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2009年 第3卷 第1期

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《结构与土木工程前沿（英文）》 >> 2009年 第3卷 第1期 doi: 10.1007/s11709-009-0015-4

Diaphragm wall-soil-cap interaction in rectangular-closed- diaphragm-wall bridge foundations

1. College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China; 2. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3. China Highway Planning and Design Institute, Beijing 100010, China

发布日期： 2009-03-05
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摘要

Rectangular-closed-diaphragm-wall foundation is a new type of bridge foundation. Diaphragm wall-soil-cap interaction was studied using a model test. It was observed that the distribution of soil resistance under the cap is not homogeneous. The soil resistance in the corner under the cap is larger than that in the border; and that in the center is the smallest. The distribution of soil resistance under the cap will be more uniform, if the sectional area of soil core is enlarged within a certain range. Due to the existence of cap, there is a “weakening effect” in inner shaft resistance of the upper wall segments, and there is “enhancement effect” in the lower wall segments and in toe resistance. The 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.

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