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Abstract In view of the case that the slope rock mass after earthquake was frequently destroyed under the condition of rain or immersion for reservoir，typical sandstone was chosen as the research object to test under the condition of cycling loading and unloading first and circulating soaking-drying. Besides，the degradation mechanism of the sandstone was studied at length. The experiment results show that：(1) The plastic deformation and internal damage of rock were not only caused by slippage of mineral grains surface but deformation and failure of local contact in cycling loading and unloading；(2) The degradation of compressive strength and shearing strength was obvious in process of circulating soaking-drying which showed obvious time effect and heterogeneity；(3) Compared with the complete sample，the degradation speed of damage rock sample is faster，which means coupling damage effect of damage rock is obvious and can better explain why some slope after earthquake were instability under several times of cycling soaking-drying and raining.
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2015, Vol. 34 
