下蜀土导热系数与电阻率和剪切波速关系模型试验研究

针对导热系数现场难以快速、准确测试的问题,以下蜀土为研究对象,建立了依据电阻率和剪切波速估算导热系数的关系模型。分别采用HC-110热导测试仪、四极法和弯曲元测试系统对20℃、含水率为10%～21%、干密度为1.5～1.8 g/cm3下蜀土的导热系数、电阻率和剪切波速进行了测试,得到了三者与含水率和干密度之间函数关系,建立了导热系数与电阻率和剪切波速的关系模型,经检验,该关系模型拟合度高,为工程实践中利用电阻率和剪切波速快速确定土体导热系数提供了新的方法。

Experimental Study on Relationship between Thermal Conductivity, Resisitivity and Shear Wave Velocity of Xiashu Loess

In view of the difficulty of rapid and accurate testing of the thermal conductivity at the site, rammed soils were used in this study, and a relational model for estimating thermal conductivity based on resistivity and shear wave velocity was established. The HC-110 thermal conductivity tester, quadrupole method and bending element test system respectively used for the thermal conductivity of soil at 20°C, water content between 10%-21%, and dry density between 1.5 and 1.8 g/cm³. The resistivity and shear wave velocity were tested and the relationship between the moisture content and the dry density was obtained. The relationship between thermal conductivity, resistivity and shear wave velocity was established. After testing, the relational model has a high degree of fitness. It provides a new method for rapidly determining the thermal conductivity of soil using resistivity and shear wave velocity in engineering practice.