Abstract：A series of uniaxial compression creep tests on dry，saturated sandstones，and the sandstones with hydro-physico-chemical influencing effects due to the circulating flow of different hydro-chemical solutions are conducted. Based on the test results，the strain versus time relations，instantaneous strains，creep strains and creep rates of dry and saturated sandstones under different stress levels are compared；and the hydro-physical influencing effects and mechanisms of saturated sandstone are derived. Furthermore，the differences of creep strain versus time relations，creep strains，instantaneous strains and creep rates of the sandstones with hydro-physico-chemical influencing effects due to the circulating flow of different hydro-chemical solutions are systematically and originally researched respectively. The influencing effects of ion concentrations and pH values of the different hydro-chemical solutions are revealed；and the corresponding mechanisms of hydro-physico-chemical actions are investigated. The research demonstrates that the creep behavior of saturated sandstone is more obvious than that of dry sandstone，while the creep behavior of the sandstones with hydro-physico-chemical influencing effects due to the circulating flow of different hydro-chemical solutions are larger than those of dry and saturated sandstones. The creep behavior of saturated sandstone is affected dominantly by the hydro-physical action. The creep behavior of the sandstones due to the circulating flow of different hydro-chemical solutions has both the hydro-physical and hydro-chemical influencing effects. The larger the creep behaviors of sandstones are，the stronger the ion concentrations of the hydro-chemical solutions are. This paper has a useful reference to the theoretical and applied research in the field of rock rheological mechanics and water-rock interaction.
