| 饱和粉土中相变能源桩热力响应模型试验研究 |
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| 引用本文： | 汤炀,刘干斌,郑明飞,史世雍.饱和粉土中相变能源桩热力响应模型试验研究[J].岩土力学,2022,43(Z2):282-290. |
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| 作者姓名： | 汤炀 刘干斌 郑明飞 史世雍 |
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| 作者单位： | 1. 宁波大学 岩土工程研究所，浙江 宁波 315211；2. 宁波宁大地基处理技术有限公司，浙江 宁波 315211 |
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| 基金项目： | 浙江省公益技术应用研究资助项目（No.LGF20E080012） |
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| 摘 要： | 长期非稳态的桩土热交换使得桩周土温度不断上升，产生热堆积效应，影响桩土换热效率，甚至也可使能源桩系统失效。为此，利用复合相变材料制备了相变混凝土能源桩，并在饱和粉土中开展了相变桩和普通桩热力响应模型试验，对比研究了相变桩的桩周温度分布、桩身应力?应变、桩顶位移和桩身换热效率的变化规律。结果表明：相变桩土热交换方向以径向交换为主，影响区域在2D范围以内，土体温度变化表现出滞后效应；相变桩的桩土温度变化幅度小于普通桩，具有缓解桩周土体热堆积效应的作用；在温度循环过程中，相变桩体累积了不可恢复的塑性应变。经过多次温度循环后，相变桩比普通桩的塑性累积位移更小；在夏季工况相变桩换热功率比普通桩增长约20%，冬季工况两者换热功率基本一致，随着运行时间增加，两者换热效率趋同。
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| 关 键 词： | 饱和粉土 相变材料 能源桩 热力响应 模型试验 |
| 收稿时间： | 2021-11-05 |
| 修稿时间： | 2022-02-15 |
Model test on thermal response of phase change pile in saturated silt ground |
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| TANG Yang,LIU Gan-bin,ZHENG Ming-fei,SHI Shi-yong.Model test on thermal response of phase change pile in saturated silt ground[J].Rock and Soil Mechanics,2022,43(Z2):282-290. |
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| Authors: | TANG Yang LIU Gan-bin ZHENG Ming-fei SHI Shi-yong |
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| Institution: | 1. Institute of Geotechnical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China;
2. Ningbo Ningda Foundation Treatment Technology Co., Ltd., Ningbo, Zhejiang 315211, China |
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| Abstract: | The long-term unsteady heat exchange of pile-soil makes the temperature of soil increase continuously. This phenomenon is called “heat accumulation effect” which affects the heat transfer efficiency of pile and soil, even make the energy pile system failure. In this paper, the composite phase change material was used to prepare the phase change concrete energy pile, and the thermal response model tests of the phase change pile and the ordinary pile were carried out on saturated silt. The temperature distribution around the pile, the stress and strain of the pile, the displacement of the pile top and the heat exchange efficiency of the pile were compared and anaylzed. The results show that the heat exchange direction of the phase change pile is mainly of radial exchange, and the influence area is within 2D, and the temperature change of the soil shows hysteresis effect. The change range of pile-soil temperature of phase change pile is smaller than that of ordinary pile, which can alleviate the thermal accumulation effect of soil around pile. During the temperature cycle, the phase change pile accumulates unrecoverable plastic strain. After several temperature cycles, the plastic cumulative displacement of phase change pile is smaller than that of ordinary pile. The heat transfer power of phase change pile is about 20% higher than that of ordinary pile in summer. The heat transfer power of both piles is basically the same in winter, and with the increase of operation time, the heat exchange efficiency of both piles is similar. |
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| Keywords: | saturated silt phase change material energy pile thermal response model test |
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