A discrete numerical approach for modeling face stability in slurry shield tunnelling in soft soils |
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| Authors: | ZX Zhang XY Hu Kieffer D Scott |
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| Institution: | 1. Key Laboratory of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China;3. Institute of Applied Geosciences, Graz University of Technology, Graz 8010, Austria |
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| Abstract: | In this paper, a numerical simulation method for evaluating tunnelling-induced ground movement is presented. The method involves discrete element simulation of TBM slurry shield advancement and considers explicitly soil excavation from the face, effects of varying face support pressure, and the influence of tunnel cover depth. For the cases studied, it is found that for tunnel cover depths (C/D) between 0.7 and 2.1, ground deformations inducing by the tunnelling can be controlled within a certain extent and tunnel face stability can ensured, provided the support pressure ratio (N) lies between 0.8 and 1.5. The proposed method is reasonably benefited to modeling the face stability in shield-driven tunnels in soft soils. |
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| Keywords: | Slurry shield tunnelling Numerical simulation Face stability Failure mechanism |
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