软土地区基坑施工对邻近盾构隧道的影响分析

Influence Analysis of the Foundation Pit Construction on Adjacent Shield Tunnel in Soft Soil Area

以软土地区某邻近轨道交通盾构隧道的基坑工程为背景,通过有限元法在原设计方案下基坑施工对盾构隧道的影响程度及规律进行分析,并在此基础上提出了优化方案。结果表明,原方案基坑分区体量过大可能导致邻近隧道变形突增,通过减小分区面积并增加支护体系刚度,可减小基坑施工对邻近隧道的影响。

Based on a project of foundation pit adjacent to the rail transit shield tunnel in soft soil area, the influence degree and law of foundation pit construction on shield tunnel is analysed under the origin design by finite element method, and the optimization scheme is proposed on this basis. The results show that the large volume of the original foundation pit partition may lead to the sudden increase of adjacent tunnel deformation, however, the influence of foundation pit construction on adjacent tunnels can be decreased by reducing the partition area and increasing the stiffness of the supporting system.