弱充填结构面厚度对岩体动态力学行为特征的影响研究  

Influence of weakly filled structural surface thickness on the dynamic mechanical behavior of rock mass

作　　者：王启睿 石晓燕 郭鹏 宋二祥[2] 杨立云[3] WANG Qirui;SHI Xiaoyan;GUO Peng;SONG Erxiang;YANG Liyun(Defense Engineering Institute,AMS,PLA,Luoyang 471023,China;Tsinghua University,Beijing 100084,China;China University of Mining and Technology,Beijing 100083,China)

机构地区：[1]军事科学院国防工程研究院,河南洛阳471023 [2]清华大学,北京100084 [3]中国矿业大学(北京),北京100083

出　　处：《防护工程》2024年第1期1-7,共7页Protective Engineering

摘　　要：通过开展SHPB冲击试验和数值模拟,研究冲击作用下含弱充填结构面岩体的损伤特征和破坏过程,以及结构面厚度变化对岩体动态强度、应力波传播和能量分布演化的影响规律。结果表明:冲击作用下含充填结构面岩体的动态强度随结构面厚度的增大而减小;弱充填结构面厚度显著影响岩体破坏特征与过程,表现为起裂前、起裂、扩展和贯通破坏4个阶段的不同变化趋势,且结构面充填体与岩体的破坏特征表现不同;随着结构面厚度增大,岩体中应力波反射系数先增后减,透射系数减小,且透射波携带能量也随之降低。Through conducting SHPB impact tests and numerical simulations,this study investigates the damage characteristics and failure processes of rock masses with weakly filled structural surfaces under impact loading,as well as the influence of changes in structural surface thickness on the dynamic strength,stress wave propagation,and evolution of energy distribution in the rock mass.The results indicate that the dynamic strength of rock masses with filled structural surfaces decreases with an increase in structural surface thickness under impact loading.The thickness of weakly filled structural surfaces significantly affects the characteristics and processes of rock mass failure,exhibiting different trends in four stages:pre-cracking,cracking,propagation,and perforation.Moreover,the damage characteristics of the filled structural surface and the rock mass show distinct variations.As the structural surface thickness increases,the reflection coefficient of stress waves in the rock mass first increases and then decreases,the transmission coefficient decreases,and the energy carried by transmitted waves also decreases.

关 键 词：岩体结构面 应力波 破坏特征 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]