应力波在节理岩体中的传播特性  

Propagation Characteristics of Stress Waves in Jointed Rock Mass

作　　者：李善伟 刘亚强 贾帅龙 曹泽林 杜鹏 和家兴 LI Shan-wei;LIU Ya-qiang;JIA Shuai-long;CAO Ze-lin;DU Peng;HE Jia-xing(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Tianjin Branch,Tianjin 300202,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092 [2]上海市政工程设计研究总院(集团)有限公司天津分公司,天津300202 [3]河北工程大学土木工程学院,邯郸056038

出　　处：《科学技术与工程》2024年第30期13091-13100,共10页Science Technology and Engineering

基　　金：国家自然科学基金(52308495);河北省自然科学基金(E2022402077)。

摘　　要：为了研究应力波在充填节理岩体中的传播规律,通过理论和数值模拟方法对应力波在充填节理岩体中的传播规律进行了分析。首先,采用时域递归方法推导出应力波在充填节理岩体中的传播方程,并进一步将充填节理简化为位移不连续模型。然后,利用离散元程序(universal distinct element code,UDEC)对应力波在充填节理岩体中的传播进行模拟,对比发现,理论与数值计算结果较为接近。最后,对充填节理间应力波的传播特性进行分析。结果表明:应力波法向入射充填节理时,充填节理厚度与应力波波长相比较小,可以将充填节理简化为位移不连续模型;存在2个临界值将节理间距对能量透反射系数的影响规律分为3个区间,当节理间距足够大时,能量透反射系数趋于稳定;应力波在节理组间产生多次透反射现象,节理岩体中不同位置的振动速度均是由应力波叠加而成。In order to study the propagation law of stress waves in rock mass with filled joint,the propagation law of stress waves in jointed rock mass was analyzed by theoretical and numerical simulation methods.Firstly,the propagation equation of stress wave in joint rock mass was deduced by time domain recursion method,and the filled joint is further simplified as displacement discontinuous model.Subsequently,the stress waves propagation in filled jointed rock mass was simulated by UDEC program,and it is found that the theoretical and numerical results are in good agreement.Finally,the propagation characteristics of stress waves between filled joints were analyzed.The results show that when the stress wave normally incident on the filled joint,compared with the stress wave length,the filled joint thickness is small,and the filled joint can be simplified into a joint model without considering the thickness.The influence of joint space on the energy transmission and reflection coefficient can be divided into three intervals by two critical values,when the joint space is large enough,the energy transmission and reflection coefficients tends to be stable.Between the joint groups,the stress wave will produce multiple transmission and reflection phenomena,and the different positions vibration velocity of the joint rock mass is superimposed by the stress wave.

关 键 词：时域递归法 充填节理 应力波 位移不连续模型 透反射系数 

分 类 号：TU452[建筑科学—岩土工程]