土—基础相互作用的辐射阻尼  

Radiation damping of soil-foundation interaction systems

作　　者：杨先健[1] 

机构地区：[1]国家机械工业局第四设计研究院,洛阳471039

出　　处：《岩土工程学报》2000年第4期416-420,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家机械工业局科研课题!(No.机行设97-013)

摘　　要：基于土体中应力波理论 ,导得土—基础在影响深度范围内土的辐射阻尼 ,提出了类比剪切群速的半空间理论阻尼比公式。其结果比经典半空间理论阻尼更符合工程实践。并由波的散射原理 ,分析了土层差异对半空间阻尼的影响效应 ,提出了工程实用计算方法。依波动理论 ,提出了基础振动的影响深度确定公式。Based on the theory of stress wave in soil,the radiation damping which is caused in soil of dynamic soil-foundation within the range of the depth of influence,and the fundamental formula of damping ratio of the elastic halfspace by the analog group shear wave velocity are presented in this paper.The analyzed results correspond better with the engineering practice than that of the classical theory of halfspace.The effect of the differential strata in halfspace on the damping is analyzed by theory of wave scattering,and the practical calculation method is presented.On the basis of the theory of wave,the formula of depth affected by the foundation vibration are involved in this study.Finally,taking some engineering project as examples,the results of theoretic calculation and the field observation have been found to be in good agreement.

关 键 词：土--基础 辐射阻尼 类比剪切群速 相互作用 

分 类 号：TU435[建筑科学—岩土工程]