The thermal conductivity (TC) of rock has a general application in safety assessment and engineering optimization of deep geological engineering practices such as geothermal mining and nuclear waste disposal. Determining the TC of rock by using a TC model is a convenient and effective method for such evaluation, and selecting a suitable TC model is key for ensuring accurate calculation results. In this study, we firstly select eight two-phase TC models to evaluate the applicability to sandstone. Secondly, the TC values of sandstones in various porous media such as air, water, and ice are measured by using the transient plane source (TPS) method, and the mineral composition and content were determined by using X-ray diffraction (XRD) and the Cross, Iddings, Pirsson, and Washington (CIPW) norm. Thirdly, the TC values of sandstones in different porous media are also calculated by using the eight models, and their deviations are analyzed to compare their applicability. Finally, by considering of the influence of pore structure on the rock TC, a new TC model referred to as the thermal resistance–connectivity (TRC) model is proposed for sandstone based on pore connectivity, and the mean deviation is compared with the previous model. Several results are obtained. Among the eight common models, the geometric mean model is found to be more accurate than other models regardless of all three states. In particular, for the porous medium filled with ice, the calculated value of the Geometric mean model had the most significant agreement with the measured value. In addition, the mean deviation of the TRC model for all three states is shown to be more consistent with the measured value than the eight models. Therefore, we recommended the TRC model for calculating the TC of sandstone. This study provides a novel method for determining the TC value for deep geological assessment.

岩石的导热系数（TC）在深层地质工程实践（例如地热开采和核废料处置）的安全评估和工程优化中具有普遍的应用。使用TC模型确定岩石的TC是一种方便有效的评估方法，选择合适的TC模型是确保计算结果准确的关键。在这项研究中，我们首先选择8个两相TC模型来评估对砂岩的适用性。其次，采用瞬态面源（TPS）方法测量空气，水和冰等各种多孔介质中砂岩的TC值，并采用X射线衍射（XRD）和X射线衍射法测定矿物组成和含量。十字架，艾丁兹，皮尔逊和华盛顿（CIPW）规范。第三，运用这八种模型计算了不同孔隙介质中砂岩的TC值，并分析了它们的偏差以比较其适用性。最后，考虑孔隙结构对岩石TC的影响，提出了一种基于孔隙连通性的砂岩热阻-连通性（TRC）模型，并将其平均偏差与以前的模型进行了比较。 。获得了几个结果。在这八个常用模型中，无论所有三个状态如何，几何均值模型都比其他模型更准确。特别地，对于充满冰的多孔介质，几何均值模型的计算值与测量值具有最显着的一致性。此外，与所有八个状态相比，TRC模型在所有三个状态下的平均偏差都与测量值更加一致。因此，我们建议使用TRC模型来计算砂岩的TC。这项研究提供了一种确定深层地质评估的TC值的新方法。