The Experiments Research On Thermal Conductivity Of Frozen Soil

China is the third greatest country with frozen earth, in possession of most plentiful resource of frozen soil. With the economy and construction developing rapidly, exploitation in cold area becoming more and more, it is turning to be the most important issue how to make use of resource of frozen soil rationally for construction in cold area. Frozen soil is a special kind of soils which is susceptive for temperature. There are a lot of incident phenomenon appear during the prosess of freezing and thaw. It would be the huge loss for the foundation engineering. Many countries have woke up to the serious of the problem, with the climate around the world rising increasingly and frozen soil melting continuously. In order to alleviate the impact on people's daily life and economic construction from frozen soil melting, they are making great effort to research.It is the keystone of frozen soil to research the thermodynamics field of it, and the temperature status of frozen soil affects the exchange between heat and nature in thermodynamics field directly. It is prominent for thermodynamics parameters of frozen soil affecting passing heat and nature in the process of heat passing, so it is necessary to find out thermodynamics parameters of frozen soil for the research on diathermancy of frozen soil. The coefficient of thermal conductivity is a quite important basic index in thermodynamics parameters of frozen soil, and it is the most important factor to affect the changing speed of temperature field of frozen soil. The test on calorifics index of frozen soil in our country started a little later, but we have acquired remarkable achievement in coefficient of thermal conductivity and thermal diffusivity while economic developing and technology progressing.There are two ways to mensurate the coefficient of thermal conductivity of frozen soil, the steady-state technique and the unsteady-state technique. The paper is on hot-wire technique which is one of all the unsteady-state techniques to measure the coefficient of thermal conductivity of silty clay in the state of frozen and unfrozen, and analyze the datum from the experiment, finally make compare with the datum in the criterion, the datum measured by heat-flow meter before, and the datum of the original silty clay measured by the normal state technique. By comparing, the current reflected by the coefficient of thermal conductivity measured by hot-wire technique is approximately the same to it reflected by other two methods and the criterion. In numerical value, the coefficient of thermal conductivity measured by hot-wire technique are bigger than it measured by other two methods and criterion. By comparing the three methods for each other and maths analyse, there are prominent differences. The result on experiment is related with the kind of soil and methods directly. The paper offer the reference to the choose of experiment soils and methods when measuring the coefficient of thermal conductivity in the future, expecting research and analyse more detailed in coming experiment.