Taking Shaanxi Fuping remolded loess as the object of study

soil samples gone through different numbers of freeze-thaw cycle under a closed system

and variations about mechanical index (cohesion) of soil at the different numbers of freeze-thaw cycle are analyzed. Experiment used spherical template into the determination of relative instantaneous strength and long-term strength of frozen loess. After 4 times

the relative instantaneous strength is the largest

but greatly reduces after 6 times. The relative instantaneous strength significantly increases at the eighth time (but less than the forth time)

and gradually becomes stable after 10 times. The largest long-term strength of frozen loess is at the eighth time. The long-term strength at the 6th time and 10th time is similar in the middle level. The lowest relative instantaneous strength is at the 4 th

50 th and 100 th time. Void ratio and density changes are corresponding to relative instantaneous strength. This kind of change rule has the close relationship with moisture migration in the process of freeze-thaw. The relationship between long-term strength and physical properties is not obvious. It is a synthetical reflection of the internal structure

mineral composition and physical properties.