考虑槽壁及坑底联合加固的上海地铁车站基坑变形特性分析

Analysis of Deformation Characteristics of Subway Excavation in Shanghai Considering Reinforcement of Groove Wall and Pit Bottom

以上海轨道交通14号线嘉怡路站的基坑工程为例,采用有限元法对其开挖过程进行了数值模拟,并结合现场监测数据对比分析,研究了地连墙槽壁及坑底土体联合加固对基坑变形特性的影响。结果表明:采用TRD工法墙和三轴搅拌桩进行的槽壁及坑底联合加固对基坑周围的地表沉降、坑底隆起和地连墙的侧向变形起到了很好的控制作用,研究结果为上海地铁车站基坑工程的设计和施工提供了参考。

FEM was used to simulate the excavation of Jiayi Road Station of Shanghai Metro Line 14,and thus the influence of combined reinforcement of groove wall and pit bottom on the deformation of subway excavation was studied,with the analysis of field monitoring data.The results show that the combined reinforcement of groove wall and pit bottom with TRD and triaxial mixing pile can effectively control the ground settlement,bottom heave and the lateral displacement of diaphragm wall,which may provide a reference for the design and construction of subway excavation in Shanghai.