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Experimental Study on Multistage Seismic Damage process of Bedding Rock Slope: A Case Study of the Xinmo Landslide

Journal of Earth Science 2024年第5期35卷 1594-1612页

作者： Jing-Jing Tian Tian-Tao Li Xiang-Jun Pei Jian Guo Shou-Dao Wang Hao Sun Pei-Zhang Yang Run-Qiu Huang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Department of Civil Engineering Panzhihua University Power China Chengdu Engineering Corporation Limited

In the early hours of June 24, 2017, a major landslide event occurred in Xinmo Village, Sichuan Province, China. The landslide instantly devastated the whole village. Ten people died and 73 were missing in this major landslide event. The study area has suffered from several strong earthquakes in the past 100 y. Present studies have reported that the cumulative damage effect of the Xinmo landslide induced by earthquake is obvious. In this study, we conducted a shaking table test based on the detailed geological survey, historical seismic data, satellite optical image, unmanned aerial vehicle photography. The test result presents the characteristics of multistage seismic damage and progressive deformation process of the Xinmo landslide model, and shows that the historical earthquakes have caused serious damage to the interior of rock mass in the source area. The test also shows that the cumulative damage of the model increases with an increase in duration of earthquake loading. When the excitation intensity increases to a certain value, the damage accumulation velocity of the model suddenly increases. It reveals that frequent historical earthquake loads can be regarded as a main reason for the damage and deterioration of landslide rock mass. Damage accumulation and superposition occur in the slope. Under a long-term gravity, deformation of the slope gradually increases until catastrophic failure is triggered. The progressive deformation process of slope is summarized. Firstly, under strong earthquakes loading, a tensile fracture surface forms at the rear edge of the wavy deformation high and steep bedding slope. It reaches a certain critical depth and expands along the interlayer structural plane. Meantime, damaged fissures perpendicular to the structural plane also appear in the steep-gentle turning area of the slope. Secondly, under a coupling action of seismic loading and gravity, the interlaminar tensile crack surface at the rear edge of the slope extends to depth

关键词： Xinmo landslide damage evolution mechanism progressive deformation process engi-neeringgeolgoy

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