Research on the Evolution Mechanism of the Single-Pile Bearing Capacity of X-shaped Energy Piles Under Temperature Effect

Abstract:

To reveal the mechanism of the influence of temperature field, pile shape and soil confining pressure on the bearing capacity of energy piles, a bearing capacity evolution test of energy piles under the combined action of temperature, pile shape and confining pressure was carried out. The results show: (1) With the increase of temperature, the single-pile bearing capacity of both circular and X-shaped energy piles increases; (2) Under the conditions of 45 ℃ thermal cycling and the same pile-side soil pressure, the ultimate bearing capacity and the ultimate displacement of X-shaped piles are greater than those of circular piles. At loads of 100, 200 and 300 kPa, the bearing capacity of X-shaped piles is 176%, 134% and 125% of that of circular piles; (3) Comprehensive analysis reveals that the pile shape and the pile-side soil pressure have a significant impact on the single-pile bearing capacity of energy piles. The increase in temperature changes the characteristics of the pile-soil interface, thus significantly improving the single-pile bearing capacity. The bearing capacity advantage of X-shaped piles decreases with the increase of confining pressure.