某码头软黏土岸坡破坏机制分析及重建

›› 2009, Vol. 30 ›› Issue (11): 3417-3422.

某码头软黏土岸坡破坏机制分析及重建

刘润¹，闫玥¹，闫澍旺¹，乔春生²

1. 天津大学建筑工程学院，天津 300072；2. 中国港湾工程有限责任公司，北京 100027

收稿日期:2008-05-29 出版日期:2009-11-10 发布日期:2010-01-07
作者简介:刘润，女，1974年生，博士，教授，主要从事岩土工程方面的教学和研究工作。

Study of failure mechanism of a soft clay slope and pier reconstruction

LIU Run¹，YAN Yue¹，YAN Shu-wang¹，QIAO Chun-sheng²

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. China Harbour Engineering Company Ltd., Beijing 100027, China

Received:2008-05-29 Online:2009-11-10 Published:2010-01-07

摘要/Abstract

摘要：

在某吹填软黏土岸坡上修建码头时发生了较大规模的滑坡，待滑体稳定后采取了一系列的工程措施，实现了码头的重建。详细阐述了岸坡发生滑动的全过程，通过现场勘察和有限元模拟分析了岸坡发生滑动破坏的原因。分别考虑了打桩与交通荷载作用，导致地基土中产生超静孔压，从而对岸坡的稳定性造成影响。分析结果表明，岸坡发生失稳破坏是多种不利工况叠加的结果，其主要原因是在低潮位时的超挖引起的，打桩及交通荷载作用也是造成滑坡的不利因素。在破坏的岸坡上重建码头，采用了振动砂桩加固地基，同时在地表铺碎石垫层作为预压荷载，加速地基土的固结。有限元分析和码头的成功重建表明，使用砂桩加固地基可以同时达到提高地基承载力和加速土体排水固结的目的，对于码头的重建是有效的技术措施。

关键词: 岸坡失稳, 有限元分析, 动力作用, 超静孔压, 地基加固

Abstract:

A large scale landslide took place when constructing a port on soft clay foundation. A series of engineering measures were taken for reconstructing the port. Detailed investigation and finite element analysis of slope stability were performed to determine the possible causes of slope failure. In the analysis, the excess pore water pressure in the subsoil caused by piling and the traffic load has been considered especially. The analyzing results show that the failure of the slope was caused by the superposition of several unfavorable operation conditions. It is concluded that the primary cause for the slope failure is under-cutting combined with the low tide level. Furthermore, the pile driving and the traffic load on the slope topside also play a negative role in slope failure. The pile driving construction has a notable impact on slope stability and the safety factor considering the piling effect is much less than that without considering it. However, the influence of the traffic load is not so large relatively. The ground at failed slope was rehabilitated using vibro-sand-piles together with a crushed stone layer on the ground surface for consolidation. Finite element method is applied to simulate the ground improvement effect. The analysis results and successful practice show that the use of sand piles for reinforcement and consolidation is an effective technique for rehabilitating the failed slope.

Key words: slope failure, finite element analysis, dynamic action, excess pore water pressure, ground improvement

中图分类号:

TU 470

刘润，闫玥，闫澍旺，乔春生. 某码头软黏土岸坡破坏机制分析及重建[J]. , 2009, 30(11): 3417-3422.

LIU Run1，YAN Yue，YAN Shu-wang，QIAO Chun-sheng. Study of failure mechanism of a soft clay slope and pier reconstruction[J]. , 2009, 30(11): 3417-3422.

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