| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 100 === Flume experiment were employed to examine granular collapses by using ballistic mill stone. The flow characteristics and pore water pressure variation during the collapse of particle piles are analyzed. The effect of aspect ratios of the granular piles under different water content both saturated and unsaturated, is examined by measuring the dynamic pore water pressure and the flow characteristics.
Aspect ratio (a=hi /?i), sliding speed and passive failure are all related to the thickness of the fluidization. Both the deposit geometric morphology and landslide process depend on basal conditions, sill height, aspect ratio and water content. The dry granular flow velocity profiles can be described by the Super Stable Heap(SSH) model. While in the saturated granular flows, the velocity profile can be described by Bagnold rheology. The variation of pore water pressure is associated with the particle collapse patterns. Heavy rainfall induced infiltration increases the pore water pressure and may cause slope collapse.
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