地震波在巷道弹塑性围岩中传播规律的数值模拟研究

基于有限元动力分析软件ANSYS/LS-DYNA模拟了地震波在具有初始应力情况下的巷道弹塑性围岩介质中的传播过程，分析了该条件下地震波在巷道周边的传播衰减规律。研究结果表明：随着传播距离的增加，地震波传播呈负指数函数关系衰减；地震波加速度幅值在近源场衰减速度快，远源场衰减减缓；当巷道正前方发生挠动时，随着离巷帮的距离越远，地震波加速度幅值越小；巷道围岩的弹、塑性应力状态也是影响地震波传播过程的一个重要因素，在弹塑性围岩介质中传播时，地震波能量的损耗主要是由于波形的几何扩展和介质的塑性变形引起的。

Numerical simulation on propagation laws of seismic wave in elastoplastic tunnel rock medium

Based on the finite element dynamic analysis software ANSYS/LS DYNA,the propagation process of seismic waves in the elastoplastic tunnel rock under initial stress was simulated,and the propagation and attenuation laws of seismic waves around tunnel were analyzed.The results indicate that:the amplitude attenuates by negative exponential law with seismic wave spreading in the coal and rock;the acceleration amplitude of seismic wave decays rapidly in near field and slowly in far field;when the perturbation is occurred in the dead ahead of tunnel,the further the distance between the point and the tunnel is,the smaller the acceleration of seismic wave is;the elastic and plastic stress state of tunnel rock is also an important factor to affect propagation process of seismic wave.The energy of seismic wave is mainly consumed because of geometric spreading of waveform and plastic deformation of medium.