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Thermal characterization and prediction model of typical soils in Nanjing area of China

机译：南京地区典型土壤的热特性和预测模型

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The thermal resistivity of soil is a basic parameter to describe its heat transfer characteristic and also is a key parameter in analysis of soil heat transfer in geotechnical engineering. The thermal probe testing technology and its theory were introduced. Four different typical soils in Nanjing area were measured by non-steady-state probe. The relationship between the soil thermal resistivity and moisture content was analyzed at different dry densities. It could be concluded that the non-steady-state probe can effectively measure the thermal resistivity of soils. With an increase in both moisture content and dry density, the magnitude of thermal resistivity decreased. There is a dramatical decrease of thermal resistivity in the initial stages of adding water to the dry soil. The thermal resistivity decreases rapidly within moisture content in a relatively small range and then approach equilibrium with further increase in moisture content. The critical moisture content is a great importance index which depends on the natural properties of soils. Thermal resistivity decreases with the increase of dry density and particle size. This effect is also related to mineral composition, particle shape and other factors. Based on the existing prediction model and testing results, a new prediction model was proposed to predict the thermal resistivity of soils. The results indicate that the predicted values generally agreed with the measured values within an absolute difference of less than 15%. (C) 2015 Elsevier B.V. All rights reserved.
机译：土壤的热阻是描述其传热特性的基本参数，也是岩土工程中土壤传热分析的关键参数。介绍了热探针测试技术及其理论。用非稳态探针测量了南京地区的四种不同典型土壤。分析了不同干燥密度下土壤热阻与含水量之间的关系。可以得出结论，非稳态探头可以有效地测量土壤的热阻率。随着水分含量和干密度的增加，热阻率降低。在向干土中添加水的初始阶段，热阻会急剧下降。在水含量相对较小的范围内，热阻迅速降低，然后随着水含量的进一步增加达到平衡。临界水分含量是非常重要的指标，它取决于土壤的自然特性。随着干密度和粒度的增加，热阻降低。这种作用还与矿物成分，颗粒形状和其他因素有关。基于现有的预测模型和测试结果，提出了一种新的预测模型来预测土壤的热阻率。结果表明，预测值通常与测量值相符，且绝对差小于15％。 （C）2015 Elsevier B.V.保留所有权利。

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