基于非稳态线源传热理论的弱结构岩体导热系数测试方法研究  

Research on the test method of thermal conductivity of weakly structured rock body based on the theory of unsteady line source heat transfer

作　　者：梁昌明 高强 何剑波 骆进[1] LIANG Changming;GAO Qiang;HE Jianbo;LUO Jin(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Wuhan Institute of Geotechnics,Chinese Academy of Sciences(State Key Laboratory of Geotechnical Mechanics and Engineering),Wuhan 430071,China;Hydrogeological and Engineering Geological Survey Institute of Gansu Provincial Geological and Mineral Exploration and Development Bureau,Zhangye 734000,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国科学院武汉岩土力学研究所(岩土力学与工程国家重点实验室),湖北武汉430071 [3]甘肃省地质矿产勘查开发局水文地质工程地质勘察院,甘肃张掖734000

出　　处：《中国测试》2025年第2期55-61,共7页China Measurement & Test

基　　金：湖北省自然科学基金联合基金项目(2023AED197)。

摘　　要：泥岩、弱胶结砂岩和砾岩等弱结构岩体取样、运输和加工过程容易造成结构扰动,不适宜进行室内热物性测试,而现有现场测试方法无法克服测孔与岩体间空隙的影响,造成测试结果失真。鉴于此,该文基于非稳态线热源理论修正,研发一种考虑探针和热耦合剂相结合的测试方法。通过室内测试对比,验证仪器的测试误差小于5%,表明其准确性满足要求。此外,深入分析砂岩表面粗糙度对结果的影响,有无耦合剂的导热系数测试差异为14.1%。形貌分析揭示样品表面粗糙度较大,证明探头与岩体较接触不良会显著影响测试精度。因此,该文提出的方法能够较好地克服传统方法的局限,为弱结构岩体导热系数测试提供新的思路。The structural disturbances of weakly rocks such as mudstone,weakly cemented sandstone and gravel during sampling,transportation,and processing,they are not suitable for laboratory thermal property test.Moreover,the existing in-situ methods have the drawbacks of ignoring the gap borehole and the rock mass,resulting in significant deviation.Aim to solve these problems,this study develops a novel testing method which integrates a probe and a thermal coupling agent,based on transient line heat source theory.Laboratory tests have confirmed the instrument's error margin to be less than 5%,showing it fits the measuring criteria.Additionally,the thermal conductivity of rough sandstone with and without deploying agent shows a difference of 14.1%.The morphology analysis reveals that the surface roughness of the sample leads to the poor contact between the probe and the rock mass,resulting in the deviation.Consequently,the method proposed can overcome the limitations of traditional approaches and provides a new perspective for measuring the thermal conductivity of weakly structured rock.

关 键 词：弱结构岩体 线热源理论 导热系数测试 表面粗糙程度 

分 类 号：TB9[一般工业技术—计量学] TU455[机械工程—测试计量技术及仪器]