It has become a common understanding that freeze-thaw cycling is a kind of weathering process which considerably changes geotechnical properties of soils due to cryogenic actions. Therefore

the influence of freeze-thaw must be taken into account when selecting soil parameters for stability and deformation analysis of many geotechnical engineering problems in cold regions where newly exposed soil layers are bound to be submitted to freeze-thaw cycling. The changes in strength parameters (c

φ) and pre-consolidation pressure (Pc) due to freeze-thaw are investigated through testing on a frost-susceptible soil

Lanzhou loess within a wide range of dry density and temperature. The soil samples have all experienced one freeze-thaw cycle. Direct shear and 1-D compression tests are carried out on the samples before and after freeze-thaw. Testing results before and after freeze-thaw are then comparatively analyzed. It is shown that the pre-consolidation pressures and strength parameters are influenced by freeze-thaw.