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土体热传导性能及其热导率模型研究
Research of Soil Thermal Conduction Properties and Its Thermal Conductivity Model
投稿时间:2018-03-16  修订日期:2018-04-28
DOI:103969/j.issn.1007 9629201901011
中文关键词:  热传导  饱和度  矿物成分  非冻土  归一化模型
英文关键词:thermal conduction  saturation  mineral composition  unfrozen soil  normalized model
基金项目:国家自然科学基金资助项目(41807260);中央高校基本科研业务费专项资金资助项目(CUG170636,CUGL170807)
              
作者单位
张涛
ZHANG Tao
中国地质大学工程学院,湖北武汉430074
School of Engineering, China University of Geosciences, Wuhan 430074, China
刘松玉
LIU Songyu
东南大学岩土工程研究所,江苏南京210096
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
张楠
ZHANG Nan
德州大学阿灵顿分校土木工程学院,德克萨斯州阿灵顿76019
School of Civil Engineering, The University of Texas at Arlington, Arlington 76019, USA
段隆臣
DUAN Longchen
中国地质大学工程学院,湖北武汉430074
School of Engineering, China University of Geosciences, Wuhan 430074, China
蔡国军
CAI Guojun
东南大学岩土工程研究所,江苏南京210096
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
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中文摘要:
      为研究不同土体的热传导特性变化规律,利用热探针测试了南京地区典型土体在不同含水量和干密度状态下的热阻系数,分析了含水量、干密度、饱和度以及矿物成分等因素对土体热阻系数的影响,研究了不同状态下土体热导率的预测模型,提出了适用于不同地区土体热阻系数估算的修正系数.结果表明:南京地区典型土体的热阻系数随含水量和干密度增加而减小,当含水量超过一定范围后,热阻系数趋于稳定;热阻系数与饱和度之间的关系表现出与其含水量之间相似的变化规律;土颗粒的热传导特性由其矿物成分决定,石英含量对土颗粒热传导特性有着显著影响;提出了可用于非饱和土热导率估算的修正归一化模型,该模型对于粗粒土具有较高的预测精度,细粒土则需考虑区域差别进行修正.
英文摘要:
      To investigate the heat transfer characteristics of different soils, a non steady thermal probe technology was used to measure thermal resistivity of typical soils in Nanjing area with different moisture content and dry density. The effect of moisture content, dry density, saturation, mineral composition and other factors on thermal resistivity were studied and the generalized thermal conductivity prediction models for soils at different states were established. The correction factors for prediction model to estimate thermal resistivity of both Nanjing and India soils were proposed. The test results indicate that thermal resistivity of soil decreases with the increase of moisture content and dry density and trends to the constant value when moisture content exceeds a certain value. The relationship between thermal resistivity and saturation is similar to that of moisture content. Thermal conductivity of soil particle is determined by itsmineral composition and the fractions of quartz have a significant effect on the heat transfer characteristics of particles. Geometric mean method can be used to estimate the thermal conductivity of saturated soils. A modified normalized model for predicting thermal conductivity of unsaturated soils at unfrozen state is proposed, and the prediction results for sandy soil are of high accuracy, but for fine particle soils are needed to be adjusted for considering the difference in soil deposited areas.
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