不同桩体温度下能量管桩承载力特性模型试验研究

能量管桩是在传统ＰＣＣ桩或预应力管桩基础上研发的一种新型的桩埋管形式能量桩技术，埋管方便、热传导效率高；然而，针对不同温度下该新型能量桩承载力特性的研究相对较少。基于模型试验方法，在桩内预埋导热管、利用导热管中的循环导热液体对桩体施加温度，续而开展温度影响下能量管桩的静载荷试验，测得不同温度影响下能量管桩的荷载－位移关系曲线、桩身应力－应变关系曲线等变化规律，并对能量管桩在实际运行过程中的承载特性与受力机理进行了初步讨论与分析。试验结果表明，能量管桩在饱和砂土中的竖向承载力随着桩体温度的升高而增大，反之，则减小；桩体温度每升高１℃，能量管桩桩基极限承载力近似提高１．５％。

Model Test on the Bearing Capacity of Energy Pipe Pile Influenced by Temperature

Energy pipe pile is a new type of pile-buried pipe. Energy pile technology is developed on the basis of traditional PCC piles or pre-stressed pipe piles. It is convenient to bury pipes and has high heat transfer efficiency, however, according to the bearing capacity characteristics of the new energy pile at different temperatures. Currently there are few researches in this area. In this paper, based on the model test the heat pipe is first embedded in the pile, and the circulating heat-conducting liquid in the heat pipe is used to apply temperature to the pile. Then, the static load test of the energy pipe pile under the influence of temperature is carried out. The load-displacement relationship curve, the stress-strain relationship curve of the pile body, and other changes are discussed. The bearing characteristics and force mechanism of the energy pipe pile during actual operation are summarized and analyzed. The test results show that the vertical bearing capacity of energy pipe piles in saturated sand increases with the temperature of the piles, and decreases with the increase of the temperature;for every 1℃ increase in the temperature of the piles, the bearing capacity of the energy pipe pile foundation can be increased by approximately 1.5%.