By soil samples soaking

the performance of a medium expansive soil embankment covered by lime-treated soil subjected to weather influence is simulated; the variant mechanical and deformation behaviors in soaking and non-soaking statuses are investigated through field direct shear tests

plate loading tests and swelling ratio tests. Based on the above test results

an analytic model of embankment subjected to weather influence is established; then the pavement deformation due to subsoil performance changes under soaking swelling and traffic loading conditions is calculated. According to the comparison between computed differential settlement and deformation allowance

the probability of pavement structure damage is evaluated

which is of referential significance to the design of medium expansive soil embankment.