河床冲刷对大断面水下隧道变形影响  

Influences of riverbed erosion on deformation of large cross-section underwater tunnels

作　　者：王乐明 罗基伟 张宇亭[2] 孟庆余 左殿军[2] 马志富 安晓宇 孟毅 赵跃 WANG Leming;LUO Jiwei;ZHANG Yuting;MENG Qingyu;ZUO Dianjun;MA Zhifu;AN Xiaoyu;MENG Yi;ZHAO Yue(China Railway Design Corporation,Tianjin 300308,China;National Engineering Research Center of Port Hydraulic Construction Technology,Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin,300456,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308 [2]交通运输部天津水运工程科学研究院港口水工建筑技术国家工程研究中心,天津300456

出　　处：《岩土工程学报》2024年第S01期107-111,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2022YFB2602800);国家自然科学基金青年基金项目(52308401);中国国家铁路集团有限公司科技研究开发计划项目(K2022G057)。

摘　　要：河床冲刷是水下隧道长期运营中面临的一个新问题。受径流量变化、河床泥沙条件等因素影响,上覆河床冲刷会导致隧道埋深和荷载变化,使其产生不均匀变形,影响隧道安全。本研究围绕河床冲刷下大断面过江隧道的变形响应问题,采用离心试验研究多次冲刷后隧道变形发展进程,分析了内部衬砌增大结构刚度来抵抗冲刷卸载变形的机理;分析了不同冲刷深度下隧道变形增长的非线性行为,揭示了冲刷过程中淤泥质地层对隧道变形的不利影响;分析了河道冲刷引起的盾构管片衬砌环缝张开变形特征,明确了内部衬砌有利于避免管片衬砌环缝张开的不利影响。The riverbed erosion caused by runoff changes and sediment conditions has become a new problem for underwater tunnels during its long-term operation.The riverbed erosion overlying the tunnel can lead to changes in burial depth and load,which can cause significant uneven deformation and affect tunnel safety.This study focuses on the deformation response of large cross-section underwater tunnels caused by erosion.The centrifugal test method is used to study the deformation of tunnels caused by multiple erosions.According to the model tests,the internal lining increases the structural stiffness and resists deformation of tunnels caused by erosion unloading.The nonlinear growth of deformation with different erosion depths is analyzed.The muddy clay layer is unfavorable for deformation of tunnels during erosion development.The gap opening of shield segments caused by erosion is analyzed.The internal lining is beneficial for avoiding the disadvantage of segment opening.

关 键 词：盾构 水下隧道 河床冲刷 卸载 变形 

分 类 号：TU411[建筑科学—岩土工程]