温度驱动下X形能量桩单桩承载力演化机理研究

打开文本图片集

中图分类号：TU473 文献标识码：A

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

1， 1， 1 * （School of Civil Engineering，Suzhou Universityof Science and Technology，Suzhou，Jiangsu 215oo9，China）

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 45qC thermal cycling and the same pileside soil pressure，the ultimate bearing capacity and the ultimate displacement of X-shaped piles are greater than those of circular piles. At loads of 1OO，2OO and 300kPa ，the bearing capacity of ΔX -shaped pilesis 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.

Key words： X-shaped concrete pile； pile-soil shearing; soil arching effect; crosssectional shape； di-latancy；pile side friction resistance

随着人口数量增长和城市化进程的不断加快，能源消耗问题成为21世纪的主要挑战之一。（剩余9687字）