岩体中应力波幅值随时空衰减的关系  

A study of time-and spatial-attenuation of stress wave amplitude in rock mass

作　　者：王观石[1,2] 李长洪[2] 胡世丽[1] 冯春[3] 李世海[3] 

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000 [2]北京科技大学土木与环境工程学院,北京100083 [3]中国科学院力学研究所,北京100080

出　　处：《岩土力学》2010年第11期3487-3492,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金重点资助项目(No10632100)

摘　　要：把岩石抽象为Kelvin-Voigt黏弹性体,应用复数理论建立了应力波在岩石中传播时的振动频率和波动频率的关系,在此基础上,研究了岩石和含有一组平行结构面的岩体中应力波幅值随时间和随空间衰减的关系。研究表明,应力波在岩石的传播过程中,频率是影响应力波幅值衰减的的主要因素;应力波在含有1组平行结构面岩体的传播过程中,由于结构面的存在,影响了应力波能量的传播,其幅值随时空衰减系数主要由结构面间距及其反射系数决定,结构面间距减小和反射系数增加,幅值随传播距离的衰减系数增加和随时间的衰减系数减小,而结构面的黏性系数增加,幅值随传播距离的衰减系数增加,但随时间的衰减系数变化很小。上述结论对岩体结构探测具有重要的指导意义。The relation between wave frequency and vibration frequency in Kelvin-Voigt viscoelastic medium was studied by applying the plural theory.The time-and spatial-attenuation of wave amplitude was studied in rock and rock mass with a series of parallel interfaces.The study indicated that the attenuation of stress wave amplitude was mainly decided by vibration frequency of stress wave.Stress wave energy was influenced by interface in rock mass with a series of parallel interfaces.And the time-and spatial-attenuation of stress wave amplitude is decided by distance and reflection coefficient of interface.The decrease of distance of interfaces and the increase of reflection coefficient resulted in increase of spatial-attenuation of rock mass and decrease of time-attenuation,while increase of viscosity coefficient led to the increase of spatial-attenuation and almost the same time-attenuation.This study result played an important role in detecting rock mass structure.

关 键 词：黏弹性体 应力波 衰减系数 应力波探测 

分 类 号：TU452[建筑科学—岩土工程]