A Calculation Method for Thermal Conductivity of Saturated Sandy Frozen Soil

Abstract

The invention provides a heat conductivity coefficient calculation method applicable to saturated sandy frozen soil. The method comprises the following steps: converting volume of soil skeleton in saturated sandy frozen soil of which dry density is calculated to be rho d; determining the content of unfrozen water in the saturated sandy frozen soil with the dry density rho d according to an unfrozen water test; determining the volume content of an ice body in the saturated sandy frozen soil; respectively calculating volume ratios of the soil skeleton, the unfrozen water and the ice body accounting for the saturated sandy frozen soil in the saturated sandy frozen soil; and calculating the heat conductivity coefficient lambda of the saturated sandy frozen soil. The method disclosed by the invention has the effects that the method has the characteristics of intuitiveness, convenient calculation and the like and provides a convenient means for calculating the heat conductivity coefficient of the saturated sandy frozen soil. According to the calculation and measurement contrast, the prediction error of the calculation method on the heat conductivity coefficient of the sandy frozen soil is within 4.31%. Due to the increase of the error precision, the calculation precision of the heat conductivity coefficient of the frozen soil can be improved to the greatest degree, and convenience is provided for temperature field prediction in frozen soil engineering.

Description

technical field [0001] The invention belongs to the thermal conductivity calculation field in the field of frozen soil engineering, in particular to a thermal conductivity method suitable for saturated sandy frozen soil, and the calculation can be used for calculating the thermal conductivity of saturated sandy frozen soil. Background technique [0002] Thermal conductivity is an important factor affecting the distribution of soil temperature field, and it is the most important heat transfer property of soil. Saturated frozen soil is a three-phase body composed of soil, water, and ice. The content of unfrozen water at different negative temperatures is different, resulting in significant differences in the thermal conductivity of frozen soil at different freezing times. It is the key to determine the thermal migration properties of frozen soil to study the change law of thermal conductivity of frozen soil with its unfrozen water content. Due to the turbulent characteristics...

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Problems solved by technology

Patent No. 201510195398.3 discloses a calculation method for the thermal conductivity of frozen soils with different textures. The formula is obtained by fitting with consideration of multiple factors. There is a large discreteness in the implementation process, and it is easy to cause soil deformation when using the artificial freezing method. Excessive frost heaving and thawing will affect the durability and stability of the structure to a certain extent

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