关键词: 预留土台, 盆式开挖, 逆作开挖, 地铁车站

Abstract: This paper presents a case history of a very deep excavation near an active metro station in Shenzhen. The excavation supporting method design combined with the developer’s requirements for the construction schedule and cost of the project. Both design approaches and construction techniques of top-down excavation earthwork are provided in the paper. The soil in front of the excavated area that near the adjacent metro station was excavated to the floor elevation of the minus second story and reserve it until the completion of the nearby main structure. Then the top-down construction was used to complete the remaining soil removal. Combining results from the finite element analysis by using Midas/GTS NX software and the monitoring data during the construction, it is concluded that the excavation of the earthwork after removing a portion of overburden between the excavated area and the subway station is feasible. This project can provide guidance or reference for similar projects near subway stations.

Key words: Reserved Soil Platform, Basin Excavation, Reverse Excavation, Subway Station