Abstract
Due to the frequent occurrence of large-scale water gushing accidents in loess metro tunnels under local water environment, which seriously affects the safety of tunnel structure. To study the response mechanism of loess metro tunnel under local water environment, a comprehensive method of combining theoretical derivation and numerical simulation were conducted in this study. The results show that loess forms a certain scale collapsibility cavity under the influence of local water immersion. The collapsibility softening load acting on the lining structure is approximately isosceles triangle, and the dominant migration channel extends and develops along the two waist. The expressions of internal force and deformation of loess metro tunnel structure under different collapsible conditions are derived. Under the actual case, the internal force and deformation of the tunnel structure are related to the distance from the collapse center, so three influence zones are defined: strong, weak and none. It is approximately symmetrically distributed within 20 m around the collapse center, and the maximum deflection, rotation angle, shear force and bending moment are 2.3345 mm, 2.48 rad, 1280 kN and 2560 kN m, respectively. The area within 10 m from the collapse center is defined as a strong influence area. The closer to the collapse center, the growth law is close to linear growth. The scope of the collapse area (− 20 to − 10 m, 10 to 20 m) is called the weak influence area, and the deformation or internal force change little, while the other scope is basically unchanged and tends to be stable, which is called the no influence area. Further, due to the numerical simulation appropriately simplifies the leakage water source, it cannot fully reflect the evolution behavior of loess collapsible area under local immersion conditions, resulting in the simulation results being slightly smaller than the theoretical calculation, but the change trend is relatively consistent.
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We also acknowledge the editor for the valuable suggestion.
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This research work was jointly supported by the National Natural Science Foundation of China (No. 51978066), the Project Program of Key Laboratory of Urban Underground Engineering of Ministry of Education (No.TUL2020-01), the Construction Science and Technology Project of Xi’an (No. SZJJ2019–23) and the Key R&D Plan of Shaanxi Province (No. 2020SF-428).
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Qiu, J., Fan, F., Zhang, C. et al. Response mechanism of metro tunnel structure under local collapse in loess strata. Environ Earth Sci 81, 164 (2022). https://doi.org/10.1007/s12665-022-10256-5
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DOI: https://doi.org/10.1007/s12665-022-10256-5