Predicted Calculating Method of Surface Subsidence Caused by Caisson Construction in Soft Soil

Open caisson has been widely used in the construction of underground space in soft soil area, but the distribution of surface subsidence caused by its settlement process is not clear and there is no prediction method. Based on the background of a caisson project in Shanghai area and the calculation parameters of HSS model of typical soil layer in Shanghai, this paper simulates the sinking of circular caisson by finite difference method. Based on the systematic analysis and normalization study of 96 numerical results, a fast prediction method of surface settlement caused by caisson construction is put forward. This method can comprehensively consider the influence of sinking diameter B, sinking depth H and plug height h in the well on surface settlement. Finally, the ground settlement of 5 projects is predicted by this calculation method and compared with the measured data. The result shows that this method can well predict the ground settlement caused by the construction of caisson in soft soil area, and it can provide an effective method for quickly evaluating the environmental effects of caisson construction.