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矩形闭合墙桥梁基础墙-土-承台相互作用研究
引用本文:文华,程谦恭,孟凡超,陈晓东.矩形闭合墙桥梁基础墙-土-承台相互作用研究[J].土木工程学报,2007,40(8):67-73.
作者姓名:文华  程谦恭  孟凡超  陈晓东
作者单位:1. 西南交通大学,四川成都,610031
2. 中交公路规划设计院,北京,100010
基金项目:国家自然科学基金;国家自然科学基金;交通部西部交通建设科技项目
摘    要:矩形闭合地下连续墙基础是一种新型的桥梁基础。通过室内模型试验,对闭合墙基础墙-土-承台相互作用进行系统的研究。试验研究表明:闭合墙基础承台土反力分布的总体特征是承台下土芯的角点处最大,边缘处次之,中心区最小。在一定范围内,承台下土芯截面积越大,承台土反力分布越趋于均匀化。承台对上部墙段的内摩阻力存在"削弱效应",而对下部墙段的内摩阻力则有一定的"增强效应",承台对墙端阻力也有一定的"增强效应"。承台土反力的荷载分担比约为10%~20%,若在闭合墙的竖向承载力计算方法中,不考虑承台的作用,忽略承台土反力,是不合理的。模型试验和分析结果为矩形闭合地下连续墙基础的设计计算提供了重要依据。

关 键 词:地下连续墙  桥梁基础  低承台  相互作用
文章编号:1000-131X(2007)08-0067-07
修稿时间:2007年1月8日

Diaphragm wall-soil-cap interaction in rectangular-closed-diaphragm-wall bridge foundations
Wen Hua,Cheng Qiangong,Meng Fanchao,Chen Xiaodong.Diaphragm wall-soil-cap interaction in rectangular-closed-diaphragm-wall bridge foundations[J].China Civil Engineering Journal,2007,40(8):67-73.
Authors:Wen Hua  Cheng Qiangong  Meng Fanchao  Chen Xiaodong
Abstract:Rectangular-closed-diaphragm-wall foundation is a new type of bridge foundation. Diaphragm wall-soil-cap interaction was studied through a model test. It was observed that the distribution of soil resistance under the cap is not homogeneous. Soil resistance in the corner under the cap is larger than that in the border, and soil resistance in the center is the smallest. The distribution of soil resistance under the cap will be more uniform, if sectional area of soil core is enlarged to a certain extent. Due to the existence of the cap, there is "weakening effect" in inner shaft resistance of the upper wall segments, and there is "enhancement effect" in the lower wall segments and in the toe resistance. Load shearing percentage of soil resistance under the cap is 10%~20%. It is unreasonable to ignore the effects of the cap and the soil resistance under the cap in bearing capacity calculations.
Keywords:diaphragm wall  bridge foundation  low cap  interaction
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