In the soft soil areas

such as Shanghai

artificial freezing method is adopted for constructing 98% underground engineering of metro side channel

pumping stations

and cross-river tunnels

but the method also causes notable problems of frost heaving and thaw collapsing on subway tunnel and surrounding geology environment. Although physical and mechanical properties of frozen soils have been studied

it is hardly sufficient for the research on the dynamic plastic deformation of freezing-thawing saturated silty sand. A remold-striping equipment was designed

and a method of saturating and freezing-thawing was proposed. The dynamic cumulated axial strain characteristics of freezing-thawing saturated Shanghai silty sand was studied using triaxial testing system. The experimental results reveal that compared with traditional compaction method

the remold-stripping equipment and proposed test methods provide an effect way for remolding

saturating

and freezing-thawing silty sand. The height and volume frost heaving ratio of intact saturated silty sand sample showed less influence with freezing temperature

but remolded silty sand frost heaving ratio increased as freezing temperature decreased. The axial permanent axial strain was closely related to the dynamic pore water pressure and less influenced by freezing temperature. Reducing vibration frequency resulted in smaller cumulated plastic strain. Increasing effect cell pressure and dynamic stress amplitude can significantly reduce the dynamic cumulated axial plastic strain of remolded freeing-thawing saturated sandy silt. Improved semi-logarithmic mode of cumulated permanent axial strain on freeing-thawing saturated silty sand was proposed and verified by experimental data

which could exactly forecast development trend of dynamic permanent axial strain.