DETERIORATING CHANGE RULE TEST RESEARCH OF DAMAGE SANDSTONE STRENGTH UNDER WATER-ROCK INTERACTION
DENG Huafeng1，2，XIAO Zhiyong1，LI Jianlin1，2，HU Yayun1，ZHOU Meiling1
(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area，Hubei Province，China Three Gorges University，Yichang，Hubei 443002，China)
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.
朱兴华，崔 鹏，葛永刚. 汶川地震对震区河流演化的影响[J]. 长江科学院院报，2012，2(1)：1-6.(ZHU Xinghua，CUI Peng，GE Yonggang. Numerical simulation of flow and sediment transport in the early stage of Three Gorges reservoir operation[J]. Journal of Yangtze River Scientific Research Institute，2012，2(1)：1-6.(in Chinese))
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2015, Vol. 34 
