长江科学院院报 ›› 2017, Vol. 34 ›› Issue (8): 153-158.DOI: 10.11988/ckyyb.20160160

• 科技简报 • 上一篇    

螺旋型埋管能源桩桩内温度场分布特征及其影响因素分析

赵海丰1, 2, 桂树强1, 李强1, 贾甲1   

  1. 1.长江三峡勘测研究院有限公司(武汉),武汉 430074;
    2.中国地质大学(武汉) 工程学院,武汉 430074
  • 收稿日期:2016-02-09 修回日期:2016-04-07 出版日期:2017-08-01 发布日期:2017-08-18
  • 作者简介:赵海丰(1983-),男,湖北武汉人,高级工程师,博士,主要从事浅层地热能开发利用及岩土工程设计、科研工作,(电话)13163239121(电子信箱)zhaohaifeng83@163.com。

Temperature Field Distribution in Energy Pile with Buried Spiral Pipe: Characteristics and Influence Factors

ZHAO Hai-feng1, 2, GUI Shu-qiang1, LI Qiang1, JIA Jia1   

  1. 1.Three Gorges Geotechnical Surveying Co., Ltd., Wuhan 430074, China;
    2.Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
  • Received:2016-02-09 Revised:2016-04-07 Online:2017-08-01 Published:2017-08-18
  • Supported by:
    国家自然科学基金项目(41502238); 中央高校杰出人才培育基金项目(CUGL150819)

摘要: 针对能源桩桩内温度场分布特征开展了现场原位试验,实测获得了能源桩换热过程中的桩壁和桩心温度,以此为基础结合数值模拟分析了能源桩的桩内温度场分布特征及其影响因素。分析结果表明:能源桩桩内温度温升规律与地埋管进出口温度变化规律一致,桩内温度场主要受地埋管进出口温度控制;能源桩制热(冷)时,以地埋管为起点,桩内温度远离地埋管呈抛物线下降(上升);影响能源桩桩内温度场分布特征的主要因素为回填材料导热系数和桩径,导热系数越大,相同制热时间时的桩内温度越高,且桩心温度随导热系数的增加近似呈线性上升;桩径越大,相同制热时间时的桩内温度越低,桩内温度随桩径的增加近似呈等比例下降。该研究成果可为能源桩的推广应用提供参考。

关键词: 螺旋型埋管能源桩, 温度场分布特征, 影响因素分析, 原位试验, 数值模拟

Abstract: In the present research, the characteristics and influence factors of temperature field distribution in energy piles with buried spiral pipe were investigated by numerical means based on field prototype tests on temperature field distribution in energy piles as well as measured values of temperatures at pile wall and pile core during heat exchange. Results reveal that the regularity of temperature rise in energy pile is consistent with temperature variation at the inlet and outlet of buried pipe, which suggest that temperature field in energy pile is mainly dominated by temperature at the inlet and outlet of buried pipe. When energy pile is heated or refrigerated, temperature in pile declines or rises in a parabola along the way of the buried pipe. Moreover, the conductivity coefficient of backfill material and the pile diameter are two main factors affecting the temperature field distribution in energy pile. As conductivity coefficient increases, the temperature in pile rises at given heat durations; and in particular, temperature at the core of pile rises linearly. As pile diameter increases, the temperature in pile declines in equal proportion at given heat durations. The research results could be taken as reference for the promotion of energy piles.

Key words: energy pile with buried spiral pipe, temperature field distribution, influence factors, prototype test, numerical simulation

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