摘要
软土地层中小净距重叠隧道盾构施工是近距离重叠盾构隧道建设中典型的难题。以杭州市地铁5号线五常车辆基地东出入段线重叠盾构隧道为依托工程,通过数值分析和现场测试方法对软土地层小净距重叠隧道盾构施工相互扰动影响进行研究。研究结果表明:软土地层小净距重叠隧道采用"先下后上"施工顺序,在地表沉降、地层位移和结构变形等产生的影响均小于采用"先上后下"施工顺序;二次注浆加固及移动支撑台车措施,可有效控制重叠隧道结构变形及地表沉降;采用"先下后上"的施工顺序进行重叠段隧道的施工,施工难度相对较小,施工质量更容易控制。
The construction of overlapping shield tunnels with small net distance is a typical problem,especially in soft soil layer.In order to solve the construction problem of the overlapping shield tunnel of Wuchang Vehicle Base in Hangzhou Metro Line 5,the mutual disturbance influence of construction sequence on the deformation of the soil and the structure of overlapping tunnels was studied using the methods of numerical analysis and field monitoring.The result showed that the construction sequence of lower tunnel ahead of upper tunnel was better than that of upper tunnel ahead of lower tunnel.The influence of the former on the deformation of the soil and the structure of overlapping tunnels was less than the latter;secondary grouting reinforcement and moving support trolley could effectively reduce the deformation of the soil and tunnels.The construction sequence of lower tunnel ahead of upper tunnel was used to carry out the construction of overlapping tunnels.
作者
周静增
王建华
闫自海
王建望
张强
ZHOU Jingzeng;WANG Jianhua;YAN Zihai;WANG Jianwang;ZHANG Qiang(Hangzhou Quality and Safety Supervision Station of Construction Engineering,Hangzhou 310005,Zhejiang,China;Power China Huadong Engineering Co.,Ltd.,Hangzhou 311122,Zhejiang,China;Zhejiang Intelligent Rail Transit Engineering Technology Research Center,Hangzhou 311122,Zhejiang,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510630,Guangdong,China)
出处
《隧道与地下工程灾害防治》
2021年第2期61-68,共8页
Hazard Control in Tunnelling and Underground Engineering
基金
浙江省建设科学资助项目(2018K018)。
关键词
盾构隧道
地铁穿越
接近施工
影响分析
变形控制
shield tunnel
subway crossing
approach construction
impact analysis
deformation control
