With the development of large‐scale water diversion projects behind reservoir dams, caisson engineering is increasingly being adopted for pumping stations in such settings to ensure engineering safety under complex geological conditions. Based on three‐dimensional seepage theory of porous media and taking the construction dewatering of the Zhuchong Large Pump Station caisson project in Henan as a case study, this study analyzes the evolution patterns of the three‐dimensional seepage field around the Zhuchong Large Pump Station caisson pit project in Henan due to dewatering and investigates the subsidence characters induced by different dewatering depths during the caisson sinking process. The research results show that the groundwater drawdown increases corresponding with the depth of the caisson sinking. Owing to the notable waterproofing effect provided by the upper concrete walls of the caisson, the range of groundwater influence is smaller compared to open excavation dewatering. During the sinking process, dewatering‐induced ground subsidence accumulates progressively. Moreover, the maximum subsidence observed under dewatering conditions is less than what was predicted when ignoring the water‐blocking effect of the caisson wall.
Cao et al. (Thu,) studied this question.