Control and prevent land subsidence caused by foundation pit dewatering in a coastal lowland megacity: indicator definition, numerical simulation, and regression analysis

Land subsidence has to be controlled under global climate change and sea level rising for coastal megacities. caused by lowering groundwater during underground excavation become a dominant influence factor land urbanization city renewal. How manage the induced foundation pit dewatering (FPD) on an urban scale was urgent. Shanghai selected as research background. A drawdown double control (SDDC) partition established. The position of three times depth (3H) horizontally away from boundary in plane defined between settlement. 3H (LS-3H) (GD-3H) were evaluating controlling indicators. An FPD conceptual model summarized estimating investigating information numerical simulations performed. total 6540 scenarios simulated LS-3H GD-3H. Multi-factor regression analysis conducted obtain relations GD-3H shape, area, depth, curtain basis simulations. models can used estimate compared with threshold specified prevention (LSPC) law, which provide reference similar cases.