关键词: 基坑, 可回收预应力锚索, 内支撑

Abstract: The general guide lines for the deep excavation supporting project design should be safe, serve for the purposes, environmental friendly, apply the appropriate construction method, and more importantly, be cost effective. Based on the adjacent constraint and site geotechnical and hydrological conditions, this paper discusses the advantages and disadvantages of the three different excavation supporting methods, namely, secant piles; reuseable prestressed ground anchor with secant pile; and reinforced concrete internal support. It is concluded that the prestressed ground anchor with secant pile method is better over other two methods since it creates larger construction space so that the construction schedule could be met and it is also more cost effective than other methods.

Key words: Deep Excavations, Reuseable Prestressed Ground Anchors, Internal Support