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基于主动加热型分布式温度感测光缆的土体导热系数测量方法

姚俊成 刘洁 王金路 孙梦雅 方可 施斌

姚俊成,刘洁,王金路,等. 基于主动加热型分布式温度感测光缆的土体导热系数测量方法[J]. 水文地质工程地质,2023,50(1): 179-188 doi:  10.16030/j.cnki.issn.1000-3665.202111076
引用本文: 姚俊成,刘洁,王金路,等. 基于主动加热型分布式温度感测光缆的土体导热系数测量方法[J]. 水文地质工程地质,2023,50(1): 179-188 doi:  10.16030/j.cnki.issn.1000-3665.202111076
YAO Juncheng, LIU Jie, WANG Jinlu, et al. A study of soil thermal conductivity measurement based on the actively heated distributed temperature sensing cable[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 179-188 doi:  10.16030/j.cnki.issn.1000-3665.202111076
Citation: YAO Juncheng, LIU Jie, WANG Jinlu, et al. A study of soil thermal conductivity measurement based on the actively heated distributed temperature sensing cable[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 179-188 doi:  10.16030/j.cnki.issn.1000-3665.202111076

基于主动加热型分布式温度感测光缆的土体导热系数测量方法

doi: 10.16030/j.cnki.issn.1000-3665.202111076
基金项目: 国家自然科学基金重点项目(42030701);国家重大科研仪器研制项目(41427801)
详细信息
    作者简介:

    姚俊成(1998-),男,硕士研究生,主要从事岩土工程及光纤监测技术等方面研究。E-mail:yaojc@smail.nju.edu.cn

    通讯作者:

    刘洁(1998-),女,博士研究生,主要从事工程地质和环境岩土工程方面的研究。E-mail:dz1929013@smail.nju.edu.cn

  • 中图分类号: TU411

A study of soil thermal conductivity measurement based on the actively heated distributed temperature sensing cable

  • 摘要: 主动加热型分布式温度感测技术(AH-DTS)可通过植入土体中的光缆实现不同层位土体导热系数的分布式连续测量,但AH-DTS光缆导热系数测量方法的准确性和敏感性有待进一步研究。通过室内试验,对比了碳纤维加热感测光缆(CFHC)和铜网加热感测光缆(CMHC)的热响应过程,通过数值模拟验证了光缆结构对导热系数测量结果的影响。研究结果表明:(1)CFHC和CMHC的热响应过程可通过微分法分为光缆内部传热、纤-土过渡以及土体稳定传热3个阶段,光缆结构差异导致传热速率不同,使得CFHC导热系数测量初始时刻比CMHC提前100 s;(2)光缆尺寸与比热容差异下CFHC的升温值更高,相同测温精度CFHC的导热系数测量结果较CMHC更加稳定准确;(3)增大加热功率或延长加热时间均会提高CFHC和CMHC测量土体导热系数的准确性。研究成果为该技术的进一步完善和推广提供了重要依据。
  • 图  1  AH-DTS法原理示意图

    Figure  1.  Schematic diagram of the AH-DTS method

    图  2  CFHC与CMHC光缆结构图

    Figure  2.  Structure of CFHC and CMHC

    图  3  试验装置结构示意图

    Figure  3.  Schematic diagram of the test device structure

    图  4  CFHC和CMHC数值模拟模型结构图

    Figure  4.  Diagrams showing the numerical simulation model structure of CFHC and CMHC

    图  5  CFHC与CMHC温度时程曲线

    Figure  5.  Curves of temperature rise of CFHC and CMHC

    图  6  不同加热功率下CFHC与CMHC的d∆T/dlntt图像

    Figure  6.  Charts of d∆T/dlntt of CFHC and CMHC under different heating power

    图  7  不同加热功率和不同加热时间下CFHC和CMHC的导热系数测量结果

    Figure  7.  Thermal conductivity of CFHC and CMHC under different heating power and heating times

    图  8  5 W/m与25 W/m加热功率下CMHC的拟合曲线

    Figure  8.  Fitted curves of CMHC under the heating power of 5 W/m and 25 W/m

    图  9  15 W/m加热功率CFHC和CMHC径向温度分布

    Figure  9.  Radial temperature profiles of CFHC and CMHC under the heating power of 15 W/m

    图  10  不同加热功率下CFHC和CMHC的影响半径变化趋势

    Figure  10.  Influence radius of CFHC and CMHC under different heating power

    表  1  黄土的基本物理参数

    Table  1.   Basic physical parameters of the test soil

    参数原位含水率塑限液限塑性指数
    测量值20.29%17%27%10
    下载: 导出CSV

    表  2  不同加热功率Q下CMHC的ΔT-lnt曲线拟合结果

    Table  2.   ΔT-lnt fitted results of CMHC under different heating power

    Q
    /(W·m−1
    kR2λ
    /(W·m−1·K−1
    相对误差
    /(W·m−1·K−1
    50.40120.97410.9917−0.2523
    100.66900.97751.1895−0.0545
    151.00920.98271.1828−0.0612
    201.35980.99391.1704−0.0736
    251.62100.99871.2273−0.0167
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-27
  • 修回日期:  2022-01-10
  • 网络出版日期:  2022-12-20
  • 刊出日期:  2023-01-13

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