振动波作用下饱和土-基础动力相互作用机理研究

项目名称： 振动波作用下饱和土-基础动力相互作用机理研究

项目编号： No.51208383

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 王鹏

作者单位： 温州大学

项目金额： 25万元

中文摘要： 针对动荷载引起的周边环境振动问题，本项目拟通过现场实测、理论解析、有限元模拟和模型试验相结合的方法对振动波作用下饱和土-基础动力相互作用问题进行研究。首先通过实测获得不同动荷载形式周边土体的位移、速度、加速度时程曲线，结合Biot波动方程确定能够反映实际动载形式影响的振动波波场控制参数；根据波场控制参数建立输入波场模型，分析基础对振动波的散射规律；考虑饱和土体的流-固耦合作用，分别建立振动波作用下饱和土-基础解析及有限元模型，研究振动波波场、饱和土体特性和基础参数等因素对系统动力特性的影响规律；进行室内模型试验，将试验数据与解析及有限元结果进行对比, 分析造成结果差异的原因，完善分析模型。本项目的实施可进一步加深对饱和土中振动波传播与散射规律的认识，揭示振动波作用下饱和土-基础动力相互作用机理，并为饱和土中动力基础的设计及环境振动的控制等工程提供更符合实际的分析方法和设计依据。

中文关键词： 饱和地基；基础；动力响应；有限元；多次透射人工边界

英文摘要： Based on various research methods, the dynamic interaction between saturated soil and foundation excited by seismic waves is studied for the control of environmental vibration caused by dynamic loads in this research project. The displacement, velocity and acceleration time-history curves of the soil around the dynamic loads are obtained by field measurement. And combining with the Biot's dynamic poroelastic theory, characteristic parameters of seismic wave fields reflecting the influence of the dynamic loads are determined. Then, based on these characteristic parameters, the input wave fields are established in order to analyze the scattering of seismic waves caused by the existence of the foundation. Considering the fluid-solid coupling interaction of the soil, analysis model and finite element model describing the dynamic interaction between saturated soil and foundation excited by seismic waves are established respectively. The influences of characteristics of seismic waves, soil and foundation on the dynamic response of the whole system are investigated. The laboratory model test is introduced for the comparative analysis with the results of the analysis model and finite element model. This project will facilitate further understanding on the law of propagation and scattering phenomenon of seismic waves in

英文关键词： Saturated soil；Foundation；Dynamic response；Finite element；the multi-transmitting formula