Research on Calculating Method of Thickness of Anti-frost Heave Insulation Board in Channel Based on Freezing Index and Sunshine Shading Degree Correction Coefficient
Accurately calculating the thickness of the insulation board is the key link in the design of insulation and frost heave prevention of canal.Based on the observation data from the canal test,this study drew a cumulative negative temperature hy-drograph of the canal foundation soil as well as analyzed how the freezing index and sunshine shading modified system affect the freezing depth of the canal foundation soil.Based on the above indexes,the design of thermal resistance calculation formulas of frozen soil layer were established by fitting and solving with Matlab tools.The reliability of the calculation formula was verified by the observation results from a canal frost heave test in an irrigation area in Heilongjiang Province.The findings of this study reveal that the design thermal resistance R0 of the frozen soil layer is closely related to the degree of sunshine shading and the freezing index.The whole process of the development and change of the freezing depth of the canal foundation soil is synchro-nous with the change of the daily negative accumulated temperature.The calculations are consistent with the actual observation results of the canal test.This formula can be widely used in the calculation of the thickness of canal insulation boards in frozen soil areas.
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