土岩复合地层中盾构施工引起的地表位移预测  

Prediction of surface displacement caused by shield construction in soil-rock composite strata

作　　者：齐永洁 朱建才[2,4] 周建 周思剑[1,3] 李东泰 魏纲 QI Yongjie;ZHU Jiancai;ZHOU Jian;ZHOU Sijian;LI Dongtai;WEI Gang(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310012,China;Engineering Research Center of Urban Underground Development of Zhejiang Province,Zhejiang University,Hangzhou 310058,China;Architectural Design and Research Institute of Zhejiang University,Hangzhou 310012,China;China Railway Tunnel Stock Co.,Ltd.,Zhengzhou 450001,China;Department of Civil Engineering,Hangzhou City University,Hangzhou,Zhejiang 310015,China;Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,China;Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou 310015,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]浙江大学平衡建筑研究中心,浙江杭州310012 [3]浙江省城市地下空间开发工程技术研究中心,浙江杭州310058 [4]浙江大学建筑设计研究院有限公司,浙江杭州310012 [5]中铁隧道股份有限公司,河南郑州450001 [6]浙大城市学院土木工程系,浙江杭州310015 [7]浙江省城市盾构隧道安全建造与智能养护重点实验室,浙江杭州310015 [8]城市基础设施智能化浙江省工程研究中心,浙江杭州310015

出　　处：《岩土工程学报》2023年第5期1054-1062,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52178399);浙江大学平衡建筑研究中心配套资金资助项目(K横20203389C);中铁隧道股份有限公司科研课题。

摘　　要：盾构穿越上软下硬土岩复合地层时极易引起地表沉降。为探究其规律,分析了盾构开挖面在复合地层中的收敛模式,考虑了层状地层对地表位移的影响,对传统的随机介质理论进行了简化,推导了复合地层中盾构施工引起的地表位移计算公式,依托杭州环城北路—天目山路盾构隧道工程进行了地表沉降的计算和可靠性验证,搜集并分析了26组地表沉降实测数据,反分析计算得到了对应的土体损失率,并进一步分析了土体损失率的分布及取值规律。结果表明:简化方法与传统随机介质理论计算结果相近,计算曲线与实测数据相吻合;复合地层中的土体损失率分布在0.09%~2.2%,与黏性土中类似;同一工程(区段)中土体损失率随硬岩比的增大而减小,且大致呈线性相关。When the shield tunnel passes through the soil-rock composite strata,it is easy to cause surface subsidence.In order to explore its law,the convergence mode of shield excavation face in a composite stratum is analyzed.The influences of layered strata on the surface displacement are considered.The traditional stochastic medium theory is simplified.The formula for calculating the surface displacement caused by shield construction in the composite stratum is deduced.Relying on the shield tunnel project of Huancheng North Road-Tianmushan Road in Hangzhou,the calculation and reliability verification of the surface subsidence are carried out.A total of 26 groups of measured data of surface settlement in China are collected and analyzed.The corresponding soil loss ratios are obtained through the inverse analysis,and the distribution and value laws of the soil loss ratios are further analyzed.The results show that the values by the simplified method is similar to those of the traditional stochastic medium theory,and the calculated curves are consistent with the measured data.The soil loss ratios in the composite stratum are distributed between 0.09%and 2.2%,which is similar to that in the cohesive soil.In the same project(section),the soil loss ratios decrease with the increase of the hard rock ratio and are roughly linearly correlated.

关 键 词：盾构隧道 土岩复合地层 层状地层 地表沉降 土体损失率 

分 类 号：TU43[建筑科学—岩土工程]