Abstract：With the demands of fundamental construction in cold regions or special construction environment，it is more necessary to research the problems occurring in frozen rock mechanics. Taking the frozen shaft project of Hujia River coal mine in Shaanxi Bingchang coal mine area as the project background，sandstone and coal samples collected from the field，respectively，are tested under the triaxial compression at different confining pressures at the room temperature 20 ℃ and different freezing temperatures of －5 ℃，－10 ℃ and －20 ℃. Based on the experimental results，the influential law of confining pressure and freezing temperature on the triaxial strength properties of frozen rock is explored；and the strength properties of sandstone and coal samples under the same confining pressure at different temperatures and different confining pressures at different freezing temperatures are analyzed；and the identity and discrepancy of two rock samples on freezing temperature are comparatively studied. Due to the internal structural difference，the frozen effects of sandstone and coal exist obvious difference. Frozen water-rich sandstone is more sensitive to temperature than that of coal. Strength of the water-rich rocks increases with the decrease of temperature which is mainly due to the peak intensity of rocks greatly improved by mineral contraction and ice strength and frost heave force with temperature decreasing. The result provides some references for studying rock mechanics under cold environment and the construction and design for freezing shafts of coal mines.
