|Table of Contents|

Experimental study on force and deformation characteristics of foundation pit under asymmetric load(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年06期
Page:
167-176
Research Field:
岩土工程
Publishing date:

Info

Title:
Experimental study on force and deformation characteristics of foundation pit under asymmetric load
Author(s):
DING Xiaowen1;  ZENG Xiaoguang1;  LIN Zhaorui2; 3;  XU Changjie2; 3;  DING Haibing2; 3
(1. Jiangxi Transportation Research Institute Co., Ltd., Nanchang 330200, Jiangxi, China; 2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 3. Jiangxi Key Laboratory of Geotechnical Infrastructure Safety and Control, East China Jiaotong University, Nanchang 330013, Jiangxi, China)
Keywords:
asymmetric load;  foundation pit excavation;  indoor modelling test;  supporting structure;  earth pressure;  deformation
PACS:
TU94
DOI:
10.19815/j.jace.2024.05083
Abstract:
Through the 1g(g is acceleration of gravity)indoor model test, the load difference between two sides of the foundation pit was taken as the main parameter to study the force and deformation of the internal braced deep foundation pit excavation under asymmetric load. The results show that under asymmetric load, the internal braced deep foundation pit presents a “belly-type” dislocation pattern with two large ends and small center. When the foundation pit load is small and the side load is 0, as the asymmetric load difference between the two sides of the pit increases, the displacement of the supporting structure on the side with large load increases, while the displacement of the side with small load decreases, and even “push-back displacement” may occur. The increase of the asymmetric load difference can affect the earth pressure on both sides of the supporting pile. The passive earth pressure on the side of the supporting pile with large load presents a significant nonlinear with the increase of the load difference, the active earth pressure decreases with the increase of the load difference. The passive earth pressure distribution on the side of the supporting pile with small load has a weak nonlinear, and the active earth pressure increases with the increase of the load difference. In the design, the economy and safety of foundation pit can be improved by optimizing the pile length. For the surface settlement outside the pit, the side with larger load increases significantly with the increase of load, and the side with smaller load is basically unaffected by the load difference. The research findings can provide an effective reference basis for similar asymmetric pit design and construction.

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Last Update: 2025-11-25