Method for eliminating outburst in advance for hard roof of coal mine in full face roadway

Abstract

The invention relates to a method for eliminating outburst in advance for a hard roof of a coal mine in a full face roadway. The method comprises the following steps: designing drilling parameters andfracturing construction parameters according to information and data which are acquired from preliminary site construction; arranging a directed drill at a start end of a face corresponding to a roadway on one side or two sides, and drilling a plurality of horizontal wells at preset positions of the hard roof at the upper part in a certain aperture angle, wherein a horizontal section is ended atthe edge or the central axis of the face at a certain distance, and the horizontal sections of all the horizontal wells are subjected to open hole completion; arranging equipment required for sectional fracturing construction of the horizontal wells in a proper region in the underground roadway; performing sectional fracturing construction on the open hole horizontal sections of the horizontal wells to enable the hard roof of the whole face to be full of cracks, so as to fulfill the aim of eliminating the outburst in advance for the hard roof of the coal mine in the full face roadway. According to the method, multiple cracks can be overall manufactured on the same horizontal plane of the hard roof to destroy the structure of the roof of the whole face to eliminate the outburst in advance,and the overall effect is outstanding.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and in particular relates to a method for early elimination of outbursts in a roadway on a full working face of a hard roof in a coal mine. Background technique [0002] In coal mining, if there is a hard roof, it will cause serious deformation of the rock mass, severe occurrence of advanced mine pressure, and rock burst and other disasters. The hard roof collapses suddenly when the overhang area is large after the coal seam is mined. Before the 1980s, some coal mines in my country usually used the knife pillar mining method to manage the hard roof. After a certain distance was mined, a certain area of ​​coal pillars were left in the goaf to support the roof. Using this method can basically ensure that the roof does not collapse during the mining of the working face. However, with the continuous expansion of the mining area, the stress of the remaining coal pillars will gradually increa...

AI Technical Summary

Problems solved by technology

[0005] The blasting roof control technology has the following defects: a large amount of pyrotechnics is used, and there are potential safety hazards in the transportation process; a large amount of toxic and harmful gases are generated after use, which seriously threatens the life safety of the workers and increases the probability of workers suffering from occupational diseases; The vibration generated by the roof will damage the support of the working face and the ground

[0006] Although the directional hydraulic fracturing technology in the roadway can eliminate the outburst in advance, it still has the following defects: the footage length is invalid at the predetermined position of the hard roof, and it is necessary to drill inclined wells in the roadway; it is necessary to densely arrange wells on both sides of the roadway working face. High cost; during fracturing construction, a directional grooving process needs to be added before each fracturing, resulting in a prolonged construction period; single well footage is short, which cannot solve the deep problem of the working face, nor can it solve the outburst problem of the entire working face

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