【摘要】 以工作面爆破掘进时激发的震动波为研究对象,对爆破震动波在煤岩体中的传播过程进行了理论分析,提出了基于爆破震动波传播特性的煤岩体稳定性评估方法。现场测试并分析了爆破震动波中P波与S波传播时差、能量以及波形等特性。结果表明:炮孔数和爆破药量对P波和S波能量均有不同程度的影响;P波波形变化不大,S波呈现明显的3个阶段,各阶段的能量分布可以反映煤岩体结构的变化情况;纵波与横波走时差值的变动幅度可以较好地表征工作面附近煤岩体结构的变化程度。更多还原

【Abstract】 Taking the vibration wave motivated by blasting excavation as the research object,we analyzed theoretically the transmission process of the motivated vibration wave in the coal- rock mass,and proposed the coal- rock mass stability evaluation method based on this. The transmission time lag between P wave and S wave in the vibration wave as well as the signal energy and the waveform were analyzed. Results show that either the holes number and the charge quantity used for blasting effects the energy of P wave or S wave differently. The waveform of P wave almost shows no change,but the S wave presents 3stages obviously,while the energy distribution of each stage can reflect the transformation of coal- rock structure. The time difference of the wave travels from P wave to S wave can preferably represent the stability of the surrounding coal- rock structure.更多还原