Abstract: In the deep excavation practice in the urban area of Suzhou City, the slightly artesian silt lenses are frequently encountered. The success of the dewatering in this layer is critical to the smoothness of the entire deep excavation project. This paper resents a case study of the deep excavation project. The material components, water bearing characteristics and the selection of the dewatering scheme are discussed. The use of small well point groups is a feasible and cost effective solution in these soils.   

Key words: Deep Excavations, Silt Lenses, Well Points, Suzhou Areas