Numerical Analysis On Thermal Field Of Unsaturated Loess Soils

Based on the existing researches about the thermal field in unsarurated loess soils,this paper gives the finite element module of thermal field after consideration of various natural elements such as wind speed, radiation, evaporation Furthermore, The paper also probes the interaction of temperature and water content. Various dry-density and moisture content is tested, getting it's heat-conducting coefficient and heat capacity. At the same time the paper deduces the heat parameters formula in defferent water content and dry-density with minimum two multiplicationses principle. The test data indicates that heat-conducting coefficien of soil sample increase with the increase of water content and dry-density, and heat-conducting changes obviously on water content. The heat capacity of soil sample increase with the increase of water content and the decrease of dry-density, and the dry-density have obvious effect on heat capacity. Last, the thermal field of naked soil is computed with the calculation model and curve fit heat parameters formula, The results calculated by this method agree well with actual field measurement, which shows this method is correct and effective to analyze the thermal field on the unsarurated loess soils. Furthermore, come to the conclusion that the change regulation of unsarurated loess soils temperature in defferent depth and same month on daytime, black day, month average and the year change regulation of unsarurated loess soils temperature in same depth and defferent month on daytime, black day, month mean temperature. And gaining the constant temperature layer of loess soils regions.This paper also deduce the temperature changing range formula of defferent depth and defferent month.