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土壤热导率的温度效应试验和预测研究

刘晨晖, 周 东, 吴 恒

刘晨晖, 周 东, 吴 恒. 土壤热导率的温度效应试验和预测研究[J]. 岩土工程学报, 2011, 33(12): 1877-1886.
引用本文: 刘晨晖, 周 东, 吴 恒. 土壤热导率的温度效应试验和预测研究[J]. 岩土工程学报, 2011, 33(12): 1877-1886.
shu
LIU Chen-hui, ZHOU Dong, WU Heng. Measurement and prediction of temperature effects of thermal conductivity of soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1877-1886.
Citation: LIU Chen-hui, ZHOU Dong, WU Heng. Measurement and prediction of temperature effects of thermal conductivity of soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1877-1886.
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土壤热导率的温度效应试验和预测研究  English Version

  • (1. 广西大学土木建筑工程学院，广西 南宁 530004 ； 2. 同济大学岩土及地下工程教育部重点实验室，上海 200092)

基金项目: 国家自然科学基金项目 （ 40772190 ） ；广西自然科学基金项目 （ 0832026 ）
详细信息
    作者简介:

    刘晨晖 (1986 – ) ，男，江西赣州人，博士研究生，从事环境岩土工程研究。

  • 中图分类号: TU43

Measurement and prediction of temperature effects of thermal conductivity of soils

  • (1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China )

摘要

    摘要
  • 摘要: 目前国际上对于高温下土壤的完整热导率数据极其缺乏，通过 KD2 Pro 测试了粉砂质黏壤土和细砂在较宽广温度 (5 ℃～ 88 ℃ ) 和含水率范围内的热导率。测试结果表明，由于水蒸气的凝结和蒸发产生的潜热传输效应，在 88 ℃下热导率最高可达 5 ℃时的 3 ～ 4 倍，热导率随含水率的变化存在明显的临界含水率 ( 依赖于颗粒组成 ) 。对基于 de Vries 假设的 de V-1 和 Campbell 理论模型的验证和对比表明，参考文献中的一些参数及其获取方法的适用性需要改进，修正后的模型基本能较好地预测不同温度下热导率的变化 (RMSE ＜ 30%) ，且 温度越接近 40 ℃误差越小，粉砂质黏壤土在高温下 (58 ℃～ 88 ℃ ) 的 θ AWC ～ θ PWP 区间建议乘以传质增强因子(=2.5)。模型均较为复杂，有待于在此基础上进一步建立易用的经验性模型。
    Abstract: Currently, there is an extreme deficiency of complete data of thermal conductivity of soils under high temperature around the world, tests are thus conducted through KD2 Pro on the silty clay loam and fine sand within a wide range of temperatures (5 ℃～ 88 ℃ ) and water contents. The results indicate that the thermal conductivity under 88 ℃ is 3 or 4 times as high as that under 5 ℃ due to the latent heat transfer effect caused by condensation and evaporation of vapor. The critical water content, which depends on texture, exists as thermal conductivity changes with the water content. According to the verification and comparison of de V-1 and Campbell theoretical models from de Vries’s hypothesis, improvements are needed on some parameters and the applicability of achieving them in the references. However, the modified models can comparatively better predict the change of the thermal conductivity under different temperatures (RMSE ＜ 30%). The closer to 40 ℃ , the lower the error. It is suggested that a mass transfer enhancement factor of 2.5 should be multiplied under 58 ℃～ 88 ℃ within θAWC ～ θ PWP for silty clay loam. Judged by the complexity of these two models, the more convenient empirical models are expected to be established based on this foundation.
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    • 参考文献(35)
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  • 发布日期:  2011-12-14

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