Road foundation thawing at change in Ice content along the active layer depth

The seasonal temperature and humidity regime of the road foundation in active layer soil largely determines reliability safety automobile use. aim this article is a quantitative assessment influence variation ice content permafrost area on depth thawing. Analytical solutions one-phase flat Stefan problem at varying along coordinate were obtained. solution dimensionless form as Fourier function based number simplexes. dependence change distance was assumed to be linear. Calculations using obtained formulas conducted, comparing against assuming that constant. It determined which gradient averaging does not lead an error greater than permitted engineering practice determination thawing depth. results variant calculations are presented 2D 3D charts assess initial degree its over period use foundation.