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Frontiers of Structural and Civil Engineering >> 2012, Volume 6, Issue 2 doi: 10.1007/s11709-012-0149-7

A real-life stability model for a large shield-driven tunnel in heterogeneous soft soils

1. Department of Civil Engineering, Shanghai Institute of Technology, Shanghai 201418, China; 2. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 3. Institute of Applied Geosciences, Graz University of Technology, Graz 8010, Austria

Available online:2012-06-05

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The current models that have been published to date only allow for homogeneous soil at the tunnel face. This paper presents a real-life face stability model to determine the minimal pressure needed at the tunnel face for a large shield-driven tunnel in heterogeneous soft soils. It is found that the influence of multilayered soil boundaries is significant, especially for the mixed-layer (e.g., sand and clay) soils. The suggested M-M model is developed by considering the influence of the heterogeneity of the soil on the angle of slip and the minimal support pressure. Comparisons of the solutions in mixed-layer soils are conducted, and the effects of the involved parameters for a large, multilayered, shield-driven tunnel are also investigated.

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