应力波在非线性变形节理处传播规律的颗粒流模拟研究  

Particle Flow Simulation Study on the Propagation Law of Stress Wave at Nonlinear Deformation Joints

作　　者：王卫华[1] 黄瑞新 罗杰 WANG Weihua;HUANG Ruixin;LUO Jie(School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China;Beijing Capital International Airport Co.,Ltd.,Beijing 100621,China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]北京首都国际机场股份有限公司,北京100621

出　　处：《黄金科学技术》2023年第4期580-591,共12页Gold Science and Technology

基　　金：国家重点研发计划项目“高寒及生态脆弱区大型矿山绿色开采技术”(编号:2022YFC2903901)资助。

摘　　要：岩体节理会对岩体中应力波的传播产生显著影响,研究节理岩体中应力波的传播规律对于爆破破岩、抗震与防爆等均具有重要实际意义和理论价值。运用FISH语言对光滑节理模型中的细观节理法向刚度进行修改,建立了具有非线性变形特性的岩石节理颗粒流模型,模拟分析了应力波在非线性变形节理处的传播特性,获得了节理刚度、应力波振幅和应力波频率对透反射系数的影响规律,并从细观角度揭示了应力波与节理相互作用的机理。结果表明:节理刚度对应力波透反射系数会产生较大影响,刚度越大透射系数越大,反射系数则越小。当节理刚度达到某一临界值后,透射系数增长缓慢并趋于稳定值;入射波幅值越大,透射系数越大,反射系数则越小;应力波透射系数随入射波频率的增加而减小,节理表现出高频滤波特性。Rock joints have significant influence on the propagation of stress waves in jointed rock mass.Study on the propagation law of stress waves in jointed rock mass is of great practical significance and theoretical value for rock blasting,earthquake engineering and explosion protection.The code was written by FISH language to modify the normal stiffness of micro-joints in the smooth joint model,and a particle flow model of rock joints with nonlinear deformation characteristics was established.The propagation characteristics of stress waves across single nonlinear deformed joints were analyzed,and the influence laws of joint stiffness,stress wave amplitude and stress wave frequency on the transmission and reflection coefficients were obtained.The interaction mechanism between stress wave and joint was revealed from microscopic perspective.The results show that the joint equivalent stiffness has a great influence on transmission and reflection coefficients of the stress wave.The larger the equivalent stiffness is,the larger the transmission coefficient is,and the smaller the reflection coefficient is.When the joint stiffness reaches a certain critical value,the transmission coefficient increases slowly and tends to a constant value.With the increase of the amplitude of incident wave,the transmission coefficient is increasing and reflection coefficient is decreasing.The stress wave transmission coefficient decreases with the increase of incident wave frequency,and the joint shows high frequency filtering.

关 键 词：非线性变形节理 颗粒流模拟 应力波传播 透反射系数 

分 类 号：TU455[建筑科学—岩土工程]