Field tests on thermo-mechanical response and bearing capacity 
of PHC energy pile under cooling-heating cyclic temperature

REN Lian-wei; REN Jun-yang; KONG Gang-qiang; LIU Han-long

doi:10.16285/j.rsm.2020.0754

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Field tests on thermo-mechanical response and bearing capacity of PHC energy pile under cooling-heating cyclic temperature

更新时间：2026-06-25

- Field tests on thermo-mechanical response and bearing capacity of PHC energy pile under cooling-heating cyclic temperature
- Vol. 42, Issue 2, Pages: 529-536(2021)
- 作者机构：
  
  1. 河南理工大学土木工程学院,河南,焦作,454000
  2. 河海大学岩土力学与堤坝工程教育部重点试验室,南京,210098
  3. 重庆大学土木工程学院,重庆,400045
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2020.0754
  CLC： TU473.1
- Online First：09 February 2021，
  
  Published：2021
- 稿件说明：
移动端阅览
REN Lian-wei, REN Jun-yang, KONG Gang-qiang, et al. Field tests on thermo-mechanical response and bearing capacity of PHC energy pile under cooling-heating cyclic temperature[J]. 2021, 42(2): 529-536.
DOI：

REN Lian-wei, REN Jun-yang, KONG Gang-qiang, et al. Field tests on thermo-mechanical response and bearing capacity of PHC energy pile under cooling-heating cyclic temperature[J]. 2021, 42(2): 529-536. DOI： 10.16285/j.rsm.2020.0754.

摘要

能量桩是一种兼具常规承载性能和地源热泵热交换器双重功能的建筑节能新技术。依托河南周口师范学院综合体育馆桩基工程项目，开展冷热循环温度作用下PHC能量桩的热力响应特性及承载性能现场试验。实测了不同流速下桩身温度与应变的发展规律，初步探讨了热致应力、桩侧摩阻力及换热性能等变化规律。研究结果表明：此试验条件下，冷热循环下PHC能量桩的桩身热致应力沿桩深分布不均，桩身上部出现负摩阻力；夏季或冬季模式下桩身最大热致应力与温差之间的倍数关系为212和115；提出了一个考虑温度作用效应的桩-土摩擦系数的计算公式，并基于此修正了PHC能量桩承载力计算方法，计算结果与现场试验结果吻合较好。

Abstract

Energy pile is a new building energy-saving technology

which has both functions of the bearing performance and the ground source heat pump heat exchanger. Based on the pile foundation engineering project of Zhoukou Normal University gymnasium in Henan province

field tests on the thermo-mechanical response and bearing capacity of PHC energy pile under cooling-heating cyclic temperature are carried out. The temperature and the strain of PHC energy pile are measured. The temperature-induced stress

side resistance

and heat exchange performance are analyzed and discussed. Test results show that: the distribution of the temperature-induced stress along pile depth varies greatly under cooling-heating cyclic temperature in this study. There is some negative shaft friction resistance developed in the upper part of the pile. The multiple relationship between the maximum thermal stress and temperature difference is 212 or 115 under summer or winter mode. Finally

a calculation formula of pile-soil friction coefficient considering temperature effect is proposed. Using this formula

the calculation method of bearing capacity of PHC energy pile is modified. The calculation results are in good agreement with field test results.

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