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首页> 外文期刊>Arabian Journal for Science and Engineering >Dynamic Response and Failure Mode of Slopes with Horizontal Soft and Hard Interbeddings Under Frequent Microseisms
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Dynamic Response and Failure Mode of Slopes with Horizontal Soft and Hard Interbeddings Under Frequent Microseisms

机译：频繁微地震作用下水平软硬互层边坡的动力响应与破坏模式

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摘要

Slopes with soft and hard interbedded strata are widely distributed in the Three Gorges Reservoir area of China. The repeated frequent microseisms induced by the Three Gorges Reservoir may cause dynamic fatigue instability because of damage accumulation. The dynamic response and deformation process of slopes with horizontal soft and hard interbeddings under frequent microseisms are analyzed in this study by shaking table test. Horizontal seismic loading is loaded nearly 2000 times to simulate frequent earthquake actions, and the loading scheme is divided into five stages. Results show that a strong earthquake leads to a fast slope damage and a high damage degree. The amplification coefficients of peak ground acceleration at different stages exhibit decreasing trends, which imply that damage accumulates continuously with the increase in loading times. Two slide surfaces can be observed in the failure process of the model slope during the instability evolution process. Slide surface 1 is formed along the slope back end and presents a failure mode of sliding-fracturing. Slide surface 2 is formed along the slope surface and demonstrates creep pressure-induced fracturing. The slope finally loses its stability along slide surface 2. The research results are significant to the understanding of the formation mechanism of reservoir landslides and the prevention of disasters.
机译：在中国三峡水库地区，软硬叠层的斜坡分布广泛。由三峡水库引起的反复频繁的微地震可能会由于损伤累积而引起动态疲劳不稳定。通过振动台试验分析了频繁微地震作用下水平软硬互层的边坡的动力响应和变形过程。水平地震荷载被加载近2000次，以模拟频繁的地震作用，并且荷载方案分为五个阶段。结果表明，强地震会导致快速边坡破坏和较高的破坏程度。在不同阶段，地面加速度峰值的放大系数呈现下降趋势，这意味着损伤随着载荷时间的增加而不断累积。在失稳演化过程中，模型坡度的破坏过程中可以观察到两个滑动面。滑动表面1沿斜面后端形成，并呈现出滑动断裂的失效模式。滑动表面2沿着倾斜表面形成，并表现出蠕变压力引起的断裂。斜坡最终在滑坡面2上失去了稳定性。研究结果对于了解水库滑坡的形成机理和防灾具有重要意义。

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