Mechanism of Earthquake-Induced Bedding Buckling and Tension Landslide in Three-Rivers Basin: Test and DEM Modeling

Chen Wang and Xue-Liang Chen ()
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Chen Wang: Institute of Geophysics, China Earthquake Administration
Xue-Liang Chen: Institute of Geophysics, China Earthquake Administration

A chapter in Proceedings of the 11th Annual Meeting of Risk Analysis Council of China Association for Disaster Prevention (RAC 2024), 2025, pp 101-107 from Springer

Abstract: Abstract In the Three-rivers basin of the Qinghai-Tibet Plateau, bedding rock slopes frequently experience landslide disasters. Buckling and tension cracking are common failure modes of these bedding rock landslides, yet the mechanisms of crack propagation remain unclear. This study utilizes shake table experiments and discrete element analysis to investigate the dynamic characteristics and crack propagation mechanisms of the “Xiaguiwa” bedding rock landslide under earthquakes. A Voronoi diagram damage discrete element model was developed based on the shake table model for the bedding rock slope. Arias intensity and Hilbert-Huang Transform (HHT) energy methods were used to analyze the dynamic characteristics and damage mechanisms of the “Xiaguiwa” landslide. Numerical methods were employed to assess displacement, shear, and tensile crack propagation. Results indicate that seismic tensile forces led to the destruction of the slope’s top deposit layer, with buckling failure first occurring at 1/4 elevation of the bedding rock slope. Buckling induced high-frequency energy surges, exceeding 40 Hz. Subsequently, shear deformation emerged at the rear edge, extending down along structural planes. This process coincided with a concave formation at half- elevation. The accumulation layer displayed varying impacts on seismic energy across different elevations, particularly amplifying low-frequency ( 40 Hz) seismic energy. The rock structure, slope angle, and dip angle not only influence slope dynamics but also alter the instability mode of bedding rock slopes, with smaller dip angles resulting in greater instability. Shear and tensile cracks are interdependent, as shear cracks consistently emerge and propagate along tensile cracks. This study elucidates the dynamic characteristics and crack propagation mechanisms of bedding rock landslides, providing valuable insights for the study of crack propagation in jointed slopes.

Keywords: Modeling Test; Crack Propagation; Rock Landslides (search for similar items in EconPapers)
Date: 2025
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DOI: 10.2991/978-94-6463-946-9_13

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