无厚度界面单元边坡浅基础极限承载力上限值的数值分析

›› 2007, Vol. 28 ›› Issue (S1): 267-272.

无厚度界面单元边坡浅基础极限承载力上限值的数值分析

李煜舲

台湾中华大学土木与工程信息学系，台湾新竹 30067

收稿日期:2007-05-31 出版日期:2007-10-25 发布日期:2014-03-28
作者简介:李煜舲，男，1959年生，副教授兼图书馆馆长，法国国立桥梁与道路工程学院土木工程博士，主要从事隧道工程、岩石力学与工程、数值分析方面的研究

Numerical analysis of the upper bound limit analysis of shallow foundation on slope by using zero-thickness interface element approach

LI Yu-lin

Department of Civil Engineering and Engineering Informatics, Chung-Hua University, Hsin-Chu, Taiwan 30067, China

Received:2007-05-31 Online:2007-10-25 Published:2014-03-28

摘要/Abstract

摘要： 采用研发的有限单元分析程序，并同时考虑以库仑摩擦界面为组成模式的多段式无厚度界面单元，藉以探讨边坡坡角与坡缘距离对边坡坡顶浅基础极限承载力的影响，并应用于不同几何破坏机制条件，计算边坡基础在凝聚性土体的最小荷载上限值，模拟土体间的滑动破坏趋势与渐进式破坏行为。研究分析内容包含：（1）浅基础位于半无限空间；（2）在不同边坡坡角条件下，浅基础位于坡顶边缘处；（3）在不同边坡坡角条件下，浅基础位于不同坡缘距离等。经由数值计算分析结果显示，坡缘距离值愈小或边坡坡角愈陡峭时，边坡浅基础极限承载力值则愈小。换言之，当浅基础位于坡顶边缘处且坡角为垂直开挖情况时，则导致浅基础极限承载力降低约50 %。

关键词: 边坡浅基础, 极限承载力上限值, 无厚度界面单元, 有限单元分析, 渐进式破坏

Abstract: For research on the ultimate bearing capacity of shallow foundation on slope, it uses the finite element analysis with the multiple zero-thickness interface elements which considers the Coulomb’s failure criterion. The influence factors of ultimate bearing capacity, slope angle and distance from the slope margin are particularly studied. The minimum upper bound of bearing capacity and the behavior of progressive failure are also investigated in this research. The ultimate bearing capacity calculated in this study is taken account that shallow foundation is seated on (1) the semi-infinities ground, (2) the slope margin and (3) the distance from the slope margin. The results obtained shown that the ultimate bearing capacity of shallow foundation decreases as the values of influence factors decreases. In other words, while the shallow foundation seated on the slope margin during the vertical slope excavation, the value calculated of ultimate bearing capacity decreases about 50 % less than that obtained by the case of semi-infinities ground.

Key words: upper bound limit analysis, zero-thickness interface element, shallow foundation on slope, finite element analysis, progressive failure

中图分类号:

TU 470

李煜舲. 无厚度界面单元边坡浅基础极限承载力上限值的数值分析[J]. , 2007, 28(S1): 267-272.

LI Yu-lin. Numerical analysis of the upper bound limit analysis of shallow foundation on slope by using zero-thickness interface element approach[J]. , 2007, 28(S1): 267-272.

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