Optimization of surface contact-based thermal conductivity model of cemented particles

In order to explore better the variation law of thermal conductivity of geomaterials, and reduce the thermal damage caused by the problem, according to the structural characteristics of the cemented particles, combined with the effective medium thermal conductivity model and the surface contact thermal conductivity model, the effective thermal conductivity calculation model suitable for the geotechnical cemented particulate material was constructed, and the state of the particulate matter and the cementitious matrix were considered. The transient hot wire method was applied to test the thermal conductivity of the experimental test block, and the predicted values were compared with the measured results and the calculated results of the Maxwell-Eucken model. It was found that with the increase of porosity, the calculated values of the thermal conductivity of both models decrease gradually. The results of the four sets of test data show that the average digit of the calculated thermal conductivity of the Maxwell-Eucken model is 0.171 72 W/(m·K), and the average figure of the calculated model of the optimized thermal conductivity is 0.171 39 W/(m·K). It indicates that the conclusion of the optimized thermal conductivity calculation model is closer tothe actual average test result(0.169 22 W/(m·K)), which can better predict the thermal conductivity of cemented particulate matter.