【摘要】 南京地铁2号线一期工程TA11标包括逸仙桥站—大行宫站—新街口站,采用盾构法施工。结合工程处于软土地区、区间易产生振动液化和施工扰动等情况,指出盾构机选型、盾构机进出洞及盾构施工过程中的风险源,如始发方向失控、盾尾卡死、洞口土体坍塌、盾构机座变形等。强调在施工过程中要正确辨识风险源,并根据地质、水文和周围环境条件采取适当规避措施。更多还原

【Abstract】 TA11 bid for first stage of Nanjing Metro Line 2 is constructed with shield method,including Yixianqiao,Daxinggong and Xinjiekou stations.The shield zone locates in soft soil,so it is easy to generate vibrating liquefaction and construction disturbance.Based on the difficulties,risk sources during shield machine selection,shield entrance and construction are pointed out,including deflecting at beginning,shield tail deadlocking,soil collapse at opening as well as deformation of shield base.It is emphasized that risk sources should be identified exactly.Moreover reasonable elusion measures should be made according to geology, hydrology and surrounding environment conditions.更多还原