Abstract
During TBM construction of urban underground tunnels, it is necessary to strictly measure the surface subsidence, crown settlement inside the tunnel, clearance convergence, horizontal, and vertical displacement of pile wall. In this study, to better understand the TBM construction parameters and the stress and displacement inside the tunnels and pile wall with time, a nonlinear viscoelastic constitutive equation for variable modulus considering the time effect is established. Through laboratory tests on the sandy mudstone samples of Chongqing Metro Line 9, basic mechanical parameters are obtained, and the calculation parameters of the constitutive equation for variable modulus are also obtained. By using generalized rheological theory, numerical calculations are performed on the surface subsidence and surrounding rock deformation, with the calculation results basically consistent with the field measurement results. The accumulative change value for surface subsidence is subject to logarithmic law, and our results can be used to quantitatively guide the collaborative relationship between tunnel excavation and support, dynamically adjust TBM construction parameters, and predict surface subsidence and surrounding rock deformation, thereby providing guidance and reference for similar projects.
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Wang, F. Evaluation of Surface Subsidence During TBM Construction of Urban Tunnels Based on Generalized Rheological Theory. Geotech Geol Eng 40, 1323–1330 (2022). https://doi.org/10.1007/s10706-021-01965-y
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DOI: https://doi.org/10.1007/s10706-021-01965-y