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Erschienen in:
2023 | OriginalPaper | Buchkapitel
Dynamic Failure Process of Soil Particles at the End of Shield Tunnel Based on Discrete Element
verfasst von : Zheyuan Feng, Bin Liu, Sijun Zhang, Fei Kang, Haipeng Hui, Qiang Tang
Erschienen in: Advances in Geospatial Technology in Mining and Earth Sciences
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Abstract
The soil at the end of the shield tunnel has large local deformation and strong nonlinearity; thus, the finite element method based on continuum mechanics cannot simulate the failure process of the soil at the end well. In order to analyze the dynamic failure process of soil particles at the end, a discrete element model of shield tunnel was established; the displacement, stress and settlement of soil particles were tracked, and the failure mechanism was analyzed. The results show that the end soil finally forms a circular arc shear zone with a slip radius of 0.87 m. The contact stress of the soil at the entrance shows a decreasing trend with time. Nonlinear settlement occurs on top of soil, and the final settlement reached 38.20 mm. The soil failure at the end of the shield tunnel presents a gradual development of slip failure characteristics. The soil slip failure surface at the end of the shallow-buried shield tunnel is a combined slip mode.