钻孔冲击实验与冲击地压应力判据的探讨

概述了国内外钻孔冲击实验的情况,介绍了钻孔冲击实验的方法．对3个矿的钻孔冲击实验进行了分析,结果表明存在一个临界压力,可作为发生冲击地压应力条件的判据;随着施加在煤样上的载荷增加,钻孔冲击次数显著增多,冲击强度增大．用RFPA软件对钻孔冲击进行了数值模拟,验证了钻孔冲击实验得出的临界压力,并研究了钻孔冲击前、后的应力降及声发射等特征．对钻孔冲击的原理进行了探讨．现场冲击地压显现的应力条件符合钻孔冲击实验得出的判据．

Discussion of borehole burst experiment and the stress criterion of rock burst

The world borehole burst experiment is introduced.By analyzing the borehole burst experiment of three mines, the critical pressure is put forward, which can be used as the stress condition of occurring rock burst. Along with the load that acts on the coal sample increasing, the burst times obviously rise and the burst intension also rise.The software RFPA is used to simulate the borehole burst, validate critical pressure,and research the stress drop and acoustic emission before and after occurring the burst in the borehole.The principle of borehole burst is also discussed, and the stress condition of rock burst emergence accords with stress criterion gotten from borehole burst experiment.