富水软弱地层中麻花型盾构隧道群施工关键技术

Key Construction Technologies for Overlapping Twisted Shield-bored Tunnels in Weak Water-rich Strata

为解决富水软弱地层中上下重叠、麻花交叉型盾构隧道群施工的关键技术难题,根据工程地质条件、周边工作环境和4条隧道空间位置关系进行理论分析,确定隧道群最优施工顺序,并通过信息化监测手段进行验证控制。通过控制施工时间,采用自行式智能支撑台车,注浆加固技术等措施确保了重叠、交叉段隧道施工安全;采用注浆预加固和克泥效技术保证了周边建筑物的安全。上下重叠、麻花交叉型隧道群施工技术对于类似空间交叠、始发/接收风险较大隧道、近距离下穿重要建构筑隧道的施工有较强的指导和借鉴意义。

The project under study is an overlapping twisted shield-bored tunnels in weak water-rich strata. The purpose of the study is to solve the key technological problems in the construction of the project. The optimal construction sequence of the overlapping twisted shield tunnels is determined according to the engineering geological conditions, the surrounding working environment, and theoretical analysis on the spatial relationship of the four tunnels, and verification control are carried out via monitoring means. The tunnel construction is properly timed, smart self-propelled movable support jumbo is adopted, and grouting reinforcement technology is used to ensure the construction safety of the overlapping twisted shield-bored tunnels. The grouting pre-reinforcement technology and the clay shock technology are adopted to ensure the safety of the surrounding buildings. The technologies for the construction of the overlapping twisted shield-bored tunnels described in this paper is of great significance for the construction of similar overlapping tunnels with high shield launching/receiving risks and crossing under important structures with small clearance.