岩土力学2024，Vol.45Issue(7)：2024-2036,13.DOI:10.16285/j.rsm.2023.1236
基于广义Voigt模型的半渗透边界隧道周围饱和软土固结分析
Consolidation analysis of saturated soft soils surrounding tunnels with semi-permeable boundary based on the generalized Voigt model
摘要
Abstract
This study investigates the rheological properties of saturated soft clay surrounding a tunnel using the generalized Voigt viscoelastic model.The model incorporates linear semi-permeability boundary conditions to describe the behavior of the clay.Furthermore,two-dimensional rheological consolidation control equations are derived based on the Terzaghi-Rendulic theory,considering the excess pore water pressure as a variable.To solve the equations,conformal transformation and separation of variables methods are employed,resulting in two independent equations representing the excess pore pressure in terms of time and space variables.The Laplace transformation and partial fractional summation method are then utilized to obtain the solution for excess pore pressure dissipation in the time domain.The reliability of the solution is verified by comparing it with the existing four-element Burgers and five-element model,both of which are derived from the generalized Voigt model.Furthermore,the influence of liner permeability,Kelvin body number,independent Newtonian dashpot viscosity coefficient,and tunnel depth on the dissipation and distribution of excess pore pressure is analyzed based on the established solutions.The findings indicate that a higher relative permeability of the liner and soil leads to an earlier onset of excess pore pressure dissipation and a faster dissipation rate.Increasing the number of Kelvin bodies results in slower dissipation rate.Moreover,larger independent viscous coefficients lead to smaller viscous deformation and faster dissipation rates.Additionally,greater tunnel depth prolongs soil percolation path,slowing down the dissipation of excess pore pressure.When the relative permeability coefficient is 0.01,the excess pore pressure gradually decreases with distance from the outer wall of the tunnel.However,when the relative permeability coefficient is 1,the excess pore pressure initially increases and then decreases with distance.As the relative permeability coefficient increases,the influence of the number of Kelvin bodies on the dissipation of super pore pressure diminishes,the variation in super pore pressure dissipation caused by different independent Newtonian dashpot viscosity coefficients gradually decreases,and the role of tunnel liners as new permeable boundaries within the soil layer is becoming increasingly prominent.关键词
黏弹性地基/半渗透边界/广义Voigt模型/超孔隙水压力/流变固结Key words
viscoelastic foundation/semi-permeable boundary/generalized Voigt model/excess pore pressure/rheological consolidation分类
建筑与水利引用本文复制引用
谢森林,胡安峰,肖志荣,汪美慧,胡训健,陈俞超..基于广义Voigt模型的半渗透边界隧道周围饱和软土固结分析[J].岩土力学,2024,45(7):2024-2036,13.基金项目
国家自然科学基金(No.52378419,No.51978612) （No.52378419,No.51978612）
国家留学基金(No.202306320346) （No.202306320346）
浙江省新苗人才计划项目(No.2023R401189).This work was supported by the National Natural Science Foundation of China(52378419,51978612),the China Scholarship Council(202306320346)and the Zhejiang Xinmiao Talents Program(2023R401189). （No.2023R401189）
