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| Autor: | TZU-I Huang, 黃子益 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 The mobilization process of a granular pile and the associated debris flow by the action of upstream runoff and seepage was experimentally investigated in an inclined flume. The critical condition and the failure process of the granular pile were analyzed by employing the PIV approach. The effect of runoff discharge, flume slope and permeability are explored. During the mobilization process, a partially unsaturated granular snout was formed, then became a bulge at the surge front just as stony debris flows in the field. The velocity profile in the unsaturated snout depicts a Bagnold’s rheology, but it deviates slightly from Bagnold’s profile due to presence of bottom slipping in the intermediate saturated zone. In addition, the evolution of solid fraction indicates that the critical failure condition is controlled by the seepage flow. The pore pressure sensors couldn’t accurately reflect the magnitude of impact force upon the vertical wall since the approaching granular flow is unsaturated and the particle impact can not be fully transformed into the dynamic pore pressure. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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