冬季工况多次温度循环下微型钢管桩群桩热力响应特性现场试验

任连伟; 徐健; 孔纲强; 刘汉龙

doi:10.11779/CJGE201911010

冬季工况多次温度循环下微型钢管桩群桩热力响应特性现场试验 English Version

任连伟¹,
徐健¹,
孔纲强^2, ,,
刘汉龙^2,3

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,江苏南京 210024;
3. 重庆大学土木工程学院,重庆 400045

基金项目: 国家自然科学基金项目（51778212）

详细信息

作者简介:
任连伟(1980— ),男,河南周口人,博士,副教授,主要从事地基基础相关的教学与科研工作。E-mail: renhpu@163.com。

通讯作者:
孔纲强，E-mail：gqkong1@163.com

中图分类号: TU470
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- 文章访问数: 264
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出版历程
- 收稿日期: 2018-11-29
- 发布日期: 2019-11-24

Field tests on thermal response characteristics of micro steel pile group under multiple temperature cycles in winter conditions

1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. Key Laboratory of Geomechanics and Embankment Engineering, Ministry of Education, Hohai University, Nanjing 210024, China;
3. College of Civil Engineering, Chongqing University, Chongqing 400045, China

摘要

摘要: 能量桩技术具有支撑上部结构和浅层地热能换热器双重作用;作为一种节能减排新技术,近年来获得了一定的发展。依托微型钢管桩加固既有基础托换工程,开展冬季工况多次温度循环下微型钢管桩群桩的热力响应现场试验;实测不同间歇时长情况下桩身温度与应力等变化规律,探讨不同运行模式下的桩基换热性能系数（C_OP,coefficient of performance）。试验结果表明：文中试验条件下,桩身附加温度应力随循环次数增加而增大,且随间歇时间的延长而减小;桩基C_OP随循环次数增加而减小,且随间歇时间的延长而增大;附加拉应力未超过设计控制范围、不会导致桩体破坏。
- 微型钢管桩 /
- 能量桩 /
- 多次温度循环 /
- 热力响应 /
- 现场试验
Abstract: The energy pile technology has dual functions of supporting superstructure and acting as shallow geothermal heat exchanger. As an energy-saving and emission-reduction technology, it has obtained certain development in recent years. Relying on the micro steel piles to reinforce the existing foundation underpinning project, the field tests on thermal response of the micro steel group piles under multiple temperature cycles are carried out. The variation of pile temperature and pile stress under different intermittent time is measured. The coefficients of performance (C_OP) of piles are discussed and analyzed. It is shown that the additional thermal stress of piles increases with the increasing cycling times, and the increase ratio decreases with the interval time; the C_OP of piles decreases with the increasing cycling times, and the decrease ratio decreases with the interval time. The values of the additional tensile stress does not exceed the design control range, which will not cause the damage of the pile.
- micro steel pile /
- energy pile /
- multiple temperature cycle /
- thermal response /
- field test

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参考文献(20)

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