Experimental Study on Thermal Conductivity of Red Clay Improved by Copper-tail Ore
The thermal conductivity of backfill soil is one of the important factors affecting the load capacity of direct buried cable.In order to explore the influence law of various factors on the thermal conductivity of modified red clay,samples with different sand content,dry density and water content were prepared.Under the condition of constant temperature and airtight,the transient hot-wire method was used to test the thermal conductivity of samples,and the influence law of sand content,dry density and water content on the thermal conductivity of modified red clay was analyzed.The results show that the copper tail sand has a better effect on the thermal conductivity of red clay,and the thermal conductivity of the improved soil increases linearly with the sand content and water content.With the increase of dry density,the increase trend of thermal conductivity of improved soil is phased.When the dry density of improved soil is greater than 1.65 g/cm3,the growth rate of thermal conductivity decreases obviously.The effect of copper-tail sand on the thermal conductivity of modified soil is that a large amount of quartz improves the heat transfer efficiency between solid frames.The influence of moisture content and dry density on the thermal conductivity of improved soil is mainly due to the change of the three-phase heat transfer mode of improved soil.Based on the test results,a new model for predicting the thermal conductivity of the improved soil is established,which can better predict the thermal conductivity of the improved soil.
tail copper orethermal conductivityred clayburied cableinfluence factorprediction model
万方数据
维普
