基坑非常规分块对盾构下穿的风险控制研究

Research on the Control of the Risk of Unconventional Blocking of Foundation Pit on Shield Undercrossing

针对某地下通道与地铁线路合建的一个基坑工程,论文研究该基坑由于先期从开挖到结构回筑在时间上存在先后、空间上存在连接问题,南北两块结构之间产生的不均匀沉降。论文在此基础上进行盾构穿越,用有限元方法对地铁盾构上下行推进施工过程中分别穿越南、北结构过程进行数值模拟计算,通过数据分析评价远期地铁施工对基坑的影响,再通过沉降观测数据进行验证,以期为类似穿越工程提供有效借鉴。

Aiming at a foundation pit engineering jointly constructed by an underground passage and a subway line,this paper studies the uneven settlement between the north and south structures of this foundation pit due to the sequential and spatial connection problems from excavation to structure back construction in time in the first phase.Based on this,the paper carries out shield undercrossing,uses the finite element method to carry out numerical simulation calculation on the process of crossing the south and north structures respectively during the upward and downward advancement construction of the subway shield construction,evaluates the impact of long-term subway construction on the foundation pit through data analysis,and then verifies it through settlement observation data,so as to provide effective reference for the next similar crossing engineering.