渗漏病害加剧影响下隧道周围土体流变固结分析

doi:10.13722/j.cnki.jrme.2023.1183

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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 words： tunnel engineering exacerbated leakage disease visco-elasticity foundation generalized Voigt model semi permeable boundary excess pore water pressure

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	Articles by authors
	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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