工作荷载下温度循环对桩基变形与应力的影响分析

目前针对工作荷载下温度循环对桩基承载力特性的研究相对较少，基于室内模型试验方法，对饱和砂土中工作荷载下桩体在多次冷热循环作用时的承载特性和传热特性进行研究，测得温度循环作用下桩体和桩周土体温度、桩周水平土压力、桩体应变以及桩顶位移随时间的变化规律。试验结果表明，施加温度循环作用后桩体及桩周土体温度变化不大，桩周水平土压力也能基本恢复到初值，但在桩体内部则会产生较少残余应变，桩顶下沉并随着循环次数的增加不断累积，从而影响结构的整体承载能力。

Influence of circular temperature on the strain and stress of energy piles under a working load

The studies focused on the thermal-mechanical behavior under cycle thermal load with a working load are relative little. Based on the laboratory model test method, this study aims to study the heat transfer performance and bearing characteristics of the pile under working load when cycle thermal load is applied. The temperature of pile and surrounding soil, horizontal soil pressure, thermal strain and pile head settlement are measured. The results show that the temperature of pile and surrounding soil varies little; and horizontal soil pressure recovers nearly to initial value after cycling. Moreover, it is also shown that a little residual strain will be produced in the pile, and the settlement will accumulate as the cycle thermal load is applied, so as to influence the bearing characteristics of structure.