A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide
Continuum-based discrete element method (CDEM) is an explicit numerical method used for simulation of progressive failure of geological body. To improve the efficiency of contact detection and simplify the calculation steps for contact forces, semi-spring and semi-edge are introduced in calculation....
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doaj-d79f78e4153c430aaf1434cb2adcf6072020-11-24T23:56:33ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552014-02-0161263510.1016/j.jrmge.2013.12.001A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslideChun FengShihai LiXiaoyu LiuYanan ZhangContinuum-based discrete element method (CDEM) is an explicit numerical method used for simulation of progressive failure of geological body. To improve the efficiency of contact detection and simplify the calculation steps for contact forces, semi-spring and semi-edge are introduced in calculation. Semi-spring is derived from block vertex, and formed by indenting the block vertex into each face (24 semi-springs for a hexahedral element). The formation process of semi-edge is the same as that of semi-spring (24 semi-edges for a hexahedral element). Based on the semi-springs and semi-edges, a new type of combined contact model is presented. According to this model, six contact types could be reduced to two, i.e. the semi-spring target face contact and semi-edge target edge contact. By 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++ program. Some simple numerical cases are presented to show the validity and accuracy of this model. Finally, the failure mode, sliding distance and critical friction angle of Jiweishan landslide are studied with the combined model.http://www.sciencedirect.com/science/article/pii/S1674775513001170Continuum-based discrete element method (CDEM)Contact detection methodSemi-springSemi-edgeLandslide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chun Feng Shihai Li Xiaoyu Liu Yanan Zhang |
spellingShingle |
Chun Feng Shihai Li Xiaoyu Liu Yanan Zhang A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide Journal of Rock Mechanics and Geotechnical Engineering Continuum-based discrete element method (CDEM) Contact detection method Semi-spring Semi-edge Landslide |
author_facet |
Chun Feng Shihai Li Xiaoyu Liu Yanan Zhang |
author_sort |
Chun Feng |
title |
A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide |
title_short |
A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide |
title_full |
A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide |
title_fullStr |
A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide |
title_full_unstemmed |
A semi-spring and semi-edge combined contact model in CDEM and its application to analysis of Jiweishan landslide |
title_sort |
semi-spring and semi-edge combined contact model in cdem and its application to analysis of jiweishan landslide |
publisher |
Elsevier |
series |
Journal of Rock Mechanics and Geotechnical Engineering |
issn |
1674-7755 |
publishDate |
2014-02-01 |
description |
Continuum-based discrete element method (CDEM) is an explicit numerical method used for simulation of progressive failure of geological body. To improve the efficiency of contact detection and simplify the calculation steps for contact forces, semi-spring and semi-edge are introduced in calculation. Semi-spring is derived from block vertex, and formed by indenting the block vertex into each face (24 semi-springs for a hexahedral element). The formation process of semi-edge is the same as that of semi-spring (24 semi-edges for a hexahedral element). Based on the semi-springs and semi-edges, a new type of combined contact model is presented. According to this model, six contact types could be reduced to two, i.e. the semi-spring target face contact and semi-edge target edge contact. By 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++ program. Some simple numerical cases are presented to show the validity and accuracy of this model. Finally, the failure mode, sliding distance and critical friction angle of Jiweishan landslide are studied with the combined model. |
topic |
Continuum-based discrete element method (CDEM) Contact detection method Semi-spring Semi-edge Landslide |
url |
http://www.sciencedirect.com/science/article/pii/S1674775513001170 |
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