Determination of the thermal conductivity of large volumes of heterogeneous media

UDK: 622.276.012:69 (211)
DOI: 10.24887/0028-2448-2017-5-48-50
Key words: permafrost soil, thermal conductivity, laboratory measurements, thermal characteristic
Authors: I.A. Zholobov, V.S. Zaitsev (Giprotyumenneftegaz PJSC, HMS Group, RF, Tyumen)

The basic initial data for thermal engineering calculations that provide reliable and safe operation of buildings and structures on permafrost soils are the thermophysical properties of soils, in particular the coefficient of thermal conductivity and heat capacity of soils in frozen and thawed states, determining the speed of advancement, the shape of the thawing haloes, etc., some of which Poorly defined indirectly and require direct measurements. Carrying out of measurements in laboratory conditions requires transportation of soil samples from the sampling site with the preservation of not only the frozen state, but what is extremely important is the thermo stating at the level of the temperature values of the sample locations in order to obtain the most objective parameters of the soil properties. Although in most cases it is insignificant, but the coefficient of thermal conductivity of frozen soil depends on temperature, which can be explained in part by the presence of some unfrozen water. In the light of the above difficulties, according to the author, first of all, it is necessary to develop methods of field determination of thermophysical characteristics of frozen soils, as well as in connection with the need to determine the properties of large soil masses. These methods, in the opinion of the authors, have great prospects in connection with a reduction in transportation costs for samples and a more correct determination of soil properties in some cases, as well as the possibility of maintaining an undisturbed soil structure.


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