渗漏病害加剧影响下隧道周围土体流变固结分析  

Rheological consolidation analysis of soil around tunnels under exacerbated leakage conditions

作　　者：谢森林 胡安峰[1] 肖志荣 陈缘 汪美慧 XIE Senlin;HU Anfeng;XIAO Zhirong;CHEN Yuan;WANG Meihui(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou,Zhejiang 310023,China;PowerChina Huadong Engineering Corporation,Hangzhou,Zhejiang 311122,China;School of CivilEngineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江科技大学土木与建筑工程学院,浙江杭州310023 [3]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [4]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《岩石力学与工程学报》2024年第10期2570-2580,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金面上项目(52378419,51978612);浙江省新苗人才计划项目(2023R401189)。

摘　　要：渗漏水是地铁隧道常见病害之一,随着运营时间的增加,隧道渗漏程度将逐渐增大。引入局部渗漏系数描述渗漏病害引起的衬砌渗透性增长过程,使用广义Voigt模型表征软土流变特性,基于Terzaghi-Rendulic理论建立衬砌渗透性变化情况下的隧道周围饱和软土固结控制方程,采用复变函数法推导出超孔隙水压力消散表达式,将广义Voigt模型退化为已有模型并对比,验证了本文解答可靠性。基于建立的解答,以上海地铁1号线隧道为工程背景,分析衬砌初始透水性、局部渗漏系数、广义Voigt模型参数对超孔隙水压力消散与分布的影响。结果表明:当衬砌初始渗透系数与土体渗透系数比值超过一定值时,在渗漏病害逐渐加剧的影响下,超孔隙水压力有完全消散的趋势;局部渗漏系数越大,超孔隙水压力消散起始时间越早且速度越快;Kelvin体数量及黏滞系数对超孔隙水压力的影响集中在固结中期,Kelvin体数量越多、黏滞系数越小,超孔压消散速度越慢;针对本文工程算例,当时间小于1×105 d时,随着深度减小,隧道正上方土体超孔隙水压力逐渐减小,之后最大超孔压位置不断向地表方向移动。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.

关 键 词：隧道工程 渗漏病害加剧 黏弹性地基 广义Voigt模型 半渗透边界 超孔隙水压力 

分 类 号：U45[建筑科学—桥梁与隧道工程]