岩土力学2018，Vol.39Issue(5)：1858-1866,1876,10.DOI:10.16285/j.rsm.2016.1347
覆盖层上土石坝非线性动力响应分析的地震波动输入方法
Seismic wave input method for nonlinear dynamic analysis of earth dam built on overburden
摘要
Abstract
Since many earth dams were built and are to be built on overburden,it is essential to describe the dynamic interaction behaviour between earth dams and the overburden reasonably for the seismic safety evaluation of dams.The seismic wave input method is based on the equivalent load and artificial boundary.This method can well reflect the dynamic soil-structure interaction,and thus it has been widely used in dam engineering and underground engineering.Moreover,this method is easy to be realised in the homogeneous linear elastic foundation but difficult in the overburden foundation with the soil nonlinearity.In this study,a simplified finite element model for the free field is established according to the deformation mode of the free field at the lateral boundary.This simplified model can conveniently and precisely obtain the nonlinear dynamic response of homogeneous or layered overburden under the action of normal incidence of the multi-direction earthquake.Then,a seismic wave input method is developed for nonlinear dynamic analysis of earth dams built on overburden.Besides,the established method is combined with the dynamic real-time nonlinear artificial boundary of ground material parameters.The numerical examples show that this method can reduce the amount of calculation grid remarkably,meanwhile can reflect the effect of overburden on the spectrum of earthquake response with high accuracy.关键词
土石坝/覆盖层/地震波动输入/自由场/非线性人工边界Key words
earth dam/overburden/seismic wave input/free field/nonlinear artificial boundary分类
建筑与水利引用本文复制引用
余翔,孔宪京,邹德高,周晨光..覆盖层上土石坝非线性动力响应分析的地震波动输入方法[J].岩土力学,2018,39(5):1858-1866,1876,10.基金项目
国家重点研发计划资助(No.2017YFC0404904) （No.2017YFC0404904）
国家自然科学基金项目(No.51779034,No.51678113) （No.51779034,No.51678113）
中央高校基本科研业务费资助(No.DUT17ZD219) （No.DUT17ZD219）
水利部土石坝破坏机理与防控技术重点实验室开放研究基金(No.YK916005). This work was supported by the National Key R.& D.Program of China (2017YFC0404904),the National Natural Science Foundation of China (51779034,51678113),the Fundamental Research Funds for the Central Universities (DUT17ZD219) and the Open Foundation of Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources (YK916005). （No.YK916005）
