地下连续墙在深厚覆盖层地基处理中的适宜性研究  

SUITABILITY STUDY OF DIAPHRAGM WALL IN FOUNDATION TREATMENT WITH THICK OVERBURDEN LAYER

作　　者：巨能攀[1] 赵润莲 周喜德[1] 

机构地区：[1]成都理工大学地质灾害防治与环境保护国家重点实验室,成都610059 [2]内蒙古自治区地质环境监测院,呼和浩特010020

出　　处：《工程地质学报》2009年第6期836-841,共6页Journal of Engineering Geology

摘　　要：西南山区河谷广泛分布有深厚覆盖层,它们不但制约水电坝址的选择,同时也给水工建筑的设计和基础处理带来困难,传统沉井方法在深厚覆盖层地基处理中的问题日渐突出。本文从地下连续墙结构构成、受力、施工技术等角度对地下连续墙方案进行了综合研究,在地基岩土体工程地质条件清楚认识的基础上,充分考虑了地下连续墙受力特征,采用三维有限元方法,分析了坝体整体结构及地下连续墙复合挡土墙体系在各种工况下的受力变形特点。结果表明,地下连续墙结构充分调动了墙体和土体的相互作用效应,连续墙体的受力状况可满足建筑物的安全要求,是深厚覆盖层中地基处理的一种有效方法。地下连续墙的变形和内力受到剪力墙的接头形式和接触面强度的控制,在施工过程必须进行有效的控制。Deep overburden layers are widely distributed in the southwest regions of China. They not only restrict the hydropower dam site selection, but also make great difficulty to the design of hydraulic structures and foundation treatment. As a result, the traditional open caisson method in deep overburden foundation treatment has become in- applicable. The diaphragm wall is one of the many traditional construction methods for dealing with coating solid foundation, with the function of both soil block in and dam body foundation. In view of that, this paper studies the force on the structure and the construction technology. It has a clear understanding of the general engineering geo- logical conditions of rock and soil. It fully considers the force characteristics of diaphragm wall. It uses the three - dimensional finite element method to analysis the deformation and stability of the overall structure of the dam and the diaphragm wall composite retaining wall system in the most adverse conditions. The result shows that it meets the design requirements of the force on structure and with large secure reserves. The diaphragm wall foundation technology will be capable of large - scale construction. The comprehensive analysis verifies the suitability of the new program and made some construction propose on the characteristic of force on the structure, and provides refer- ence for the similar design and construction of major projects.

关 键 词：地下连续墙 深厚覆盖层 地基处理 适宜性 接触面 

分 类 号：P642[天文地球—工程地质学]