软土地区市域快速轨道交通大直径盾构隧道的横断面变形特征及其控制限值  

Cross-sectional Deformation Characteristics and Control Limits of Large-diameter Shield Tunnel in Urban Rapid Rail Transit in Soft Soil Area

作　　者：顾锋 GU Feng(Guangzhou Metro Design and Research Institute Co.,Ltd.,510010,Guangzhou,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010

出　　处：《城市轨道交通研究》2022年第8期97-102,共6页Urban Mass Transit

摘　　要：为研究软土地区大直径盾构隧道横断面变形对隧道结构安全的影响,以已运营的广州南沙地区深厚软基区段速度160 km/h市域快速轨道交通(以下简为“市域快线”)大直径盾构隧道工程为例,利用数值模拟方法研究了线路运营期间加、卸载引起的隧道横断面变形与结构性态的发展规律。结果表明:隧道横断面变形与接缝最大张开量、接头螺栓应力和混凝土结构损伤存在较高的相关性。建立了以隧道拱腰直径变化量为控制指标的市域快线盾构隧道横断面变形安全等级,分为Ⅰ(正常)、Ⅱ(退化)、Ⅲ(劣化)、Ⅳ(恶化)、Ⅴ(危险)等5个等级,并针对各安全等级状态提出了相应的处理措施。In order to study the influence of cross-sectional deformation of large-diameter shield tunnel on the safety of tunnel structure in soft soil area,the development law of cross-sectional deformation and structural state caused by loading and unloading of large-diameter shield tunnel in Nansha deep and soft foundation section of Guangzhou 160 km/h operating urban rapid rail transit is studied by numerical simulation method.Results show that there is a high correlation between the cross-sectional deformation of the tunnel and the maximum opening of the joint,the stress of the joint bolt,and the damage of the concrete structure.The variation of tunnel arch waist diameter is taken as the control index,and the safety level of cross-sectional deformation of shield tunnel in urban rapid rail transit is established,which is divided into five levels:Ⅰ(normal),Ⅱ(degradation),Ⅲ(deterioration),Ⅳ(deterioration worsening),Ⅴ(danger).Corresponding treatment measures are put forward.

关 键 词：市域快速轨道交通 大直径盾构隧道 横断面变形 控制指标 软土地区 

分 类 号：U456.31[建筑科学—桥梁与隧道工程] U455.43[交通运输工程—道路与铁道工程]