Mechanical characteristics of red sandstone under cyclic wetting and drying

The bank slope of the Three Gorges Reservoir is affected by seasonal water level fluctuations, which leads to deterioration rock mass, resulting in a series geological disasters such as landslides and mudslides. Therefore, thoroughly understand degradation mechanism mechanical characteristics under wetting–drying cycles, uniaxial compression tests triaxial were used reveal relationship between cycles. results show that with increase number declining trend, compaction stage sample increases considerably. It was found first ten cycles have greater impact on red sandstone condition, parameters deviatoric stress, elasticity modulus dropped rapidly 10 then tend be stable. Based testing data cycle statistics damage constitutive model modified has high degree fit test data, indicating can better reflect after This understanding process provide theoretical guidance for protection dangerous slopes drawdown zone Reservoir.