Deformation characteristics of deep excavations for metro stations in Wuxi

A database of many case histories of wall and ground movements due to deep excavations for metro stations in Wuxi Metro Line 1 is presented and discussed. The statistic analysis show that the maximum deflection of the retaining wall ranges from 0.05%H to 0.25%H, and the mean value is about 0.12%H. While the maximum deflection location ranges from 0.7H to 1.1H, and the mean value is about 0.9H. The ground settlement ranges from 0.05%H to 0.13%H, and the mean value is about 0.09%H. H is the excavation depth. Furthermore, factors affecting the wall deflection are investigated, and three of them, including excavation depth, embedded depth ratio and location of the first strut, are selected for numerical computation. Some conclusions are drawn from the artificial data.