摘要
为了研究双线盾构隧道施工对周围土体的扰动规律及盾构隧道施工时空效应,以徐州地铁3号线2期工程为背景,在现场实测的地表沉降数据基础上,采用数值计算的方法对双线盾构隧道施工进行模拟计算。首先通过地表沉降计算值与地表实测值进行对比,验证模拟的合理性。进一步建立双线盾构隧道计算模型,探究双线盾构隧道施工时地层及管片应力与位移的时空变化特性。研究结果表明:盾构隧道掘进在一定区间范围内对研究断面的地表沉降有显著影响。随着右线隧道的施工,地表沉降曲线逐步向W形曲线形态发展。隧道周围土体应力变化显著,应力最大幅值及位置随着盾构掘进而发生改变。同时,管片变形及受力特征随着盾构施工也发生显著变化。
To study the disturbance patterns of surrounding soil during the twin-line shield tunnelling and the time-space effects of shield tunnel construction,this research is based on the PhaseⅡproject of Xuzhou Metro Line 3.Utilizing field-measured surface settlement data,numerical methods were employed to simulate the construction of the twin-line shield tunnel.First,the simulated surface settlement values were compared with the observed surface settlement values to verify the rationality of the simulation.A further twin-line shield tunnel calculation model was established to explore the time-space variation characteristics of stress and displacement in the strata and segments during construction.The results indicate that the excavation of the shield tunnel significantly influences the surface settlement of the monitored section within a certain range.As the construction of the right-line tunnel progresses,the surface settlement curve gradually transforms into a W-shaped curve.The stress variation in the surrounding soil is significant,with the maximum stress amplitude and its location changing as shield excavation continues.Simultaneously,the deformation and stress characteristics of the segments also exhibit significant changes during shield construction.
作者
窦振涛
陈拓
宋倩倩
王建州
任大勇
DOU Zhentao;CHEN Tuo;SONG Qianqian;WANG Jianzhou;REN Dayong(State Key Laboratory for Geotechnical and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116;Yunlong Lake Laboratory of Deep Earth Science and Engineering,Xuzhou 221116;China Coal Tunnel Engineering Company Limited,Xuzhou 221000)
出处
《现代隧道技术》
CSCD
北大核心
2024年第S01期415-424,共10页
Modern Tunnelling Technology
基金
深地科学与工程云龙湖实验室重点攻关项目(104023006)
国家自然科学基金项目(42371134)
国家高等学校学科创新引智计划项目(B14021)
关键词
复合地层
盾构施工
时空效应
数值模拟
Composite strata
Shield construction
Temporal and spatial effect
Numerical simulation
作者简介
窦振涛(2000-),男,硕土研究生,主要从事隧道工程施工技术研究工作,E-mail:ts22030149p31@cunt.edu.cn;通讯作者:陈拓(1986-),男,工学博士,副教授,主要从事隧道与地下工程施工技术研究工作,E-mail:tuo.chen@cumt.edu.cn.
