Nested Newmark model to estimate permanent displacement of seismic slopes with tensile strength cut-off

作     者：ZHOU Zheng ZHANG Fei GAO Yu-feng SHU Shuang 周政;张飞;高玉峰;舒爽

作者机构：Key Laboratory of Ministry of Education for Geomechanics and Embankment EngineeringHohai University 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2019年第26卷第7期

页      面：1830-1839页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Projects(41630638 51878248)supported by the National Natural Science Foundation of China 

主　　题：slopes limit analysis earthquakes permanent displacement Newmark tensile strength 

摘      要：Nested Newmark model(NNM) is a conceptual framework to assessing post-earthquake movements including dispersed shear movements. The original NNM omits that the tensile stresses would be encountered in slopes induced by earthquakes. The purpose of this study is to introduce the tensile strength cut-off and the relevant failure mechanism into NNM and conduct the limit analysis to determine the seismic displacement. Parametric studies are carried out to further investigate the influence of the tensile strength and input ground motions on permanent displacement. Neglecting the tensile strength can underestimate the permanent displacements of slopes. As the peak acceleration increases, the underestimation becomes more significant. With the reduction of tensile strength, much larger deformation occurs next to the slope crest. Although the present results are limited to an example, the method is of value in practice to predict the post-earthquake profile of slope.