Aiming to understand the dynamic disintegration and transport behavior of an earthquake-induced landslide, a dynamic discrete element method has been employed to analyze the Wangjiayan landslide triggered by the 2008 Ms 8.0 Wenchuan earthquake. Absorbing boundary condition is used for the seismic wave transmission and reflection at the slope base. The numerical results show that under seismic loading, internal rock damage initiates, propagates, and coalesces progressively along the weak solid structure and subsequently leads to fragmentation and pulverization of the slope mass. This can be quantitatively interpreted with the continuously rapid increase of the damage ratio and sudden decline of growth ratio of the number of fragments after the peak seismic shaking. During emplacement evolution, fragmented deformation patterns within the translating joint-defined granular assemblies are affected by the locally high dilatancy with a simultaneous occurrence of highly energetic collisions related to the action of shearing, and this can be quantified by the enhancement of particle kinematic activities (high vibrational and rotational granular temperatures) and intense fluctuations of location-dependent global dispersive stress. In this process, slope destabilized and transports downward in a rapid pulsing motion as friction bonds are locally and continually overcome by the seismic- and gravity-induced shear forces. The joint-determined fragment network before movement initiation and the final fragmented depositions after the rapidly sheared transport have been systematically investigated by fragment statistics (fragment size distribution, fragment mass distribution, and fractal dimension) and morphometric characters (fragment shape isotropy) to offer new insights into the disintegration characteristics of the earthquake-induced catastrophic mass movements.

中文翻译：

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伴随地震滑坡运输的动态崩解过程

为了了解地震诱发滑坡的动力崩解和运移行为，采用动态离散元方法对2008年汶川8.0级地震引发的王家岩滑坡进行了分析。边坡基础上的地震波传输和反射采用吸收边界条件。数值结果表明，在地震荷载作用下，内部岩石损伤沿弱固体结构开始、扩展和合并，从而导致边坡体的破碎和粉化。这可以用地震震动峰值后破坏率的持续快速增加和碎片数量增长率的突然下降来定量解释。在阵地演变过程中，平移关节定义的颗粒组件内的碎片变形模式受到局部高剪胀的影响，同时发生与剪切作用相关的高能量碰撞，这可以通过粒子运动学活动（高振动和旋转）的增强来量化颗粒温度）和位置相关的全球分散应力的剧烈波动。在这个过程中，由于摩擦力被地震和重力引起的剪切力局部并不断地克服，斜坡不稳定并以快速脉冲运动向下输送。运动开始前的联合确定的碎片网络和快速剪切输运后的最终碎片沉积已经通过碎片统计（碎片大小分布，