（中国中元国际工程有限公司， 北京 100089）

［摘要］通过对多阶悬臂式挡土墙支护结构在填土区工程应用中发生的失稳破坏案例进行分析，采用库仑土压力理论，基于填土不同的内摩擦角φ、黏聚力c取值，计算得出悬臂式挡土墙主动土压力Ea与c，φ的变化曲线及主动土压力合力作用点高度Zy与c，φ的变化曲线；并通过有限元方法计算出填土在不同内摩擦角、黏聚力取值下挡土墙的应力-应变关系的变化趋势，揭示了当填土密实度较差，内摩擦角φ≤20°时土质边坡易形成整体滑移破裂面而导致悬臂式挡土墙失稳。强调了填土施工质量以及排水措施对填土区多阶支挡结构的重要性。

［关键词］填土区； 多阶； 悬臂式挡土墙； 解析分析； 有限元分析

中图分类号：TU413-6+2文献标识码：A文章编号：1002-848X(2016)24-0080-04

Analysis of instability failure mechanism for multi-level cantilever retaining wall

Zhang Yong， Wen Qingdong， Zhang Su， Meng Yongjie，  Liu Manhuai， Zheng Ximing

(China IPPR International Engineering Corporation, Beijing 100089, China)

Abstract:The case study of instability failure of multi-level cantilever retaining wall used in filling soil area was carried out. Coulomb′s Theory of Earth Pressure was adopted based on values of internal friction angle (φ) and cohesion (c) of different filling soils, to obtain the change curve of cantilever retaining wall′s active soil pressure (Ea)， c and φ as well as the change curve of height of resultant action point of active soil pressure(Zy), c and φ. The finite element method was used changing trend of stress-strain relationship of retaining wall with soil of different internal friction angle and cohesion values. It shows that when the compactness of soil is poor and the internal friction angle is smaller than 20°,  the soil slope is easy to form a whole slip rupture surface to cause instability of cantilever retaining wall. It emphasizes the importance of the quality of the fill soil construction and the drainage measures to the multi-level retaining structure in the filling soil area.

Keywords:filling soil area; multi-level; cantilever retaining wall; analytical analysis; FEA

作者简介：张勇，本科，工程师，Email:zhangyong@ippr.net。