Model Test of Static Drilling and Implanted Energy Pile Considering the Influence of Groundwater

In order to study the influence of groundwater flow on the bearing characteristics of static drilling deep-rooted energy pile in coastal area, a model test system of static drilling deep-rooted energy pile in 1.2 m thick soft clay interlaced with sand model ground was designed, so as to test and analyze the temperature, pore pressure, displacement and stress of pile-soil system with or without water flow. The results showed that groundwater flow reduced the temperature variation of pile, ranging from 6.39% to 34.15%. The temperature change of the downstream soil is obviously higher than that of the upstream soil, which is beneficial to reduce the thermal and cold accumulation effect of the soil around the pile. The water flow approximately reduces the hot pore pressure by 11% and the negative pressure by 20% in the surrounding soil, and the cumulative settlement of pile top is approximately reduced by 1/3. The tension stress of pile body caused by temperature is also reduced when groundwater flows. With the increase of load, the influence of water flow on friction decreases. Under the condition of underground flow, the maximum negative friction decreases under the rising and cooling conditions, which is conducive to the long-term work of static drilling of energy pile.