【作者】 王伟；

【导师】 赵延喜；

【作者基本信息】 安徽理工大学 ， 建筑与土木工程， 2020， 硕士

【摘要】 近年来,我国城市规模的不断扩大和城市人口的快速增长,使得城市轨道交通建设进入了前所未有的发展时期,而地铁作为城市轨道交通的重要组成部分,在城市轨道交通中的比重越来越大。城市轨道交通网络的不断完善,必将引起地铁线路出现空间交叉现象,新建地铁隧道势必对既有地铁隧道产生影响,如新隧道盾构施工会扰动周围土体,使相邻既有隧道结构发生变形,危及既有隧道的安全等。本文以常州地铁2号线青洋路站～入段线区间盾构上跨既有正线隧道为背景,通过分析新建隧道与既有隧道间的作用机理,结合有限元数值模拟、现场监测等手段,对既有正线隧道的变形进行讨论和研究,并提出相应的控制措施。本文将从以下几个方面展开研究:(1)分析新建上跨隧道施工引起的土体扰动以及对既有隧道的作用机理,阐明夹层土在近接工程中的重要作用;(2)结合常州地铁2号线某上跨区间项目工程,针对盾构施工给既有地铁隧道所造成的影响进行现场监控测量,分析新建地铁隧道在盾构施工过程中的地表沉降规律;(3)根据实际工程资料,建立本工程的MIDAS有限元模型,对新建隧道盾构上跨既有隧道的施工过程进行数值模拟,通过数值模拟结果与实测数据的比较,验证有限元模型的可靠性;(4)基于现场实测数据及数值模拟结果,归纳总结了在隧道盾构施工过程中对新建隧道结构及既有隧道结构的保护措施,包括建立风险管理体系、施工风险控制措施、既有隧道加固措施、扰动区土体加固措施及现场监测措施。图40表12参50更多还原

【Abstract】 In recent years,the continuous expansion of the scale of my country’s cities and the rapid growth of urban population have brought urban rail transit construction into an unprecedented period of development.As an important part of urban rail transit,subway has an increasing proportion in urban rail transit.The continuous improvement of the urban rail transit network will inevitably cause the phenomenon of spatial intersection of subway lines,and the new subway tunnel will inevitably have an impact on the existing subway tunnel.For example,the shield construction of the new tunnel will disturb the surrounding soil,deform the adjacent existing tunnel structure,and endanger the safety of the existing tunnel.This paper based on the background of Qingyang Road Station～Entry Line Interval shield cross over existing main line of Changzhou Rail Transit Line 2,the mechanism of the interaction between the newly built tunnel and the existing tunnel is analyzed,combined with finite element numerical simulation and field monitoring,the deformation of existing tunnel is discussed and studied,and the corresponding control measures are put forward.The main research contents include the following aspects:(1)This paper analyzes the soil disturbance caused by the construction of the new upper-span tunnel and the mechanism of the existing tunnel,and clarify the important role of interbedded soil in proximity engineering;(2)Combined with the project of an upper span section of Changzhou Metro Line 2,conduct on-site monitoring and measurement of the impact of shield construction on existing subway tunnels,and analyze the law of surface settlement of newly-built subway tunnels during shield construction;(3)According to the actual engineering data,establish the MIDAS finite element model of this project,carry out numerical simulation of the construction process of the newly built tunnel shield over the existing tunnel,and verify the reliability of the finite element model by comparing the results of the numerical simulation with the measured data;(4)Based on the field measured data and numerical simulation results,the protective measures for the new tunnel structure and the existing tunnel structure during the tunnel shield construction process are summarized,including the establishment of risk management system,construction risk control measures,existing tunnel reinforcement measures,soil reinforcement measures and on-site monitoring measures.Figure 40 table 12 reference 50更多还原