CN110714761B

CN110714761B - Method for re-mining residual coal body in thick coal seam caving coal goaf

Info

Publication number: CN110714761B
Application number: CN201911141342.4A
Authority: CN
Inventors: 王志强; 乔建永; 苏泽华
Original assignee: China University of Mining and Technology Beijing CUMTB
Current assignee: China University of Mining and Technology Beijing CUMTB
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2023-02-21
Anticipated expiration: 2039-11-20
Also published as: CN110714761A

Abstract

The invention relates to the field of coal mining, in particular to a re-mining method for residual coal bodies in a thick coal seam caving coal goaf. The method aims to solve the problems of low caving coal recovery rate, difficult roadway construction of a stope face and the like in the prior art. Determining that a top coal caving stoping face is normally arranged in a hard or extra-thick coal seam according to the prior method, arranging a stoping face in an upper mountain or a main roadway on the side of a goaf, tunneling the stoping face return air roadway to be communicated with an auxiliary return air main roadway, and performing stoping on the stoping face and a stoping face transportation roadway at a certain distance until the working face is communicated with the auxiliary return air upper mountain, thereby completing the recovery of residual coal and coal pillars in the goaf.

Description

Method for re-mining residual coal body in thick coal seam caving coal goaf

Technical Field

The invention relates to the field of coal mining, in particular to a re-mining 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. The top coal caving mining is a method of utilizing a coal mining machine to mine a coal wall with the thickness of 2-3m, utilizing ground pressure to crush top coal and then discharging the top coal from a coal caving port, and has the advantages of high yield and high efficiency. However, in the process of thick coal seam mining, the top coal caving mining method has the defects of low recovery rate, poor coal caving effect and the like, a large amount of coal is left in a goaf, and coal pillars reserved between working faces are difficult to recover, so that a large amount of coal loss is caused.

Due to the continuous mining, resources with good occurrence state become less and less, secondary mining is carried out on the mine, the mining relation can be relieved, and the service life is prolonged. However, when roadway excavation is performed in the goaf, the top plate is extremely broken and easily falls down, which is a main problem in the construction process.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a method for re-mining residual coal bodies in a thick-seam caving coal goaf so as to solve the problems of low recovery rate of caving coal, difficulty in roadway construction of a re-mining working face and the like in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the re-mining method of the residual coal body in the thick coal seam caving coal goaf comprises the following steps:

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 on one side of the goaf, communicating the stope face return air roadway with a return air ascending or large roadway and an auxiliary return air ascending, and tunneling a stope face haulage roadway in a coal column on the other side of the goaf from the haulage ascending or large roadway, communicating the stope face return air roadway with the stope face return air roadway to form a cut hole;

c. during mining, a certain offset distance is kept between a driving working face and a recovery working face of the haulage roadway to form front driving and rear mining until the working face is communicated with an air return upward mountain or a large roadway and an auxiliary air return upward mountain.

In the method for re-mining residual coal bodies in the thick-seam caving coal goaf, the re-mining working 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 step b, the cutting holes of the stope face are arranged along the upper mountain or the main roadway of the mining area in the main roadway protection coal pillar.

In the method for re-mining the residual coal body in the thick-seam caving coal goaf, the distance between the re-mining working face and the haulage roadway driving working face in the step c is greater than the advanced mining influence distance of the working face.

In the method for re-mining the residual coal body in the thick-seam caving coal goaf, the ventilation mode of the re-mining working face in the step c is Z-shaped ventilation.

The re-mining 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) Solves the problem of tense production successor and maintains the production and operation of aging mines. The method can temporarily solve the urgent need of enterprises for no coal mining. The original production system can be utilized to realize the coal discharge with few tunnels and multiple coal outlets, so that the increasingly tense situation of mine excavation relation can be relieved. The method strives for precious time for mine replacement or production transfer, guarantees the life of workers, and is beneficial to social stability.

Drawings

FIG. 1 is a schematic diagram of a re-mining method of residual coal in a thick-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-re-mining working face return airway; 7-stope face haulage roadway; 8-tunneling working face; 9-air intake sign; 10-dirty wind flag;

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

The invention provides a method for re-mining residual coal bodies in a thick-seam caving coal goaf, which comprises the steps of normally arranging a caving coal working face 1 according to the existing method, caving coal caving in the goaf after the re-mining is finished, protecting coal pillars on two sides of the goaf and arranging a re-mining working face in the goaf, wherein the re-mining range of the re-mining working face comprises the top coal lost in the original caving coal goaf and the protecting coal pillars lost on two sides of 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 ascending or large roadway and an auxiliary air return ascending 2, tunneling a re-mining working face transport roadway 7 in the coal pillar on the other side of the goaf from the transport ascending or large roadway, communicating with the re-mining working face air return roadway to form cut holes, and arranging the cut holes in the large roadway protection coal pillar along the mining area ascending or large roadway.

And thirdly, during mining, a certain offset distance is kept between the haulage roadway tunneling working face 8 and the re-mining working face 5, and the offset distance is larger than the advanced mining influence distance of the working face. The maintenance time of the haulage roadway of the stope face is shortened. Until the working face is communicated with the return air upward mountain or the main lane and the auxiliary return air upward mountain. The ventilation mode of the stope face is Z-shaped ventilation. The wind flow traveling route is that the air flow traveling route is a transport ascending or big lane 3 → a transport lane 7 of the stope face → a stope face 5 → a stope face return air lane 6 → an auxiliary return air ascending or big lane 2, so that the wind pressure difference between the air flow traveling route and the stope face return air lane is avoided from forming at two sides of the residual coal in the goaf of the original caving top coal, and the natural ignition probability is reduced.

Claims

1. The method for re-mining the residual coal body in the thick coal seam caving coal goaf is characterized by comprising the following steps of:

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 mining, a certain offset distance is kept between a driving working face and a recovery working face of the haulage roadway to form front driving and rear mining until the working face is communicated with an air return upward mountain or a large roadway and an auxiliary air return upward mountain,

in the step a, the stoping range of the stoping face comprises the lost top coal of the original caving top coal goaf and the lost protective coal pillars on the two sides, in the step c, the distance between the stoping face and the driving face of the haulage roadway is larger than the advanced mining influence distance of the working face, and in the step c, the ventilation mode of the stoping face is Z-shaped ventilation.

2. The method for re-mining the residual coal body in the thick-seam caving coal goaf according to claim 1, wherein in the step b, the re-mining working face cutting holes are arranged along a mine or a main roadway of the mining area in a main roadway protection coal pillar.