摘要
Abstract
To explore the pressure relief effect of directional long borehole regional fracturing technology on deep mining faces with strong mine pressure,analysis and verification were conducted using methods such as fracturing water pressure curves,transient electromagnetic results,microseismic data,and end load data.The research results show that:Sufficient fracturing pressure can achieve rock-breaking effects,causing the rock mass to continuously generate fractures.Transient e-lectromagnetic testing in the fractured area shows that the resistivity of both high and low rock layers increases,and the re-sistivity contour lines undulate irregularly,indicating that fracturing produces a large number of fractures with highly variable distribution.Compared with non-fractured areas,microseismic events in the fractured working face show a trend of develo-ping from high energy and high frequency to low energy and low frequency,the advanced influential range of mining is re-duced,and the range of advanced stress concentration is narrowed.Comparison of support stress changes indicates that the implementation of regional fracturing effectively reduces the degree of static load concentration on the two sidewalls of road-way in the working face.This technology can effectively reduce the huge impact load caused by roof weighting on the working face during mining and lower the risk of rock burst in the working face.关键词
定向长钻孔/水压曲线/瞬变电磁/微震数据/效果评价Key words
directional long borehole/water pressure curve/transient electromagnetic/microseismic data/effect evaluation分类
矿业与冶金
