| 考虑冻融影响的岩土类材料导热系数计算新方法 |
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| 引用本文： | 谭贤君,褚以惇,陈卫忠,戴永浩,陈培帅.考虑冻融影响的岩土类材料导热系数计算新方法[J].岩土力学,2010,31(Z2):70-74. |
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| 作者姓名： | 谭贤君 褚以惇 陈卫忠 戴永浩 陈培帅 |
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| 作者单位： | 1. 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，武汉 430071； 2. 中交第二公路勘察设计研究院有限公司，武汉 430056； 3. 山东大学 岩土与结构工程研究中心，济南 250061 |
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| 基金项目： | 国家自然科学基金重大国际合作项目（No. 50720135906）；国家自然科学基金（No. 41072238）。 |
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| 摘 要： | 从多孔随机混合介质理念出发,提出了考虑相变及未冻水影响的冻融条件下岩土类材料的导热系数计算的新方法,并根据已有的试验数据,利用多孔随机混合介质模型求出了同等条件下的导热系数,研究结果表明:模型的计算结果和试验结果基本一致,其平均偏差为2.3%,最大偏差为5.4%。另外,通过与现有的3种导热系数的取值方法的比较发现:目前广泛使用的指数加权平均法在0℃以上时计算结果较准确,但并不适合计算低温(0℃以下)岩土类材料的导热系数。加权调和平均法和加权算术平均法计算结果误差都很大,且不能反映相变对导热系数的影响。研究成果为低温相变条件下岩土介质温度场的正确求解提供了理论前提。
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| 关 键 词： | 寒区 隧道 围岩 导热系数 |
| 收稿时间： | 2010-07-20 |
A new method to study thermal conductivity of geomaterials considering phase change |
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| TAN Xian-jun,CHU Yi-dun,CHEN Wei-zhong,DAI Yong-Hao,CHEN Pei-shuai.A new method to study thermal conductivity of geomaterials considering phase change[J].Rock and Soil Mechanics,2010,31(Z2):70-74. |
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| Authors: | TAN Xian-jun CHU Yi-dun CHEN Wei-zhong DAI Yong-Hao CHEN Pei-shuai |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Second Highway Consultants Co., Ltd. of China Communications Construction Corporation, Wuhan 430056, China; 3. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China |
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| Abstract: | Based on random mixed media (RMM) and combining with the characteristics of geotechnical material, a new method is proposed to calculate the thermal conductivity of geomaterials under low temperature considering phase change. According to the experimental data, RMM is adopted to calculate the thermal conductivity under the same experimental condition. The results of numerical calculation are compared with that of experiment; it is concluded that the results consist with each other; the maximum and mean deviations are 5.4% and 2.3%. Compared with other current three methods (exponential weighted average method, weighted harmonic mean method and weighted arithmetic mean method) on calculation of thermal conductivity, it is shown that: the popular exponential weighted average method is suitable for temperature above 0℃ but not for temperature below 0℃. The errors of results from weighted harmonic mean method and weighted arithmetic mean method are very great; and the effect of phase change on thermal conductivity can’t be reflected with this method. A reference is provided on determination of temperature field for geotechnicals under low temperature considering phase change. |
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| Keywords: | cold region tunnel surrounding rock thermal conductivity |
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