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Numerical investigation of rock dynamic fragmentation during rockslides using a coupled 3D FEM-DEM method

Journal of Mountain Science 2022年第4期19卷 1051-1069页

作者： LIU Yang WENG Lei CHU Zhao-fei School of Civil Engineering Wuhan UniversityWuhan 430072China

rockslides are one of the most common geological hazards in mountainous areas and can pose significant threats to the safety of human lives and infrastructures. Studying the dynamic fragmentation process, and fragment characteristics of rock blocks during rockslides is of great significance. In this study,the influences of the slope angle on the dynamic fragmentation process, damage and energy evolution,and the fragments’ flying velocity and flying angle were systematically investigated using a coupled 3D FEM-DEM method. An improved fragment search algorithm was first proposed to more effectively extract the information of the fragments after impacting. The input parameters in the numerical modeling were carefully calibrated based on the quasi-static uniaxial compression tests and the rockimpact tests. The complex fragmentation process of rock block sliding along an inclined slope was simulated. The results indicate that the fragmentation intensity gradually increases with increasing the slope angle, and the fragmentation intensity of the front region of the rock block is always higher than that of the rear region. Additionally, the slope angle can significantly affect the damage ratio, energy dissipation, and the ratio of tensile crack to shear crack during the rockslides. The number of the fragments having higher flying velocities and larger flying angles increases with increasing the slope angle,which contributes to a larger spreading distance and a wider deposition area.

关键词： rockslides Dynamic fragmentation Fragment characteristics 3D FEM-DEM Numerical modelling

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Dynamic behaviors of rockslides subjected to brittle failure of locked segments

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Journal of Mountain Science 2023年第2期20卷 532-541页

作者： HU Kai ZHAO Xiao-yan ZHANG Guang-ze Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China China Railway Eryuan Engineering Group Co. LtdChengdu 610031China

Locked segments are recognized as a critical role that controls the stability of rock slopes but remain an unclear and challenging problem with respect to their role incorporated into the failure mechanism.In order to study the effect of the locked segments on the initial failure process of rockslides,thirty-six groups of locked segment specimens with three different lithologies were prepared,direct shear tests were carried out to obtain the accelerations caused by brittle failure of the locked segment specimens.Experiment results showed that the maximum accelerations caused by the brittle failure of locked segment specimens was 2.91 g in the horizontal direction,and 3.18 g in the vertical direction.We took the Wangjiayan rockslide in 2008 Wenchuan earthquake as an example,the critical balance condition of the sliding mass under combined effect of gravity and accelerations induced by brittle failure of locked segment was analyzed,which indicated that the initial failure process of the Wangjiayan rockslides was notably influenced by the existence of the locked segment.The departure acceleration and direction of the Wangjiayan rockslide were proposed.The study results can provide a new insight into the understanding of the initial failure mechanism of rockslides with locked segments.

关键词： rockslides Rockfalls Locked segment Direct shear test Initial failure mechanism Sudden departure Brittle failure

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