边界条件设置及输入地震波特性对边坡动力响应影响分析  

Effect of different boundary conditions and seismic waves on seisimc response of a slope

作　　者：张国栋[1,2] 陈飞[2] 金星[2] 李勇[1,2] 李荣彬[2] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木水电学院,湖北宜昌443002

出　　处：《振动与冲击》2011年第1期102-105,127,共5页Journal of Vibration and Shock

基　　金：三峡库区地质灾害教育部重点实验室开放基金(2008KDZ1 1);湖北省自然科学基金(2007ABA039);湖北省教育厅自然科学研究重点项目(D200713002)

摘　　要：对有限计算域边界处理是边坡动力有限元计算的重要问题之一,利用有限元弹塑性动力分析方法,把边坡动力响应分析中边界条件设置概括为5种情况,输入3条实测地震波,研究边界条件设置和地震波特性对边坡位移响应、加速度响应以及频谱的影响。研究表明设置不同的边界条件及输入不同地震波,边坡动力响应结果有显著差异。研究结果有助于进一步揭示边坡在地震作用下的响应特性,为边坡的动力破坏机理研究和提高边坡稳定性分析评价的可靠性奠定基础。Boundary condition of a limited computing domain is a key problem of dynamie finite element calculation. Using the nonlinear dynamic finite element method, the seismic response behavior of a slope was investigated. The boundary conditions modeled in the dynamic analysis were summed up for five eases. The three actual seismie waves were inputted. The dynamic responses （displacement, acceleraction and frequency spectrum） of the slope were evaluated on the basis of different boundary conditions and seismic waves. It was shown that dynamic responses of the slope are significantly different. The study revealed the seismic response properties of the slope, and laid a foundation for analyzing slope failure mechanisms and improving reliability of slope stability analysis and evaluation.

关 键 词：地震波输入 边界条件 动力响应 有限单元法 

分 类 号：TU443[建筑科学—岩土工程]