关键词: 冲击地压, 定向长钻孔, 水力压裂, 坚硬复合顶板, 超前卸压

Abstract: In view of the fact that the current advanced drilling hydraulic fracturing cutting roof pressure relief method commonly used in coal mine can not deal with the hard composite roof with high thickness well, based on the multi-point drag-type open-hole stage fracturing complete set equipment in coal mine, the technology of weakening and defusing the danger in the fractured zone of the ultra-long drilling hole with hard composite roof is formed. Through the implementation of "high-low" directional long drilling segmented hydraulic fracturing, the basic roof can collapse and contact the gangue in advance, form effective support to the working face roof, and avoid the occurrence of rock burst. In addition, in Ordos mining area, the method of directional long drilling segmented fracturing in underground coal mine is adopted to carry out advanced regional weakening treatment, and the engineering practice proves that the prevention and control effect is remarkable: In the fracturing process, a three-dimensional fracture network can be formed in the rock mass to communicate macro and micro fractures, and the overburden rock can fully collapse, so that it can reach the full mining state faster, and reduce the risk of dynamic load on the working face caused by sudden instability of overburden rock roof after reaching the limit span. It greatly reduces the energy release intensity, periodic pressure intensity and the leading stress peak value in the coal body, and effectively slows down the roadway deformation.