Method for controlling integral caving of roof through deep-hole segmented blasting kerf

Abstract

The invention discloses a method for controlling integral caving of a roof through deep-hole segmented blasting kerf, belongs to the technical field of blasting kerfs, can solve the problem of the coal seam roof suspension without caving. According to the technical scheme provided by the method, and the problem of strong strata pressure behavior caused by the coal seam roof suspension without caving in coal mining is solved. Deep hole blasting is conducted on a main roof stratum so that the roof can be prevented from caving immediately after blasting, the main roof stratum in a blasting section after blasting can form a pre-crack weak face with the inclination angle the same as the spontaneous collapse angle of the stratum along a drilling arrangement line, the integrity of a main roof stratum plate structure is cut off, the roof strata directionally caves along the pre-crack weak face under the action of gravity, so that the concentrated stress in front of a mining roadway and a coalwall caused by large-area roof suspension of the roof can be effectively reduced, the stress environment of the roadway is improved, and meanwhile, timely caving of the roof behind the working face avoids the situations of goaf air leakage, gas gathering and residual coal spontaneous combustion.

Description

Technical field[0001]The invention belongs to the technical field of blasting and cutting seams, and specifically relates to a roof cantilever structure next to a coal mine roadway, a roof end roof of a working face, a roof of a goaf at the initial mining stage, and a roof of a final mining support withdrawal channel hang without falling, causing the mining pressure of the working face to appear Strong deep hole segmented blasting and cutting seams to control the overall collapse of the roof.Background technique[0002]In the process of coal mining, there is a phenomenon that the roof is not easy to collapse with the mining. As the working face advances, a large area of ​​the roof behind the goaf of the working face will be caused to increase the concentrated stress on the mining roadway and the front of the coal wall. There is serious air leakage in the goaf and potential safety hazards such as gas accumulation and spontaneous combustion of coal left in the goaf. When the suspended r...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the roof of the coal seam hangs and does not fall, to ensure that the roof of the coal seam can collapse in time with the mining, thereby reducing the stress concentration phenomenon of the coal wall of the working face and the roadway caused by the overhanging roof area, so as to effectively control the surrounding area of ​​the roadway. The deformation of the rock can be adjusted to achieve the effect of ensuring the stability of the surrounding rock of the roadway, and a method for controlling the overall collapse of the roof by slits in deep hole segmental blasting is provided.

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