Diaphragm wall-soil-cap interaction in rectangular-closeddiaphragm-wall bridge foundations |
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Authors: | Hua Wen Qiangong Cheng Fanchao Meng and Xiaodong Chen |
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Affiliation: | (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 |
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Abstract: | Rectangular-closed-diaphragm-wall foundation is a new type of bridge foundation. Diaphragm wallsoil-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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Translated from China Civil Engineering Journal, 2007, 40(8): 67–73 译自: 土木工程学报] |
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Keywords: | diaphragm wall bridge foundation low cap interaction |
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