<<
[an error occurred while processing this directive] | [an error occurred while processing this directive] >>
Prediction of Long-Term Settlement Caused by Subway Operation under the Influence of Initial Consolidation
(1 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027; 2 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 3Zhejiang Provincial Natural Gas Development Co. Ltd., Hangzhou, 310058;
4 Hangzhou Luoda Communications, Municipal Engineering Planning and Design Institute Co. Ltd., Hangzhou 310006)
Abstract Long-term settlement caused by subway operation can be divided into settlement caused by undrained accumulated residual deformation and consolidation settlement caused by cyclic pore pressure dissipation, the former of which is obtained by the layer-wise summation method based on the empirical formula of accumulated plastic deformation and a three-dimensional finite-element model of the foundation soil stress, and the latter of which is obtained by a dynamic triaxial test that simulates pore pressure change rules under different initial consolidation degrees. Through fitting of experimental data, a pore pressure calculation model is established for the Hangzhou soft soil under different consolidation degrees and cyclic loading, and combined with the consolidation settlement calculated by one-dimensional Terzaghi consolidation theory, long-term settlement under cyclic subway traffic loading can be obtained. The results show that settlement caused by residual deformation develops rapidly at the early loading stage, settlement caused by pore pressure dissipation occupies about 30% of the total settlement, and this ratio decreases with the increase of the consolidation degree and tends to be stable after six months.
Abstract：
Long-term settlement caused by subway operation can be divided into settlement caused by undrained accumulated residual deformation and consolidation settlement caused by cyclic pore pressure dissipation, the former of which is obtained by the layer-wise summation method based on the empirical formula of accumulated plastic deformation and a three-dimensional finite-element model of the foundation soil stress, and the latter of which is obtained by a dynamic triaxial test that simulates pore pressure change rules under different initial consolidation degrees. Through fitting of experimental data, a pore pressure calculation model is established for the Hangzhou soft soil under different consolidation degrees and cyclic loading, and combined with the consolidation settlement calculated by one-dimensional Terzaghi consolidation theory, long-term settlement under cyclic subway traffic loading can be obtained. The results show that settlement caused by residual deformation develops rapidly at the early loading stage, settlement caused by pore pressure dissipation occupies about 30% of the total settlement, and this ratio decreases with the increase of the consolidation degree and tends to be stable after six months.
.Prediction of Long-Term Settlement Caused by Subway Operation under the Influence of Initial Consolidation[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(2): 114-120
2016, Vol. 53 