节理岩体对P波传播的影响

Influence of Jointed Rockmass on P Wave Propagation

应力波在节理岩体中的传播规律是十分复杂的,不仅会受到岩石物理力学参数的影响,还会受到节理性质及分布特征的影响。以含平行双节理的岩体作为研究对象,采用数值模拟的方式探讨了平面P波在节理岩体中传播规律。首先,对含平行双节理的岩体进行了分析,探讨了节理刚度、归一化节理间距、节理倾角、节理刚度比对质点振速缩放系数(VSF)在节理前、节理间和节理后分布特征的影响。结果表明:对于节理岩体,节理刚度越大,平面P波的透射性越好,能量衰减的越少;在一定范围内,归一化节理间距越大,能量衰减的越多;节理倾角对不同位置的监测点的影响各不相同;不同刚度比下,对节理2附近的监测点影响较大,其余监测点基本上没有影响。

The propagation law of stress wave in jointed rock mass is very complex,which is not only affected by the physical and mechanical parameters of rock,but also affected by the joint properties and distribution characteristics.Taking the rock mass with parallel double joints as the research object,the propagation law of plane P wave in jointed rock mass was discussed by numerical simulation.Firstly,the rock mass containing parallel double joints was analyzed,and the influence of joint stiffness,equivalent joint spacing,joint inclination angle and joint stiffness ratio(VSF)on the distribution characteristics of particle velocity before,between and after joints was discussed.The results show that the higher the joint stiffness is,the better the plane P wave transmission is and the less the energy attenuation is.Within a certain range,the greater the equivalent joint spacing is,the more the energy attenuation is.The joint inclination has different effects on the monitoring points at different positions.Under different stiffness ratios,the monitoring points near joint 2 have great influence,while the other monitoring points basically have no influence.