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首页> 外文期刊>Natural hazards and earth system sciences >Particle flow and segregation in a giant landslide event triggered by the 2008 Wenchuan earthquake, Sichuan, China
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Particle flow and segregation in a giant landslide event triggered by the 2008 Wenchuan earthquake, Sichuan, China

机译：2008年汶川地震引发的一次巨大滑坡事件中的粒子流和分离

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摘要

During the 12 May 2008 Wenchuan earthquake, a large landslide of approximately 30 million m~3 occurred at Donghekou with a particle run-out distance of over 2000 m. This paper presents fascinating particle flow and segregation characteristics in the landslide process found through field investigation of changes in the soil particle size, density, and fabric along the particle movement paths. The soil particles experienced projection, long-distance flying, sliding, and rolling. Trajectory segregation, inverse grading, and particle crushing were found in the landslide event, which contributed to the heterogeneity of the soil deposits. In the initial deposition area, particles with larger diameters appeared to have flown longer. Materials from different sources mixed, forming more uniform debris. In the run-out area, the particle flow tended to cause large particles to travel further. However, particle disintegration and crushing led to more small particles along the movement paths and the observed characteristic flow distances of very large particles did not increase with the particle diameter, which is different from observations of an idealized granular mass flow.
机译：在2008年5月12日的汶川地震中，东河口发生了约3000万m〜3的大型滑坡，颗粒跳动距离超过2000 m。通过现场调查沿颗粒运动路径的土壤粒径，密度和织物的变化，本文介绍了滑坡过程中引人入胜的颗粒流动和偏析特征。土壤颗粒经历了投射，长距离飞行，滑动和滚动。在滑坡事件中发现了轨道偏析，反梯度和颗粒破碎，这有助于土壤沉积物的异质性。在初始沉积区域中，直径较大的颗粒似乎流动的时间更长。来自不同来源的材料混合在一起，形成更均匀的碎片。在跳动区域中，颗粒流倾向于导致大颗粒进一步传播。然而，颗粒的崩解和破碎导致沿着运动路径的更多的小颗粒，并且观察到的非常大的颗粒的特征流动距离并未随粒径的增加而增加，这与理想化颗粒质量流的观察结果不同。

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