[1]刘浩,顾凯,张博,等.简化线热源对ATRT计算土体导热系数的影响——数值模拟研究[J].华东地质,2021,42(02):157-166.[doi:10.16788/j.hddz.32-1865/P.2021.02.004]
　LIU Hao,GU Kai,ZHANG Bo,et al.The influence of simplified line source on ATRT’s calculation of soil thermal conductivity——Numerical simulation research[J].East China Geology,2021,42(02):157-166.[doi:10.16788/j.hddz.32-1865/P.2021.02.004]
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简化线热源对ATRT计算土体导热系数的影响——数值模拟研究()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
42
期数:
2021年02期
页码:
157-166
栏目:
理论与探讨
出版日期:
2021-08-18

文章信息/Info

Title:
The influence of simplified line source on ATRT’s calculation of soil thermal conductivity——Numerical simulation research
作者:
刘浩1;  顾凯1;  张博1;  魏壮1;  罗淇1;  施斌1;  苏晶文2
1. 南京大学地球科学与工程学院, 江苏 南京 210023;
2. 中国地质调查局南京地质调查中心, 江苏 南京 210016
Author(s):
LIU Hao1;  GU Kai1;  ZHANG Bo1;  WEI Zhuang1;  LUO Qi1;  SHI Bin1;  SU Jingwen2
1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;
2. Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
关键词:
热响应测试; ATRT; 数值模拟; 简化热源计算
Keywords:
thermal response test; ATRT; numerical simulation; simplified heat source in calculation
分类号:
P641
DOI:
10.16788/j.hddz.32-1865/P.2021.02.004
摘要:
不同深度土体的导热系数是精细评价浅层地热能的关键参数，基于内加热光缆的热响应测试（ATRT）是获取原位土体分布式导热系数的有效方式之一。利用有限元数值模拟软件ComsolMultiphysics，建立了二维有限元多孔介质传热模型，探究了U型布设内加热光缆条件下内加热光缆间距对实施ATRT计算导热系数的影响。结果表明：ATRT的热响应过程可以分为3个阶段，分别是光缆影响阶段、回填料影响阶段和土体影响阶段。U型布设光缆会增加土体影响阶段达到稳定时的加热时间，不利于提高ATRT计算导热系数的效率；由于简化计算的影响，U型光缆测试结果计算所得的导热系数在加热初期出现了明显高于土体导热系数的峰值，随着加热时间的增加，U型光缆布设条件下温升速率逐渐接近理想线热源温升速率，计算结果也越接近于真实值，缩小间距可以加速这个过程；随着间距增大，将误差控制在10%以内的建议加热时间将快速增大，故在实际工况中为了提高测试效率应尽量减小U型光缆的布设间距。
Abstract:
The thermal conductivity of soil at different depths is a key parameter for the evaluation of shallow geothermal energy. A thermal response test based on the actively heated optical cable (ATRT) is one of the effective ways to obtain the in-situ distributed thermal conductivity. Compared with traditional thermal response test (TRT) and distributed thermal response test (DTRT), ATRT has better test efficiency. One of the key issues that determines the error and the effect of ATRT is how to effectively lay a heat source that satisfies the assumption in the line source model. Using the finite element numerical simulation software ComsolMultiphysics, a two-dimensional finite element heat transfer model of porous media was established, and we explored the influence of U-shaped internal heating cable’s spacing on the calculated thermal conductivity. The results show that the thermal response process of ATRT can be divided into three stages, namely the cable-influence stage, the grout-influence stage, and the soil-influence stage. U-shaped laying of the cable will increase the heating time when the soil influence stage is stable, which is not conducive to improve the efficiency of ATRT. Due to the influence of simplified calculation, the thermal conductivity calculated from the test results of the U-shaped optical cable has a peak value significantly higher than the thermal conductivity of the soil at the initial stage of heating. With the increase of heating duration, the temperature rise rate under the condition of U-shaped optical cable layout gradually approaches the ideal line heat source temperature rise rate, the calculation result is closer to the true value, and reducing the spacing can speed up this process. As the spacing increases, the recommended heating duration will increase rapidly in order to control the error within 10%. Therefore, to improve the test efficiency, the distance between the U-shaped optical cables should be minimized in the field.

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备注/Memo

备注/Memo:
收稿日期:2021-01-08;改回日期:2021-05-02。
基金项目:南京大学"大学生创新训练计划（编号：202010284136Z、202110284019Z）"、国家自然科学基金"地面沉降钻孔全断面监测与地层变形演化特征研究（编号：41977217）"、"中国和德国城市地下热岛的过去、现在和将来——地温能开发的影响（编号：41761134089）"和中国地质调查局"地表水-地下水补排关系温度示踪实验模拟（编号：NJZX-W-2018-153）"项目联合资助。
作者简介:刘浩,1999年生,男,本科生,主要从事分布式光纤传感相关研究。Email:2498216599@qq.com。
通讯作者:顾凯,1987年生,男,副教授,主要从事地质灾害防控和环境岩土工程研究。Email:gukai@nju.edu.cn。
更新日期/Last Update: 1900-01-01