Coupling analysis of stress field and seepage field in foundation pit dewatering and optimization design of reinjection

In deep excavation projects in confined strata, due to the high water content and high pressure head of the strata, problems such as excessive horizontal displacement of the retaining structure and sudden surge at the bottom of the pit often occur during the excavation process. To solve these problems, it is usually necessary to carry out dewatering construction. However, precipitation construction can cause serious damage to groundwater resources and the surrounding environment. Therefore, in order to protect groundwater resources and the environment, it is necessary to carry out recharge construction after precipitation construction. This article is based on the coupling analysis of stress field and seepage field in foundation pit dewatering. By studying the interaction between pumping wells and buildings in foundation pit engineering, the idea of optimizing the design of foundation pit recharge is proposed. Based on the coupling analysis results of the stress field and seepage field in the foundation pit dewatering, the reasonable position and water volume of the pumping well can be determined to achieve the effect of foundation pit dewatering. At the same time, based on the decrease in groundwater level of the building, the start time and amount of reinjection water can be determined to avoid wasting water resources and increasing the burden on the pumping well due to premature reinjection. By optimizing the design of reasonable foundation pit recharge, water level changes in the project can be better controlled, settlement problems can be avoided, and the safety and efficiency of the project can be improved.