Most previous studies focused on the performance of bedding rock slope under strong earthquakes, where limited publications involved bedding rock slope under microseisms. Present literatures often ignored the effect of rock joint surface shapes on slope stability and just simplified it as a planar surface, which is always not practical. In this study, shaking table test was carried out to study the dynamic behavior, damage accumulation, and failure mode of the bedding rock slope with zigzag asperities under frequent microseisms. Generally, the natural frequency decreases with the increase of loading times of earthquakes, while the damping ratio of the slope has a tendency to grow with it. Results shows that the main failure mode of model slope was integral slipping along the bedding surface, and two sliding surfaces were observed during the instability evolution process of the model slope, indicating that the deformation pattern of the sliding surface was mostly determined by undulating angles and normal stress. Besides, the cumulative damage of the slope was evaluated based on the variation of natural frequency, and the cumulative damage evolution models of slope rock mass were established respectively for stages of micro-small earthquakes and strong earthquakes. It is found that the evolution curve of cumulative damage was characterized by a tendency of slight decline to rapid growth to steady growth under micro-small earthquakes, while it followed an exponential growth trend under strong earthquakes.

中文翻译：

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频繁微震作用下顺层岩质边坡的累积破坏演化与破坏模式

以前的大多数研究都集中在强地震作用下的顺层岩质边坡方面，而在微震作用下的顺层岩质边坡方面的出版物很少。目前的文献经常忽略岩石缝表面形状对边坡稳定性的影响，而只是将其简化为平面，这始终是不实际的。在这项研究中，进行了振动台试验，以研究在频繁的微地震下具有锯齿形凹凸的顺层岩质边坡的动力特性，损伤累积和破坏模式。通常，固有频率随着地震荷载时间的增加而降低，而边坡的阻尼比则随之增大。结果表明，模型边坡的主要破坏模式为沿顺层面整体滑动，在模型边坡失稳演化过程中观察到两个滑动面，表明该滑动面的变形方式主要由起伏角和法向应力决定。此外，根据自然频率的变化对边坡的累积破坏进行了评估，并分别建立了微小地震和强震阶段边坡岩体的累积破坏演化模型。结果表明，累积损伤的演化曲线的特征是在微小地震下从快速增长到稳定增长有小幅下降的趋势，而在强地震下则遵循指数增长的趋势。表明滑动表面的变形模式主要由起伏角和法向应力决定。此外，根据自然频率的变化，对边坡的累积破坏进行了评价，分别建立了微小地震和强震阶段边坡岩体的累积破坏演化模型。结果表明，累积损伤的演化曲线的特征是在微小地震下从快速增长到稳定增长有小幅下降的趋势，而在强地震下则遵循指数增长的趋势。表明滑动表面的变形模式主要由起伏角和法向应力决定。此外，根据自然频率的变化，对边坡的累积破坏进行了评价，分别建立了微小地震和强震阶段边坡岩体的累积破坏演化模型。结果表明，累积损伤的演化曲线的特征是在小地震作用下从快速增长到稳定增长有小幅下降的趋势，而在强地震作用下则遵循指数增长的趋势。建立了微小地震和强地震阶段斜坡岩体累积损伤演化模型。结果表明，累积损伤的演化曲线的特征是在微小地震下有从快速增长到稳定增长的小幅下降趋势，而在强地震下却呈指数增长趋势。建立了微小地震和强地震阶段斜坡岩体累积损伤演化模型。结果表明，累积损伤的演化曲线的特征是在小地震作用下从快速增长到稳定增长有小幅下降的趋势，而在强地震作用下则遵循指数增长的趋势。