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A Calculation Method of Thermal Conductivity for Saturated Frozen Soil

A thermal conductivity calculation and thermal conductivity technology, which is applied in the field of rock and soil heat transfer, can solve problems such as difficult operation, unverified applicability of saturated frozen soil, and many environmental factors, and achieve accurate calculation results, convenient and accurate calculation method , Calculate the effect of simple thinking

Active Publication Date: 2021-07-20
TIANJIN CHENGJIAN UNIV
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Problems solved by technology

[0003] At present, due to the imperfection of testing methods and testing theory, the accuracy of thermal conductivity of permafrost through indoor testing is not high; there are many environmental factors in the field measurement, and the operation is difficult, so it will also lead to large deviations in the test results
Calculation by theoretical formula is another important way to obtain the thermal conductivity of saturated frozen soil, but since the existing theoretical formula is evolved based on non-soil research, the applicability to saturated frozen soil composed of multi-media has yet to be verified
The thermal conductivity of saturated frozen soil can also be obtained through empirical formulas, but the empirical formulas are often obtained based on regional soil test data and cannot be applied to soils in other regions or other types of soils, so there are certain limitations

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  • A Calculation Method of Thermal Conductivity for Saturated Frozen Soil

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0041] The calculation method of the present invention proposes the principle that during the freezing process, the pore water away from the surface of the soil particles first freezes into pore ice, and the pore ice will eventually develop into a complete and through pore ice skeleton in the saturated frozen soil. At this time, there are two complete heat transfer pathways in saturated frozen soil: soil skeleton and ice skeleton. Unfrozen water exists near the surface of soil particles, sandwiched between the soil skeleton and the ice skeleton, forming a spatial arrangement structure of "soil-water-ice". Since the thermal conductivity of soil is only an order of magnitude different from that of ice, the two can be regarded as two independent heat transfer paths to a certain extent, thus the heat transfer of "soil-water∥ice-water" is proposed m...

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Abstract

The invention provides a method for calculating the thermal conductivity of saturated frozen soil, the method includes the steps of calculating the desired dry density ρ d The volume content of soil particles in the saturated frozen soil; determine the required dry density ρ according to the unfrozen water test d Unfrozen water content of saturated frozen soil; determine the volume content of pore ice in saturated sandy frozen soil; calculate the volume ratio of soil skeleton, unfrozen water, and pore ice in saturated sandy frozen soil respectively ; Calculate the thermal conductivity λ of saturated frozen soil. The beneficial effects of the present invention are: a new calculation method is provided for the thermal conductivity research of permafrost and the calculation of geotechnical heat; the calculation method comprehensively considers the influence of various influencing factors, involves few unknown parameters, and the average error between the calculation result and the actual measurement result is lower than 5%.

Description

technical field [0001] The invention relates to the technical field of rock-soil heat transfer, in particular to a method for calculating the thermal conductivity of saturated frozen soil, which is used for the analysis of temperature changes in cold regions and the calculation of the temperature field of frozen rock-soil during the construction process of the freezing method. And theoretical research on physical and thermal parameters of frozen soil. Background technique [0002] Thermal conductivity is an important thermal parameter of rock and soil, and an important factor affecting the temperature field of soil. Saturated normal temperature soil is composed of two phases of soil and water, so the analysis and calculation are not complicated. However, for saturated frozen soil composed of three phases of soil, water and ice, the influence of temperature needs to be considered, which increases the difficulty of analyzing the thermal conductivity of saturated frozen soil. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20G06F17/18
Inventor 张翻李顺群陈之祥杨文喜柴寿喜周亚东夏锦红王英红
Owner TIANJIN CHENGJIAN UNIV
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