The thermal conductivity of soil is a fundamental physical property related to heat conduction and also one of the widely applied parameters in geotechnical engineering. Thermal needle tests were performed to measure the thermal conductivity of transparent sand. The thermal conductivity of three particle sizes of transparent sand was measured at different porosities and temperatures. The result shows that the thermal conductivity of transparent sand decreases with the increase of porosity and temperature. A modified model is proposed to calculate the thermal conductivity of the tested sand. Compared with the literature models, which are only suitable for room temperature, the modified model in this paper is applicable to a wider temperature range, ranging from 5^∘C to 45^∘C. It will also be beneficial to future studies on thermal reponses of granular materials, i.e., energy pile model test using transparent sand.

土壤的热导率是与热传导有关的基本物理性质，也是岩土工程中广泛应用的参数之一。进行热针测试以测量透明沙子的热导率。在不同的孔隙率和温度下测量了三种粒径的透明砂的热导率。结果表明，透明砂土的导热系数随孔隙度和温度的升高而降低。提出了一种改进的模型来计算被测砂的热导率。与文献车型，这是仅适用于室温下相比，在本文中的修改后的模型是适用于更宽的温度范围，范围从5 ^∘ C至45 ^∘C.这对将来对粒状材料的热响应的研究也将是有益的，例如，使用透明沙子的能量堆模型测试。