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针对朝川矿开采二1煤21090工作面,利用超声波技术对工作面底板采动破坏情况进行探查和分析,依据距离工作面不同距离波速随深度的变化,确定底板采动破坏深度。探查结果表明,该工作面底板采动破坏深度集中在20.40~23.36 m,且深部岩层裂隙优先于浅部岩层发育。
According to the mining of No.1 21090 working face in Chachuan Mine, the mining damage of the working face was probed and analyzed by ultrasonic technology. The depth of mining failure of the floor was determined according to the variation of wave velocity with depth at different distances from working face. The exploration results show that the depth of mining failure of the working face is concentrated in the depth of 20.40 ~ 23.36 m, and the fractures in deep rock strata take precedence over the shallow rock strata.