Abstract: In order to explore the creep law of rock under the coupling action of hydration, freezing and thawing, taking the marble of an open-pit slope in Hubei as the research object, the uniaxial compression creep tests under different freeze-thaw cycles were carried out by soaking in acid, medium and alkali solutions, and the macro failure morphology and fracture micro characteristics of marble were compared and analyzed. The results showed that: 1) Under the same number of freeze-thaw cycles, the instantaneous, creep strain and creep rate in acidic environment were the largest, alkaline was the second, and neutral was the smallest. 2) The average long-term strength of marble was 0.685-0.812 of the instantaneous strength, and the long-term strength was greatly reduced. 3) The damage degree of acid solution to marble particle structure was stronger than that of alkaline solution, but with the enhancement of freeze-thaw effect, the damage degree of alkaline solution to rock structure was gradually close to that of acid solution.

Key words: hydrochemistry, freeze thaw cycle, marble, creep, damage, fracture