Three-Dimensional Stability of Unsaturated Excavation Slopes Under Different Seepage Conditions: A Case Study

Long Wang; Long Wang; Long Wang; Long Wang; Hu Deng; Meijuan Xu; Meijuan Xu; Zhihua Li; Yuanhang Nie; Qiuxia Huang; Wei Tang

doi:10.3389/feart.2022.903728

Frontiers in Earth Science (May 2022)

Three-Dimensional Stability of Unsaturated Excavation Slopes Under Different Seepage Conditions: A Case Study

Long Wang,
Long Wang,
Long Wang,
Long Wang,
Hu Deng,
Meijuan Xu,
Meijuan Xu,
Zhihua Li,
Yuanhang Nie,
Qiuxia Huang,
Wei Tang

Affiliations

Long Wang: School of Environment and Civil Engineering, Jiangnan University, Wuxi, China
Long Wang: State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu, China
Long Wang: Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, College of Civil Engineering and Architecture, Guangxi University, Nanning, China
Long Wang: Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning, China
Hu Deng: School of Environment and Civil Engineering, Jiangnan University, Wuxi, China
Meijuan Xu: Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, College of Civil Engineering and Architecture, Guangxi University, Nanning, China
Meijuan Xu: Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning, China
Zhihua Li: School of Environment and Civil Engineering, Jiangnan University, Wuxi, China
Yuanhang Nie: School of Environment and Civil Engineering, Jiangnan University, Wuxi, China
Qiuxia Huang: School of Environment and Civil Engineering, Jiangnan University, Wuxi, China
Wei Tang: School of Environment and Civil Engineering, Jiangnan University, Wuxi, China

DOI: https://doi.org/10.3389/feart.2022.903728
Journal volume & issue: Vol. 10

Abstract

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Three-dimensional stability analysis of soil slopes remains a hot topic in the field of geotechnical engineering. Considering the fluid–solid coupling effect, this study performs a number of numerical analyses on the stability of a 3D excavation slope located in the Wuxi Taihu Tunnel, China. Three typical cases of the issued slope are investigated, i.e., the slope at the initial state, with the water-stop curtain, and with both the water-stop curtain and concrete-sprayed layer. The shear strength reduction method was adopted to determine the factor of safety (FOS) of the slope. The distributions of pore pressures and wetting lines, the horizontal and vertical displacements, and the critical slip surface are presented. The results indicate that the water-stop curtain can prevent the groundwater seepage effectively. The water-stop curtain and concrete-sprayed layer are effective in restraining the slope deformation, altering the critical slip surface, and improving the slope safety.

Published in Frontiers in Earth Science

ISSN: 2296-6463 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science
Website: https://www.frontiersin.org/journals/earth-science

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