Numerical Simulation Analysis of the Influence of Recharging Wells on the Settlement of Buildings Surrounding Deep Foundation Pits

In the process of excavating the deep pit, due to the change in groundwater level, will inevitably cause uneven settlement of the surrounding buildings. To prevent such uneven settlement and to protect the safety of surrounding buildings, recharging methods are often used in the project. In this paper, with the engineering example, the finite element software is used to simulate the deep excavation dewatering and recharge process, and the influence of different recharge volumes, different lengths of recharge wells, and recharge wells with different positions on the settlement of buildings is studied. The results show that the greater the amount of recharge, the better the control effect on building settlement, but the excessive amount of recharge will lead to the uplift of the surrounding soil of the building. With the same amount of recharge, the longer the length of the recharge well, the smaller the settlement of the building. The recharging well can restore the water level lost at the building due to dewatering. The larger the amount of recharge, the longer the length of the recharging well and the more the water level is restored. When the recharging well is between the building and the dewatering well, the settlement control effect of the recharging well is the best.