冻土导热系数试验方法对比研究

采用热线法和热流计法分别对粉质黏土的冻土试样和融土试样进行了导热系数的测定.两种试验结果均反映出导热系数随含水率增大而增大,随干密度增大而增大的变化规律.通过回归分析得出导热系数受含水率的影响明显大于干密度的影响.将两种试验方法所得结果进行比较,并进行差异显著性检验.两种试验方法中,热线法所得导热系数更大,而试验方法的不同对导热系数的数值影响十分显著.在实际工程中进行温度场模拟和热工计算时,需要选择适当的试验方法获取数据,以避免分析结果严重偏离实际.

The Research on the Comparison of Test Measurements for the Thermal Conductivity of Frozen Soil

The hot wire and the heat flow meter are used to measure the thermal conductivities of frozen soil and the silty clay separately.The results reflect that the thermal conductivity will increase with the increasing rate of water content,and will increase with the dry density increasing as well.By the regression analysis,it can be concluded that the thermal conductivity is much more obviously affected by the rate of water content than by the dry density.By comparing the results of the two tests,and taking a test to the significance of difference,the thermal conductivity measured by the hot wire was much larger,while the different ways of test will be more obvious on testing the value of the thermal conductivity.In the practical engineering,it needs to choose the right way of test to get the data when it is in the temperature field simulation and the thermal calculation in order to avoid the analyzing results deviating from the fact.