiency. By tunneling the transport roadway 5 and the return air roadway 4 in advance, the rock stratum above the mining area 40 can be supported, and the stability and safety of coal mining of the mining area 40 are improved. And the first mining working face 1 and the third mining working face 3 adopt filling to treat the goaf, the second mining working face 2 adopts a cross-falling method to treat the goaf, the rock stratum of the mining area 40 is supported, and the filling cost is reduced while the ground subsidence is avoided.
In some implementations, the dimension of the haulage roadway 5 in the width direction of the mining face 10 of the mining area 40 is set to d, and the dimension of the return air roadway 4 in the width direction of the mining face 10 of the mining area 40 is set to e, then d and e satisfy: d=5 m.ltoreq.d.ltoreq.6 m.
Specifically, as shown in fig. 1 to 4, the distances e, d and e between the return air ducts 4 in the left-right direction satisfy: d=5 m.ltoreq.d.ltoreq.7 m. For example, d and e can be 5m, 5.5m, 6.2m, 6.5m and 7.0m, and are arranged according to the actual collapse condition of the second goaf 2, because the material and hardness of each layer of the rock stratum are different, the collapse amount in the collapse is different, when the collapse amount is larger, namely the number of layers of the collapsed rock stratum is larger, the d and e are set to be 7.0m, so that the transportation roadway 5 and the return roadway 4 are protected,
it will be appreciated that the dimensions of the first and third production surfaces 1, 3 in the left-right direction may be determined in dependence on the face length of the second production surface 2, for example, when the face length of the second production surface 2 is 200m, the face lengths of the first and third production surfaces 1, 3 are set to 50m,
when the surface length of the second mining working surface 2 is 450m, the surface lengths of the first mining working surface 1 and the third mining working surface 3 are set to be 100m, so that the fillers of the first goaf 101 and the third goaf 301 can have a certain supporting effect on the rock stratum above the second goaf, and the coal mining stability is improved.
And also facilitates ventilation of return air lane 4 when second mining face 2 is mining and transportation lane 5 transports coal when second mining face 2 is mining.
According to the long-charging short-mining coal mining method, d and e are set, the sizes of the return air lane 4 and the transport lane 5 in the left-right direction are set, the d and e are set according to the on-site collapse condition, and the safety and stability of mining of the second mining working face 2 are improved.
In some implementations, the first production face 1 has a face length a and the third production face 3 has a face length c, a and c being satisfied, a being greater than W, and 50m +.a=c +.100 m,
wherein W is the critical width of the coal pillar, and the unit is m; r is the average apparent density of the overlying strata, and the unit is kg/m3; h is average mining depth, and the unit is m; sc is the single-drawing compressive strength of a standard test piece of a coal bed laboratory, and the unit is MPa; g is gravitational acceleration g=9.8n/kg; b is the width of the bearing overlying strata of the coal pillar, and the unit is m;
h is the height of the coal pillar in the panel 40 in m.
Specifically, as shown in fig. 1 to 4, the coal seam close to the mining area can be subjected to trial mining, and the coal seam is sampled on site and sent to a laboratory to perform an average apparent density experiment on the overburden, wherein the average mining depth refers to the distance between the mining coal seam and the ground, namely, the average value of the distance between the mining area 40 and the ground. h is the height of the coal pillar within the panel 40. The width of the coal pillar bearing cover rock is the dimension of the coal pillar, which is not collapsed and broken, in the left-right direction, of the direct roof, so that W is calculated, and 50m is less than or equal to a=c is less than or equal to 100m, the surface length range of the first mining working face 1 and the third mining working face 3 is further conveniently estimated by site personnel, the surface lengths of the first mining working face 1 and the third mining working face 3 are determined according to the coal mining dimension of actual coal mining equipment in the left-right direction, the surface lengths of the first mining working face 1 and the third mining working face 3 are prevented from being too small, the rock stratum of the second goaf 201 cannot be provided with enough supporting effect, and the second goaf 201 is prevented from being collapsed, so that danger is caused. And meanwhile, the high cost caused by overlarge filling amount is avoided.
The coal mining method of the long-filling short mining of the embodiment of the invention limits the surface length of the first mining working surface 1 and the third mining working surface 3, so that the first goaf 101 and the third goaf 301 after filling can provide a certain supporting effect for the rock stratum above the second goaf 2, and the safety and the stability of coal mining of the second mining working surface 2 are improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The coal pillar full recovery mining method with the coordination of the collapse and the filling of the adjacent long-wall working surfaces is characterized by comprising the following steps:
dividing the mining working face of the mining area into a first mining working face, a second mining working face and a third mining working face in turn along the width direction of the mining working face, wherein the face length of the second mining working face is longer than the face length of the first mining working face and the face length of the third mining working face,
the first mining working face and the third mining working face adopt a filling method to treat the top plate, and the second mining working face adopts a cross-falling method to treat the top plate.
2. The method for fully recovering and mining the coal pillar with the coordinated collapse and filling of the adjacent longwall working face according to claim 1, wherein,
the mining area is provided with an air return roadway and a transportation roadway, the air return roadway is arranged between a first mining working surface and the first mining working surface, the air return roadway is communicated with an air return main roadway, the transportation roadway is arranged on a second mining working surface and a third mining working surface, the transportation roadway is communicated with the transportation main roadway,
and arranging a return air roadway when the first mining working face is mined, and arranging a transportation roadway when the third mining working face is mined, so as to support the return air roadway and the transportation roadway.
3. The method for fully recovering and mining the coal pillar with the coordinated collapse and filling of the adjacent longwall working face according to claim 2, wherein,
and filling the goaf formed by the first mining working face, and filling the goaf formed by the third mining working face.
4. The method for fully recovering and mining coal pillars with coordinated collapse and filling of adjacent longwall faces according to claim 3, wherein the goaf after filling of the first mining face after filling is tested to determine solidification of the filling body, and the goaf after filling of the second mining face is tested to determine solidification of the filling body.
5. The method for fully recovering and mining the coal pillar with the coordinated collapse and filling of the adjacent longwall face according to claim 4, wherein,
the first, second and third production faces each employ progressive production,
and the first mining working face and the third mining working face are mined before the second mining working face, a return air roadway is arranged when the first mining working face is mined, roadway support is carried out, and the second mining working face is mined after filling of goafs formed by the first mining working face and the third mining working face is completed.
6. The method for fully recovering and mining the coal pillar with the coordinated collapse and filling of the adjacent longwall face according to claim 4, wherein,
the first mining working surface and the third mining working surface adopt forward mining, the second mining working surface adopts backward mining,
when the first mining working face is mined, an air return roadway is arranged for roadway support, the goaf of the first mining working face is filled,
and when the third mining working face is mined, arranging a conveying roadway, carrying out roadway support, filling goafs of the third mining working face, wherein the goafs of the first mining working face and the third mining working face are completely filled, and after the filler in the goafs is solidified, starting mining of the second mining working face.
7. The method for fully recovering and mining coal pillars with coordinated collapse and filling of adjacent longwall faces according to claim 1, wherein the first mining face, the second mining face and the third mining face adopt backward mining, the transportation roadway and the return roadway are advanced, the return roadway and the transportation roadway are supported, and mining of the first mining face, the second mining face and the third mining face is started.
8. The method for fully recovering and mining coal pillars with coordinated collapse and filling of adjacent longwall faces according to claim 1, wherein the dimension of the second mining face in the width direction of the mining face is b, and 450m is greater than or equal to b and greater than or equal to 200m.
9. The method for fully recovering and mining coal pillars with coordinated collapse and filling of adjacent longwall faces according to claim 1, wherein the dimension of a transportation roadway in the width direction of a mining face of a mining area is set as d, and the dimension of a return air roadway in the width direction of the mining face of the mining area is set as e, so that d and e satisfy the following conditions: d=5 m.ltoreq.d.ltoreq.6 m.
10. The method for fully recovering and mining the coal pillar with the coordinated collapse and filling of the adjacent longwall working face according to claim 1, wherein,
the first mining face has a face length a and the third mining face has a face length c,
a and c are satisfied, a is greater than W, c is greater than W,
wherein W is the critical width of the coal pillar, and the unit is m; r is the average apparent density of the overburden rock, and the unit is kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the H is average mining depth, and the unit is m; sc is the single-drawing compressive strength of a standard test piece of a coal bed laboratory, and the unit is MPa; g is gravitational acceleration g=9.8n/kg; b is the width of the bearing overlying strata of the coal pillar, and the unit is m;
h is the height of the coal pillar in the mining area and is given in m.
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| CN202311808686.2A CN117627653A (en) | 2023-12-26 | 2023-12-26 | Coal pillar total recovery mining method with coordinated caving and filling of adjacent long wall working surfaces |
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| CN202311808686.2A CN117627653A (en) | 2023-12-26 | 2023-12-26 | Coal pillar total recovery mining method with coordinated caving and filling of adjacent long wall working surfaces |
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