Abstract: This paper presents a case study for selecting type of braced excavation and water cutoff technique in high permeable soil in karst area. This specific project suggests that the quality and effectiveness of a seepage cutoff wall and the safety of the excavation can be improved at the design phase by improving cutoff wall design and increasing stability at bottom of the excavation.   

Key words: Karst Area, Sand, Braced Excavation, Seepage, Cutoff