深大基坑施工对邻近轨道交通车站安全风险研究

Safety Hazards of Deep and Large Foundation Excavation Construction on the Adjacent Rail Transit Station

以邻近苏州轨道交通3号线宝带路站的苏地2012-G-17号地块深大基坑工程为依托,基于基坑与车站的相对位置关系和轨道交通结构的特点,对深大基坑工程安全风险进行理论评估,并建立三维仿真模型,模拟分析基坑开挖与回筑的施工过程度轨道交通车站的受力变形。结果表明,深大基坑采用分区开挖,先远后近的施工方式对轨道交通车站结构的影响均在规范控制范围内,邻近轨道交通结构的变形主要发生在基坑开挖及回筑阶段,基坑开挖时遵循"开槽支撑、先撑后挖、分层开挖、严禁超挖"的原则可有效减少车站结构变形和位移,保证车站的运营安全。

This paper presents a case history of a deep foundation project of SUDI 2012-G-17 block near Baodai Road Station of Suzhou Rail Transit Line No.3.Based on the relative location of the deep excavation to the station structure and the characteristics of rail transit structure,the safety hazards of deep foundation engineering were theoretically evaluated,and a three-dimensional simulation model was established to simulate and analyzed the construction process of the foundation excavation,backfilling,and the stress deformation of rail transit station.The results show that the deep and large foundation is excavated in different areas,and the influence of the construction method of"far first and then near"on the structure of rail transit station is within the control range of the specification.The deformation of adjacent rail transit structure mainly occurs in the excavation and back construction stage of foundation pit.The principle of"slotting support,supporting first and then excavation,layered excavation and over excavation"are followed in the excavation of foundation pit,which can effectively reduce the deformation and deformation of station structure Displacement to ensure the operation safety of the station.