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Gob-side entry driving surrounding rock control method using remaining small pillars

A control method and technology for small coal pillars, which are used in earth-moving drilling, mining equipment, blasting, etc., to achieve the effect of reducing labor intensity of workers, reducing the number of constructions and the amount of explosives

Inactive Publication Date: 2015-04-22
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to provide a method for controlling the surrounding rock of gob-side excavation with small coal pillars, which reduces the stress of the surrounding rock of the roadway, makes it easier to maintain small coal pillars The technical problems of large deformation of roadway surrounding rock and difficult maintenance during roadway use during roadway excavation

Method used

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  • Gob-side entry driving surrounding rock control method using remaining small pillars
  • Gob-side entry driving surrounding rock control method using remaining small pillars
  • Gob-side entry driving surrounding rock control method using remaining small pillars

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Such as Figure 1-Figure 5 As shown together, the No. 15 coal seam is mined in the fully mechanized mining face of a certain mine, and the coal seam mining height is 26m. The immediate roof is carbonaceous mudstone, with an average thickness of 4.5m; the basic roof is medium- and fine-grained sandstone, with an average thickness of 6.8m, the sandstone is dense and hard, with a tensile strength of 8.2MPa, and the load of the basic roof is 202.3kN / m 2 . The implementation steps are as follows:

[0036] (1) First calculate the hole group spacing a:

[0037] a = h σ t 3 · n · q = 6.8 × ...

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Abstract

The invention discloses a gob-side entry driving surrounding rock control method using remaining small pillars. The method includes: distributing blast holes of different angles and depths in a working face conveying chute during extraction on an upper region working face, preforming a weak face in a certain area of a basic roof to damage completeness of a basic roof rock stratum by deep hole presplitting, and allowing a suspension arch of the basic roof to break at predetermined positions under the action of roof pressure after extraction of the working face. Therefore, the length of the hanging arch of the lateral basic roof of a gob is shortened, gob lateral abutment pressure is reduced, roadway pressure is relieved during gob-side entry driving in a lower region using remaining small pillars, and maintenance of a roadway is facilitated.

Description

technical field [0001] The invention relates to the technical field of roadway surrounding rock control, in particular to a method for controlling roadway surrounding rock with small coal pillars. Background technique [0002] There are two ways to control the surrounding rock of the roadway in the mining area: reducing the stress of the surrounding rock and increasing the support strength. In terms of reducing the stress of the surrounding rock, there are currently two main methods at home and abroad: one is to protect the roadway without coal pillars, and the roadway is arranged in the low-stress area at the edge of the goaf to achieve the purpose of reducing the stress of the surrounding rock of the roadway and at the same time improve The resource recovery rate; the other is to leave wide coal pillars, arrange the roadway in the original rock stress area, and avoid the side high bearing pressure area of ​​the goaf. Because the width of the coal pillar is large, the waste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F17/00F42D3/04
Inventor 苏海张百胜修成智宁剑刘海滨姜精鹏杨锐明李安洪郭志林张玉东刘臻保李亚鹏
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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