A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide

作     者：Chun Feng Shihai Li Xiaoyu Liu Yanan Zhang 

作者机构：Institute of Mechanics Chinese Academy of Sciences 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2014年第6卷第1期

页      面：26-35页

核心收录：

学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the National Basic Research Program of the Ministry of Science and Technology of China (Grant No. 2010CB731506) the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2012BAK10B01) the Youth Science Fund of National Natural Science Foundation of China (Grant No. 11302230) 

主　　题：Continuum-based discrete element method (CDEM) Contact detection method Semi-spring Semi-edge Landslide 

摘      要：Continuum-based discrete element method(CDEM)is an explicit numerical method used for simulation of progressive failure of geological *** improve the efficiency of contact detection and simplify the calculation steps for contact forces,semi-spring and semi-edge are introduced in *** is derived from block vertex,and formed by indenting the block vertex into each face(24semisprings for a hexahedral element).The formation process of semi-edge is the same as that of semi-spring(24semi-edges for a hexahedral element).Based on the semi-springs and semi-edges,a new type of combined contact model is *** to this model,six contact types could be reduced to two,*** semi-spring target face contact and semi-edge target edge *** the combined model,the contact force could be calculated directly(the information of contact type is not necessary),and the failure judgment could be executed in a straightforward way(each semi-spring and semi-edge own their characteristic areas).The algorithm has been successfully programmed in C++*** simple numerical cases are presented to show the validity and accuracy of this ***,the failure mode,sliding distance and critical friction angle of Jiweishan landslide are studied with the combined model.