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01-07-2024 | Original Paper

Study on rock stability and structural response of shield-driven twin tunnels crossing fault fracture zone based on 3d numerical simulation

Authors: Chengwen Wang, Xiaoli Liu, Wenli Yao, Enzhi Wang, Nan Hu, Zhiyi Huang, Yiqi Sun

Published in: Bulletin of Engineering Geology and the Environment | Issue 7/2024

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Abstract

The occurrence of fault fracture zones is a frequently encountered geological impediment while carrying out shield-driven twin tunnels, which presents significant hazards to the construction process. To examine the impact of these zones on shield-driven twin tunnels, an improved three-dimensional numerical model is utilized, based on the three-dimensional discrete fracture network (DFN) approach. This model assesses the surrounding rock’s deformation, the lining response, and the excavation plastic zone (EPZ). The joint orientation, joint density, and lagging distance are systematically analyzed. The research findings indicate that the surrounding rock response occurs mainly during the passage of the shield machine, with twin-tunnel excavation leading to the increased response of the surrounding rock and lining. Joint orientation poses complexities for twin-tunneling excavation, as discontinuities intersect the tunnel axis obliquely, leading to elevated construction risk. Large joint density weakens the overall strength of the surrounding rock, rendering it more akin to a soft equivalent homogeneous medium. Lagging distance primarily influences the surrounding rock’s deformation and lining response, emphasizing the need for a larger lagging distance in twin-tunnel construction. These results establish a solid theoretical basis for shield-driven twin tunnels crossing fault fracture zones construction.

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Literature
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Metadata
Title
Study on rock stability and structural response of shield-driven twin tunnels crossing fault fracture zone based on 3d numerical simulation
Authors
Chengwen Wang
Xiaoli Liu
Wenli Yao
Enzhi Wang
Nan Hu
Zhiyi Huang
Yiqi Sun
Publication date
01-07-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 7/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03777-9

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