不同程度渗漏水对盾构隧道长期沉降影响规律研究  

Study on the Influence of Different Degrees of Leakage on Long-term Settlement of Shield Tunnels

作　　者：李翔宇 李新源 李明宇[4] 杨潇 黄沛[6] LI Xiangyu;LI Xinyuan;LI Mingyu;YANG Xiao;HUANG Pei(State Key Laboratory of Building Safety and Built Environment,Beijing 100013;Foundation Engineering Research Institute of China Academy of Building Sciences,Beijing 100013;School of Civil Engineering,Xuzhou University of Technology,Xuzhou 221018;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001;Wuhan Metro Group Co.,Ltd.,Wuhan 430070;School of Architectural Engineering,Chang′an University,Xi′an 710061)

机构地区：[1]建筑安全与环境国家重点实验室,北京100013 [2]中国建筑科学研究院有限公司地基基础研究所,北京100013 [3]徐州工程学院土木工程学院,徐州221018 [4]郑州大学土木工程学院,郑州450001 [5]武汉地铁集团有限公司,武汉430070 [6]长安大学建筑工程学院,西安710061

出　　处：《现代隧道技术》2022年第5期72-79,共8页Modern Tunnelling Technology

摘　　要：针对软土地区盾构隧道日益突出的长期沉降问题,以上海地铁2号线工程为研究背景,考虑土体固结与渗流耦合,采用FLAC 3D数值模拟方法研究了施工扰动后黏弹性土体中隧道在不同渗漏工况下的长期沉降规律,并综合分析了不同程度渗漏水对隧道周围土体超孔压的消散、孔压分布、隧道和地面长期沉降的影响规律。研究发现,当隧道衬砌发生渗漏时,随着时间的增长,超孔隙水压力不断消散,消散速度随距隧道的距离由近到远逐渐变小;相对渗透系数越大,隧道衬砌的透水能力越强,经过相同时间其孔压的降低也越明显;隧道沉降随时间持续增大,相对渗透系数越大,在相同时刻的隧道沉降则愈大,形成的地面沉降槽曲率也越大。To address the increasingly prominent long-term settlement problem of shield tunnels in soft soil areas,the Shanghai Metro Line 2 project is used as the study case.Considering the coupling of soil consolidation and seepage,the long-term settlement pattern of tunnels in viscoelastic soil under different seepage conditions after construction disturbance is studied by using FLAC 3D numerical simulation method.And the influence patterns of different degrees of water seepage on the dissipation of excess pore pressure in the soil around the tunnel,pore pressure distribution,and long-term settlement of the tunnel and ground were comprehensively analyzed.It was found that when tunnel lining leakage occurs,the excess pore water pressure dissipates continuously with the growth of time,and the dissipation rate becomes gradually smaller with the distance to the tunnel from near to far.The larger the relative permeability coefficient,the stronger the permeability of the tunnel lining,and the more obvious the reduction of its pore pressure after the same time;tunnel settlement continues to increase with time,the larger the relative permeability coefficient,the greater the tunnel settlement at the same moment,and the greater the curvature of the ground settlement trough formed.

关 键 词：盾构隧道 长期沉降 渗漏水 渗漏程度 超孔隙水压力 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]