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  2024, Vol. 43 Issue (10): 2570-2580    DOI: 10.13722/j.cnki.jrme.2023.1183
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Rheological consolidation analysis of soil around tunnels under exacerbated leakage conditions
XIE Senlin1,HU Anfeng1,XIAO Zhirong2,CHEN Yuan3,WANG Meihui4
(1. Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;2. School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou,Zhejiang 310023,China;3. PowerChina Huadong Engineering Corporation,Hangzhou,Zhejiang 311122,China;4. School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)
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Abstract  Leakage is a common disease in subway tunnels,and as the operational time increases,the extent of tunnel leakage will gradually escalate. The local leakage coefficient is introduced to describe the process of increased permeability of the lining caused by leakage diseases. The generalized Voigt model is utilized to characterize the rheological properties of soft clay. Based on the Terzaghi-Rendulic theory,an equation is established to describe the consolidation process of saturated soft soil around a tunnel under changing lining permeability. The expression for dissipation of excess pore water pressure is derived using the method of complex variables. The generalized Voigt model is degenerated into existing models for comparison,validating the reliability of the proposed approach. With the Shanghai Metro Line 1 tunnel as the engineering background,the effects of initial permeability of the lining,local leakage coefficient,and parameters of the generalized Voigt model on the dissipation and distribution of excess pore water pressure are analyzed. The results indicate that when the ratio of the initial permeability of the lining to soil permeability exceeds a certain value,there is a tendency for complete dissipation of excess pore water pressure under the effects of exacerbated leakage disease. The larger the local leakage coefficient,the earlier the dissipation of excess pore pressure begins and the faster the dissipation rate. The effects of the number of Kelvin bodies and the viscosity coefficient on excess pore water pressure is concentrated in the middle consolidation stage. More Kelvin bodies and smaller viscosity coefficient result in slower dissipation of excess pore pressure. For the engineering case in this study,when the time is less than 1×105 days,the excess pore pressure above the tunnel decreases gradually with depth,and then the position of maximum excess pore pressure continuously moves towards the ground surface.
Key wordstunnel engineering      exacerbated leakage disease      visco-elasticity foundation      generalized Voigt model      semi permeable boundary      excess pore water pressure     
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XIE Senlin1
HU Anfeng1
XIAO Zhirong2
CHEN Yuan3
WANG Meihui4
Cite this article:   
XIE Senlin1,HU Anfeng1,XIAO Zhirong2, et al. Rheological consolidation analysis of soil around tunnels under exacerbated leakage conditions[J]. , 2024, 43(10): 2570-2580.
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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1183      OR      https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2570
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