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Analysis of Soil Deformation Induced by the Floating of a River-Crossing Metro Tunnel
(1 Fuzhou Architectural Design Institute, Fuzhou 350001; 2 School of Civil Engineering and Architecture, Nanchang Hangkong University, Nanchang 330063)
Abstract Based on a uniform soil-movement model for shield tunnelling, a soil-movement model with two tangential circles was established regarding the action of tunnel floating, and a two-dimensional solution for soil deformation under the superimposed effects of upward buoyancy and soil loss was obtained by the Melan formula. Using the Fuheqiao tunnel project, which is under construction, of the Nanchang Metro Line 1 as an example, a calculation model was established with the finite-element analysis software ABAQUS and an analog computation of soil deformation induced by tunnel floating was conducted. The calculations show that the derived two-dimensional solution to soil deformation was consistent with the results of the numerical simulation. The rule of soil deformation induced by floating a river-crossing tunnel was that the deformation pattern at the top of the river bottom was in the form of an "inverse settlement trough," the deformation pattern at the deep soil layer was a "double bow" shape, and its amplitude decreased with an increased distance to the tunnel axis.
Abstract：
Based on a uniform soil-movement model for shield tunnelling, a soil-movement model with two tangential circles was established regarding the action of tunnel floating, and a two-dimensional solution for soil deformation under the superimposed effects of upward buoyancy and soil loss was obtained by the Melan formula. Using the Fuheqiao tunnel project, which is under construction, of the Nanchang Metro Line 1 as an example, a calculation model was established with the finite-element analysis software ABAQUS and an analog computation of soil deformation induced by tunnel floating was conducted. The calculations show that the derived two-dimensional solution to soil deformation was consistent with the results of the numerical simulation. The rule of soil deformation induced by floating a river-crossing tunnel was that the deformation pattern at the top of the river bottom was in the form of an "inverse settlement trough," the deformation pattern at the deep soil layer was a "double bow" shape, and its amplitude decreased with an increased distance to the tunnel axis.
YUAN Wen-Jun-1,
Zhang-Shao-Qin-2
.Analysis of Soil Deformation Induced by the Floating of a River-Crossing Metro Tunnel [J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(4): 73-80
2014, Vol. 51 