【摘要】 冲击矿压(岩爆)造成矿山巷道及开采空间的破坏,主要原因也是由于冲击震源产生的震动波传播扰动而引起的。采用TDS–6微震信号数据采集试验系统,通过地面不同场地介质进行的微震试验,得到沿传播距离各个拾震器位置的能量变化曲线,并对比分析不同场地介质中冲击震动波传播能量衰减指数的差异。试验结果表明,岩土介质中冲击震动能量沿传播距离呈乘幂关系衰减。能量衰减指数η在完整坚硬致密介质中很小,而在松散软弱孔隙介质中明显增大,而且能量初始衰减很快,到一定距离后则变得非常微弱。这些结论为进一步研究巷道围岩冲击震动破坏机制、巷道围岩防冲抗震的强弱强结构控制原理等奠定理论基础。更多还原

【Abstract】 The transmitting and attenuation laws of stress wave in rocks are important and hot research issues in geotechnical engineering and mining engineering.The major reason that roadway or working face is destroyed by rockburst is also the transmitting wave of earthquake tremor.Using TDS–6 seismic experiment instrument,the experiment on the transmitting law of earthquake tremor is carried out for different rocks;and energy attenuation curve is achieved with analyzing the different above-mentioned curves.Experimental results reveal that shock energy attenuates exponentially with the distance from the explosive center.The energy attenuation index η is considerably small in intensified rock and soil media,but much larger in weak or soft media apparently.The energy attenuates quickly in the beginning,and it will disappear after certain distances.These conclusions provide the theoretical basis for studying the failure mechanism of roadway surrounding rock subjected to rockburst and forming the control principle of strong-soft-strong structure for roadway to prevent rockburst.更多还原