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In‑Situ Thermomechanical Response Test of an Energy Pile Under Temperature Loading

机译：温度荷载能量桩的原位热机械响应试验

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摘要

The energy pile is a building energy-saving technology that uses shallow geothermal energy. It has the advantages of higher heat-transfer efficiency and lower land requirements than a traditional ground source heat pump system. The thermomechanical response characteristics of an energy pile under cooling and heating conditions were studied. An in-situ test of the castin- place energy pile was used to carry out the cooling, recovery, and heating stages. Based on analysis of the stress–strain distribution characteristics and the variation law of shaft friction under the conditions of temperature load and pile restraint, the results showed that the strain distribution of the cross section at a given depth in the pile was uniform and that there was no obvious eccentric stress in the vertical pile loading. The thermally induced axial stress had a linear relationship with temperature change, and the soil around the pile and the constraint conditions at the top or toe of the pile have an impact on the location of the maximum thermally induced load. According to calculations at a ± 10 °C temperature difference, the maximum stress can reach 1.79 MPa during cooling and 1.46 MPa during heating. The variation of unit temperature in each depth range causes shaft friction to become more uniform, and shaft friction increases almost linearly with temperature.
机译：能量桩是建筑节能技术，采用浅层地热能。传热效率高的优点和比传统地源热泵系统更高的土地要求。研究了冷却和加热条件下能量桩的热机械响应特性。用于开采能量桩的原位试验用于进行冷却，回收和加热阶段。基于对温度负荷和桩束条件下应力 - 应变分布特性和轴摩擦变化定律的分析，结果表明，桩中给定深度的横截面的应变分布均匀，在那里在垂直桩载荷中没有明显的偏心应力。热感应的轴向应力具有与温度变化的线性关系，并且桩周围的土壤和桩的顶部或脚趾的约束条件对最大热感应负荷的位置产生影响。根据±10℃的计算温度差，在加热期间，最大应力可以在冷却期间达到1.79MPa和1.46MPa。每个深度范围内的单元温度的变化导致轴摩擦变得更加均匀，并且轴摩擦与温度几乎线性增加。

著录项

  • 来源
    《Arabian Journal for Science and Engineering》 |2021年第11期|10355-10364|共10页
  • 作者

    Zhi Chen; Yang Sun; Henglin Xiao; Qiang Ma; Liangguo Zhang;

  • 作者单位

    Department of Road and Bridge Engineering School of Civil Engineering and Architecture Hubei University of Technology Wuhan 430068 People’s Republic of China;

    Department of Road and Bridge Engineering School of Civil Engineering and Architecture Hubei University of Technology Wuhan 430068 People’s Republic of China;

    Department of Road and Bridge Engineering School of Civil Engineering and Architecture Hubei University of Technology Wuhan 430068 People’s Republic of China;

    Department of Road and Bridge Engineering School of Civil Engineering and Architecture Hubei University of Technology Wuhan 430068 People’s Republic of China;

    Railway Siyuan (Hubei) Engineering Supervision Consulting Co. Ltd Wuhan 430063 People’s Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Energy pile; Thermomechanical response; Constraint conditions; Shaft friction;

    机译：能量桩;热机械响应;约束条件;轴摩擦;

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