Study on the influence of groundwater recharge on pile foundation of high-speed railway bridge

Under the action of deep groundwater recharge, the ground settlement can be moderated, which indicates that deep groundwater recharge can not only effectively control the ground settlement, but also cause the expansion of deep soil, thus leading to the uplift of the ground. Based on this, this paper uses the fluid-solid coupling method to control groundwater recharge flow to analyze the long-term settlement characteristics of typical elevated pile foundation on the North China Plain under the action of recharge. Numerical analysis shows that the elevated pile foundation has a change of uplift and subsidence under the coupling action of upper load and deep recharge, and the uplift becomes more obvious with the increase of the depth of recharge point. However, the increase of horizontal displacement will also lead to the opposite result, and the final settlement is determined by both of them. In addition, it is also affected by the flow of recharge load. The greater the flow of recharge load, the greater the uplift of elevated pile foundation. The results can provide reference for the settlement prediction of pile foundation.