Model tests on stress and deformation mechanism of diaphragm wall under combined effects of dewatering and excavation

CHI Minliang; LIANG Luju; XU Changjie; YANG Kaifang; DING Zhi

doi:10.11779/CJGE20230889

Volume 47 Issue 2

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Chinese Journal of Geotechnical Engineering > 2025 > 47(2): 365-375. > DOI: 10.11779/CJGE20230889

CHI Minliang, LIANG Luju, XU Changjie, YANG Kaifang, DING Zhi. Model tests on stress and deformation mechanism of diaphragm wall under combined effects of dewatering and excavation[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(2): 365-375. DOI: 10.11779/CJGE20230889

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Model tests on stress and deformation mechanism of diaphragm wall under combined effects of dewatering and excavation

CHI Minliang^1,,
LIANG Luju^{1, 2},
XU Changjie^{1, 3},
YANG Kaifang^{1, 2, ,},
DING Zhi^{1, 2}

1.
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2.
School of Engineering, Hangzhou City University, Hangzhou 310015, China
3.
Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang 330013, China

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Received Date: September 12, 2023
Available Online: June 04, 2024

Graphical Abstract

Abstract

Abstract

In order to reveal the mechanism of stress and deformation of the diaphragm wall under combined effects of dewatering and excavation, the processes of dry sand excavation and excavation with dewatering are carefully simulated by conducting a series of laboratory model tests, and the data such as pore-water and earth pressures at both sides of the diaphragm wall, settlements outside the pit, bending moments and lateral displacements of the wall are collected. By comparing the characteristics of variations and internal connections of stress and deformation of the diaphragm wall under different conditions, the mechanism of stress and deformation of the diaphragm wall caused by excavation with dewatering is analyzed. The results show that the distribution patterns of lateral earth pressures at both sides of the diaphragm wall will be changed by both dewatering and excavation. The lateral earth pressures change more significantly under the combined effects of dewatering and excavation compared with the case of dry sand excavation, there will be less passive earth pressure zone in front of the diaphragm wall, while the peak positions of lateral earth pressures behind the diaphragm wall will move down. On this occasion, the diaphragm wall will develop greater bending moments and induce more significant lateral displacements.
- dewatering,
- excavation,
- model test,
- lateral displacement of diaphragm wall,
- pore-water pressure,
- earth pressure

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References (23)

References

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