Frozen-soil phase change latent-heat calculation method of considering unfrozen-water content nonlinear-changes

The invention provides a frozen-soil phase change latent-heat calculation method of considering frozen-soil unfrozen-water content nonlinear-changes. The method comprises: representing change relationships of a frozen-soil unfrozen-water content with negative temperatures as a form of a mathematical equation, and carrying out derivation on the equation; and then using an equation after derivationto represent latent-heat change quantity in an infinitesimal negative-temperature interval, and then calculating, through a method of integration, frozen-soil phase change latent-heat of considering the unfrozen-water content nonlinear-changes. The effect of the method is consideration on the fact that the latent heat continuously changes with the unfrozen-water content changes, and the provided method can describe change relationships of the latent heat and the different negative temperatures. Multiple measurement and calculation show that prediction precision of the calculation method is improved by 72.4% as compare