基于MatDEM的岩石应力波传播与衰减特性敏感性分析  

Sensitivity Analysis of Rock Stress Wave Propagation and Attenuation Characteristics Based on MatDEM

作　　者：范观盛 黄靥欢 刘春[1,2] 乐天呈 FAN Guansheng;HUANG Yehuan;LIU Chun;LE Tiancheng(School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Nanjing University(Suzhou)High-tech Institute,Suzhou 215123,China)

机构地区：[1]南京大学地球科学与工程学院,南京210023 [2]南京大学(苏州)高新技术研究院,苏州215123

出　　处：《高校地质学报》2023年第3期479-486,共8页Geological Journal of China Universities

基　　金：国家自然科学基金项目(41761134089,41977218);江苏省“六大人才高峰”高层次人才(RJFW-003)联合资助。

摘　　要：应力波的研究是岩石动力作用中的关键性问题。基于离散元法,文章对岩石样品开展数值模拟试验,以探究应力波传播和衰减的影响因素及规律。其中重点分析了岩石数值试样的单元半径、阻尼系数,以及入射波频率、振幅对应力波传播产生的影响,并结合真实试验结果进行对比分析。研究结果表明:离散元法能有效的模拟动力作用过程,数值岩样中应力波的传播变化规律与前人研究一致。岩样单元半径增大,导致岩样的不均匀性增加,散射衰减增强;阻尼系数越大,振幅在相同距离处衰减程度越大;岩样中入射波频率降低,波的传播趋势从对数衰减向线性衰减形式发展;加载波的振幅越大,应力波由于散射作用衰减程度越大,在相同传播距离的衰减率保持一定。The study of stress waves is a key issue in the dynamic action of rocks.Based on the discrete element method,this paper carries out numerical simulation tests on rock samples to explore the influence factors and laws of stress wave propagation and attenuation.The analysis focuses on the influence of the element radius,damping coefficient,incident wave frequency and amplitude on the stress wave propagation of the rock numerical sample,compares and analyzes the real test results.The research results show that the discrete element method can effectively simulate the dynamic process,and the variation law of the stress wave propagation in the numerical rock sample is consistent with previous studies.The increase in the radius of the rock sample unit will increase the unevenness of the rock sample and increase the scattering attenuation;the larger the damping coefficient,the greater the attenuation of the amplitude at the same distance;the frequency of the incident wave in the rock sample decreases,the wave propagation trend develops from logarithmic attenuation to linear attenuation;the greater the amplitude of the loading wave,the greater the attenuation of the stress wave due to scattering,and the attenuation rate at the same propagation distance remains constant.

关 键 词：离散元法 MatDEM 应力波 衰减 波速 

分 类 号：P642[天文地球—工程地质学]