Gob-side entry retaining adjoining rock stabilizing method based on lateral rock formation pre-splitting control

Abstract

The invention provides a gob-side entry retaining adjoining rock stabilizing method based on lateral rock formation pre-splitting control. The stabilizing method is used for pre-splitting an upper roof above the gob-side entry retaining. The method comprises the steps as follows: constructing a drill site in a roadway stoping lateral coal wall; stoping a lateral top plate in the drill site; constructing two groups of six advanced pre-splitting blasting holes which take the shape of a small horizontal rotational angle in the trending direction of the roadway; loading the explosive for blasting in the position which is 10 to 40 meters to an advanced working surface. According the method provided by the invention, a top cover rock formation can be pre-split, the fracture of the top cover rock formation in an assigned position outside a wall body is guaranteed, and the contact of the turning submerged upper roof to the gob-side entry retaining adjoining rock is separated, so that the bearing pressure of the gob-side entry retaining adjoining rock is reduced, and the action time of the mining-induced stress is shortened; the method has the effects of simple operation, high efficiency of construction and fast speed.

Description

technical field [0001] The invention relates to a method for treating surrounding rocks of gob-side entry retention in coal mines, in particular to a method for controlling a fully pressure-relieving roof of gob-side entry retention. Background technique [0002] Gob-side entry retaining technology is a major reform in coal mining, and its technical advantages and economic benefits are very significant. So far, my country has made a lot of achievements in the research on surrounding rock control theory and technology of gob-side entry retaining, and the technology of gob-side entry retaining in coal mining face with better conditions has been gradually perfected. However, with the increasingly complex mining conditions, the difficulty in controlling the surrounding rock of gob-side entry retaining becomes prominent. The surrounding rock pressure is too large, the roadway is deformed and even unstable and destroyed, resulting in the failure of entry retaining, which seriously...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of deformation control of the surrounding rock of the gob-side entry retaining, the present invention proposes a roof control method that promotes the full pressure relief of the gob-side entry retaining on the basis of analyzing the structural characteristics of the surrounding rock of the gob-side entry retaining. The roadway is drilled in advance at a small horizontal angle and pre-split by blasting to fully loosen the old top rock formation outside the wall, change the fracture form of the old top 10, and make it break outside the wall to form block A'17-block B For the structure of '18-block C'19, since the breaking position of block B'18 and block A'17 is outside the wall, the old top rock block that has turned and sunk is completely separated from the gob-side retaining overlying The connection of rock formations fundamentally relieves the supporting pressure of the surrounding rock of the gob-side entry retaining, optimizes the stress field in the entry retaining area, and promotes the stability of the rotation and deformation process of the old top rock block as soon as possible, shortens its action time on the surrounding rock of the entry retaining, and achieves control Gob-along retaining deformation purpose

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