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为探究库岸边坡岩体的损伤特性,以常见的中风化砂岩为例,通过室内长期浸泡、干湿循环条件下的力学试验,分析了砂岩的物理参数、应力—应变曲线及劣化特征。结果表明,长期浸泡对岩样的损伤作用分为前期的饱和作用和后期的水解作用;干湿循环的每个周期都会造成岩样小颗粒脱落或胶结物溶解。长期浸泡、干湿循环两种状态对岩样的损伤都很大,且首次损伤程度较大,占整体损伤的一半以上。研究结果为库岸边坡的稳定性研究提供了理论依据。
In order to explore the damage characteristics of bank rocks on bank slope, taking the common weathering sandstone as an example, the physical parameters, stress-strain curve and deterioration characteristics of sandstone were analyzed through long-term indoor immersion and wet-dry cycling mechanical tests. The results show that the damage effect of the long-term immersion on the rock samples is divided into the pre-saturation effect and the post-hydrolysis effect. Each cycle of the wet-dry cycle will cause the rock particles to fall off or dissolve the cement. Long-term soak, wet and dry cycle of the two states of the rock specimen damage are large, and the greater the degree of injury for the first time, accounting for more than half of the overall damage. The results provide a theoretical basis for the stability of bank slope.