A pressure relief method for bottom coal in fully mechanized caving mining in steeply inclined coal seams

Abstract

The invention discloses a pressure relief method for fully-mechanized top-coal caving mining of steeply inclined coal seams. The pressure relief method for the fully-mechanized top-coal caving miningof the steeply inclined coal seams comprises the steps that the combination of roadway pressure relief blasting, deep hole blasting pressure relief of a pressure relief roadway and ultra-long hole blasting pressure relief of a coal body in a floor concentrated roadway is adopted, wherein the roadway pressure relief blasting performs blasting pressure relief on the lower slope angle of the side, close to the coal body of a working face, of a mining roadway, and then performs monitoring; if the index is within a normal range, the pressure relief work is completed; if the index is beyond the normal range, according to the actual situation of the working face, deep hole blasting pressure relief of the pressure relief roadway and ultra-long hole blasting pressure relief of the coal body in thefloor concentrated roadway are carried out; according to the deep hole blasting of the pressure relief roadway, blasting pressure relief is further carried out on a coal body stress concentration areaby forming coal body deep hole blasting holes in a bottom coal pressure relief roadway to fully crush the coal body; and according to the ultra-long hole blasting pressure relief of the coal body inthe floor concentrated roadway, coal body ultra-long blasting holes are formed in a bottom plate and a bottom coal area in the concentrated roadway through an original bottom plate concentrated roadway so as to reduce stress concentration and impact hazard degree of bottom coal.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock burst, in particular to a pressure relief method for bottom coal in fully mechanized caving mining of steeply inclined coal seams. Background technique [0002] Shock mine pressure is an explosive dynamic disaster in mines caused by the instantaneous and violent release of a large amount of elastic deformation accumulated in coal and rock under the action of high stress. High-efficiency production has caused a great impact. Both the field and theory show that the retention of bottom coal in the working face is one of the main reasons for rock burst. Steeply inclined coal seams account for a certain proportion of the proven reserves of coal. Due to the particularity of their occurrence, the top-down horizontal segmented fully mechanized top-coal caving mining technology is usually adopted, which makes it inevitable to face a considerable thickness during the mining process of the work...

AI Technical Summary

Problems solved by technology

At present, there are domestic plans for the pressure relief of the bottom coal in the mining of steeply inclined coal seams to prevent rock bursts, either because of a single method, or because the parameters adopted are unreasonable, and cannot solve the problem of excessive clamping stress of the bottom coal in the process of horizontal segmental mining of steeply inclined coal seams. High problem, ultimately can not effectively reduce the impact risk of clamping coal

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