Design and practice of large-scale deep excavations in deep soft soils

An excavation located in 1st terrace near Yangtze River in Wuhan City is taken as an example. The design concept of large scale being divided into small, segment design, severity and combined bracing is put forward. According to engineering geological conditions and construction deployment, different retaining structures such as pile-strut, double-row piles and reinforcement in passive zone are combined reasonably both in the plane and space, respectively. It achieves the convenience of earthwork and basement construction under the premise of safety and economy of supporting structures and surrounding environment. It may provide a good reference for other similar projects.