Method for determining reasonable roof cutting position of deep gob-side entry retaining

Abstract

The invention discloses a method for determining a reasonable roof cutting position of a deep gob-side entry retaining. The method for determining the reasonable roof cutting position of the deep gob-side entry retaining comprises the following steps that monitoring points are arranged in a reserved roadway in front of a coal mining working face, arranging a plurality of pressure sensors on the side of the reserved roadway of a gob according to a certain distance, data is acquired to obtain a stress distribution rule of the gob close to a roof of the reserved roadway, a reasonable roof cuttingposition is determined, and anchor cables are arranged at the position, close to a reserved roadway roof, of the gob. According to the method for determining the reasonable roof cutting position of the deep gob-side entry retaining, the safety of gob-side entry retaining supporting can be improved, the overburden strata effect of the gob-side entry retaining can be exerted to the maximum extent through the synergistic effect of forming open-off cut in the stress rising area and arranging anchor cables on the gob-side of the reserved roadway, stress of a roadside supporting body is reduced, deformation and damage of surrounding rocks are effectively controlled, the cost is reduced, and safe and efficient production of coal is promoted.

Description

technical field [0001] The invention relates to the technical problem of working face mining in the field of mining engineering, in particular to a method for determining a reasonable top-cut position of a deep gob-side entry retaining. Background technique [0002] Gob-side entry retaining means that the re-support along the groove of the previous section is reserved for the next section. With the development of coal mining technology, in order to improve the coal recovery rate, most mines are now the first to use coal-free mining. , which not only eases the mining relationship, but also prolongs the life of the mine. Affected by the movement law of the overlying rock in the upper part of the stope, there are stress-reduced areas and stress-increased areas in the surrounding rock of gob-side entry retaining. Support practice is often blind. At present, most roadways still use roadside support with free fall and arbitrary roof cutting, which cannot adapt to the stability o...

AI Technical Summary

Problems solved by technology

Affected by the overlying rock movement law in the upper part of the stope, there are stress-reduced areas and stress-increased areas in the surrounding rock of gob-side entry retaining. Often blindness is greater in support practice

At present, most roadways still adopt the roadside support of free fall and arbitrary roof cutting, which cannot adapt to the stability of the surrounding rock structure of the gob-side retaining roadway, resulting in frequent failure and instability of the roadway and wasting a lot of manpower and material resources

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