CN110714762B - Reciprocating type secondary rapid stoping method for residual coal body in thick coal seam caving coal goaf - Google Patents
Reciprocating type secondary rapid stoping method for residual coal body in thick coal seam caving coal goaf Download PDFInfo
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- CN110714762B CN110714762B CN201911142212.2A CN201911142212A CN110714762B CN 110714762 B CN110714762 B CN 110714762B CN 201911142212 A CN201911142212 A CN 201911142212A CN 110714762 B CN110714762 B CN 110714762B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Abstract
The invention relates to the field of coal mining, in particular to a reciprocating type secondary quick stoping method for residual coal bodies in a thick coal seam caving coal goaf. In order to solve the problems of low caving coal recovery rate, difficult construction of a roadway of a re-mining working face, complex construction process and the like in the prior art, the reciprocating type secondary rapid stoping method of the residual coal body in the caving coal goaf of the thick coal seam is provided. The method comprises the steps of firstly, protecting coal pillars on two sides of a goaf and arranging a re-mining working face in the goaf, wherein an air return roadway of the re-mining working face is directly communicated with an air return upward mountain or a large roadway and an auxiliary air return upward mountain. And then, arranging cutting holes along the upward mountain of the mining area, keeping a certain offset distance between a driving working surface and a stoping working surface of the haulage roadway to form front driving and rear mining, and meanwhile, building a wall body on the side of the mining area to carry out gob-side entry retaining. After the working face is communicated with the boundary auxiliary return air mountain climbing coal pillars, the support is gradually withdrawn to the corresponding position of the continuous working face, and the gob-side entry retaining and the previous stoping working face are adopted to carry out stoping by adopting the same process. Therefore, the ventilation mode of the mining area is improved, and the reciprocating type secondary rapid stoping method for recovering the residual coal of the goaf and the coal pillars of the mining area in the whole range is formed by combining the gob-side entry retaining process.
Description
Technical Field
The invention relates to the field of coal mining, in particular to a reciprocating type secondary quick stoping method for residual coal bodies in a thick coal seam caving coal goaf.
Background
When coal mining is carried out on a thick coal seam mine, a top coal caving mining method is mostly selected and used, and the method has the advantages of high yield and high efficiency. However, in the fully mechanized caving mining of the thick coal seam, the loss caused by the incapability of coal caving in the initial and final mining, the loss caused by the incapability of coal caving in the transition supports and the end supports at the two ends of the working face, the residual coal loss in the goaf caused by the coal caving process and the like are caused. The coal resources left in the goaf have relatively large thickness, good coal quality and even pure coal zones with considerable thickness.
The coal pillars left in the goaf are divided into roadway protecting coal pillars and isolating coal pillars according to the function of the coal pillars. The roadway protecting coal pillars are reserved for supporting the roadway, and the isolating coal pillars are reserved for isolating the goaf. And after the lane protection and the isolation mission of the coal pillar are finished, the coal pillar is better in occurrence integrity and is recycled. The leftover coal resources abandoned in the goaf are distributed in block sections, the coal bed is complete, and the residual coal in the goaf can be recovered by combining the re-mining.
Due to the continuous mining, resources with good occurrence state become less and less, and the secondary mining is carried out on the mine, so that the problem of low recovery rate of the original top coal caving can be greatly improved, the mining relation is relieved, and the service life is prolonged. However, when roadway excavation and stoping are carried out in the goaf, the top plate is extremely broken and easy to collapse, and the goaf is exposed for a long time, so that the original lost loose float coal is easy to generate natural ignition. The method has important significance for protecting and utilizing coal resources by quickly and effectively recovering residual coal and coal pillars in the goaf.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a reciprocating type secondary rapid stoping method for residual coal bodies in a thick coal seam caving coal goaf, so as to solve the problems of low caving coal recovery rate, difficult roadway construction of a stope face and the like in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the reciprocating type secondary quick stoping method of the residual coal body in the thick coal seam caving coal goaf comprises the following processes:
a. normally arranging a top coal caving stoping working face according to the prior method, caving coal collapses in a goaf after stoping is finished, and protecting coal pillars at two sides of the goaf and arranging a stoping working face in the goaf;
b. tunneling a stope face return air roadway in a coal column at one side of the goaf, communicating with a return air ascending or a large roadway and an auxiliary return air ascending, tunneling a stope face transport roadway in a coal column at the other side of the goaf from the transport ascending or the large roadway, communicating with the stope face return air roadway to form a cut hole;
c. during the mining of the re-mining working face, a certain offset distance is kept between the driving working face of the haulage roadway and the re-mining working face to form front driving and rear mining, and the side masonry wall body of the mining area of the re-mining working face is used as an air inlet roadway of the next working face;
d. after the secondary stope face is communicated with the boundary auxiliary return air mountain climbing non-coal pillar, the support is gradually withdrawn to the corresponding position of the continuous working face, and the secondary stope face reciprocating mining is realized by utilizing the same process of the gob-side entry retaining and the previous secondary stope face and the opposite direction.
In the reciprocating type secondary quick stoping method for the residual coal body in the thick-seam caving coal goaf, the stoping range of the stoping face in the step a comprises the lost top coal of the original caving goaf and the lost protective coal pillars on the two sides of the original caving goaf.
In the reciprocating type secondary quick stoping method for the residual coal body in the thick coal seam caving coal goaf, the cutting holes of the stope face in the step b are arranged along the upper mountain or the big lane of the mining area in the protective coal pillar.
According to the reciprocating type secondary quick stoping method for the residual coal body in the thick coal seam caving coal goaf, the ventilation mode of the stope face in the step c is a Z-shaped ventilation mode, and the haulage roadway of the stope face is dug in front and is retained along the back along the goaf.
According to the reciprocating type secondary quick stoping method for the residual coal body in the thick coal seam caving coal goaf, no coal pillar penetration is realized between the final stoping of the stoping working face and the auxiliary return air main roadway in the step d, and quick withdrawal is realized from far to near according to the distance between the bracket and the cut hole of the continuous working face.
The reciprocating type secondary quick stoping method for the residual coal body in the thick coal seam caving coal goaf provided by the invention has the following advantages:
(1) the method can greatly improve the extraction rate of the thick coal seam, recover residual coal in the goaf, and recover coal pillars between sections and coal pillars protected by a large roadway, can recover coal resources to the maximum extent, and is favorable for protecting the coal resources.
(2) Through the combination of the Z-shaped ventilation mode of the front excavation and the rear excavation of the haulage roadway and the support withdrawing process, the maintenance time of the stope face staying in the goaf and the haulage roadway is shortened, and the wind pressure difference is formed on the two sides of the residual coal in the goaf, so that the risk that the natural ignition of the float coal is lost when the top coal is put away in the goaf is comprehensively solved.
(3) And the original roadway arrangement system is utilized to relieve the mine excavation relation. The construction process is simplified by using the mining area large roadway, the time for moving and reversing the working faces between the working faces is reduced, and the production efficiency of the stope face is ensured.
Drawings
FIG. 1 is a schematic diagram of a first mining surface of a reciprocating type secondary rapid stoping method for residual coal bodies in a thick-seam caving coal goaf
FIG. 2 is a schematic diagram of a connection surface of a reciprocating type secondary rapid stoping method for residual coal bodies in a thick coal seam caving coal goaf
In the figure:
1-caving coal face; 2-auxiliary return air goes up the hill; 3-transporting to the mountain; 4-return air of the mining area goes up the mountain; 5-stope face; 6-return air tunnel of the stope face; 7-stope face haulage roadway; 8-tunneling working face; 9, building a wall body; 10-air intake sign; 11-dirty wind flag; 12-equipment transportation route; 13-continuous stoping face
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The invention provides a reciprocating type secondary rapid stoping method for residual coal bodies in a thick coal seam caving coal goaf, which comprises the steps of normally arranging a caving coal stoping working face 1 according to the existing method, caving coal collapses in the goaf after the stoping is finished, and protecting coal pillars on two sides of the goaf and arranging a re-mining working face 5 in the goaf;
and secondly, tunneling a re-mining working face air return roadway 6 in the coal pillar on one side of the goaf, communicating with an air return upper mountain or a large roadway and an auxiliary air return upper mountain 2, and tunneling a re-mining working face haulage roadway from a haulage upper mountain 3 or the large roadway in the coal pillar on the other side of the goaf, communicating with the re-mining working face air return roadway to form a re-mining working face cutting hole. The open-cut holes are arranged along the mountain climbing or the big lane in the big lane protective coal pillar;
and thirdly, during the mining period of the re-mining working face, a certain offset distance is kept between the driving working face 8 of the haulage roadway and the stoping working face 5 to form front driving and rear mining, and the maintenance time of the haulage roadway of the re-mining working face is shortened. The side masonry wall 9 of the mining area of the re-mining working face carries out gob-side entry retaining and is used as an air inlet lane of the next working face. The air flow traveling route of the stope face 5 is a Z-shaped ventilation mode of transporting to the mountain or a big lane 10 → a stope face transportation roadway 7 → a stope face 5 → a stope face return air roadway 6 → an auxiliary return air to the mountain or the big lane 2, so that the air pressure difference between the stope face return air roadway and the two sides of the residual coal in the original caving coal goaf is avoided, and the natural ignition probability is reduced. (ii) a
And fourthly, after the working surface is communicated with the boundary auxiliary return air to ascend the mountain without coal pillars, gradually withdrawing the bracket to the corresponding position of the continuous working surface 13, and withdrawing the bracket from far to near according to the distance between the bracket and the continuous working surface 13. And performing stoping in the opposite direction by using the same process of the gob-side entry retaining and the previous stoping face, so as to realize the reciprocating mining of the secondary stoping face. The wind flow traveling route of the stope face 13 is a Z-shaped ventilation mode of ascending or large transportation lane → stope face air return lane → auxiliary air return ascending or large lane.
Claims (5)
1. The reciprocating type secondary quick stoping method for the residual coal body in the thick coal seam caving coal goaf is characterized by comprising the following steps of:
a. normally arranging a top coal caving stoping working face according to the prior method, caving coal collapses in a goaf after stoping is finished, and protecting coal pillars at two sides of the goaf and arranging a stoping working face in the goaf;
b. tunneling a stope face return air roadway in a coal column at one side of the goaf, communicating with a return air ascending or a large roadway and an auxiliary return air ascending, tunneling a stope face transport roadway in a coal column at the other side of the goaf from the transport ascending or the large roadway, communicating with the stope face return air roadway to form a cut hole;
c. during the mining of the re-mining working face, a certain offset distance is kept between the driving working face of the haulage roadway and the re-mining working face to form front driving and rear mining, and the side masonry wall body of the mining area of the re-mining working face is used as an air inlet roadway of the next working face;
d. after the secondary stope face is communicated with the boundary auxiliary return air mountain climbing non-coal pillar, the support is gradually withdrawn to the corresponding position of the continuous working face, and the secondary stope face reciprocating mining is realized by utilizing the same process of the gob-side entry retaining and the previous secondary stope face and the opposite direction.
2. The reciprocating secondary rapid stoping method for the residual coal body in the thick-seam caving coal goaf according to claim 1, wherein in the step a, the stoping range of the stoping face comprises the lost top coal of the original caving goaf and the lost protective coal pillars at two sides of the original caving goaf.
3. The reciprocating secondary rapid stoping method for the residual coal body in the thick-seam caving coal goaf according to claim 1, wherein in the step b, the cut-out holes of the stope face are arranged along the upper mountain or the roadway of the mining area in the protective coal pillar.
4. The reciprocating secondary rapid stoping method for the residual coal body in the thick-seam caving coal goaf according to claim 1, wherein in the step c, the ventilation mode of the stope face is a Z-shaped ventilation mode, and the haulage roadway of the stope face is excavated in front of the stope face and is retained along the back of the stope face.
5. The reciprocating secondary rapid stoping method for the residual coal in the thick-seam caving coal goaf according to claim 1, wherein in the step d, the non-pillar penetration of the stoping face and the auxiliary return air main roadway is realized, and the rapid withdrawal is realized from far to near according to the distance between the bracket and the cut hole of the continuous working face.
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