Seismic stability of earth slopes with tension crack

作     者：Yundong ZHOU Fei ZHANG Jingquan Wang Yufeng GAO Guangyu DAI 

作者机构：Key Laboratory of Ministry of Education for Geomechanics and Embankment EngineeringHohai UniversityNanjing 210098China Key Laboratory of Concrete and Prestressed Concrete Structure of China Ministry of EducationSoutheast UniversityNanjing 211189China 

出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)

年 卷 期：2019年第13卷第4期

页      面：950-964页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：This study was sponsored by the National Natural Science Foundation of China(Grant Nos.4163063&5187824&and 51578213) the Fundamental Research Funds for the Central Universities(No.2017B00814) the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD) 

主　　题：slope stability tension crack limit equilibrium seismic effect 

摘      要：Cracks at the crest of slopes frequently occur during earthquakes. Such cracks result from limited tension strength of the soil. A tension cut-off in Mohr-Coulomb shear strength can represent this limited strength. Presented is an extension of variational analysis of slope stability with a tension crack considering seismicity. Both translational and rotational failure mechanisms are included in a pseudo-static analysis of slope stability. Developed is a closed-form to assess the seismic stability of slopes with zero tensile strength. The results indicate that the presence of the tension crack has significant effects on the seismic stability of slopes, i.e., leading to small value of the yield acceleration. Considering soil tension strength in seismic slope analysis may lead to overestimation on the stability, as much as 50% for vertical slopes. Imposing tension crack results in transit of the critical failure mode to a straight line from a log-spiral, except for flat slopes with small soil cohesion. Under seismic conditions, large cohesion may increase the depth of crack, moving it closer to the slope.