顆粒堆積體受重力及地震力作用下 之運動模擬與驗證

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71132

Title:	顆粒堆積體受重力及地震力作用下之運動模擬與驗證
Authors:	蔡一豪;TSAI,YI-HAO
Contributors:	土木工程學系
Keywords:	顆粒流;崩塌;水平振動;DEM;PFC-3D;particle flow;avalanche;horizontal vibration;DEM;PFC-3D
Date:	2016-07-22
Issue Date:	2016-10-13 12:08:09 (UTC+8)
Publisher:	國立中央大學
Abstract:	土石邊坡受到外力產生的崩落、破碎、運動、堆積等過程，對坡地的居民帶來生命財產的危險。本研究以實驗及數值分析探討在重力和地震力兩種不同的外力作用下，顆粒堆積體的運動特性並進行比較，即藉由PFC-3D數值模擬程式來驗證實驗並比對相似度，來做進一步的探討。本研究實驗除了觀察顆粒外部的流動特性，如顆粒堆幾何變化、流動高度、流動面分布、前段速度、表面角度衰減等，也有觀察其內部流動特性，如流場變化，而PFC-3D 數值模擬則可觀察其內部的接觸力、不平衡力、流動動能、摩擦耗能之變化。結果顯示實驗與模擬的物理流動特性相似，而實驗速度值較模擬值為高;顆粒堆受振動後，其表面角度衰減與理論值產生的偏差則來自顆粒性能及邊壁摩擦。;Rock falls, Rock avalanches and debris flows are devastating processes for residents living in the slope areas, which are due to the external driving forces such as gravity or seismic acceleration. Both gravity and seismic forces on the collapse of granular piles are examined in this study by numerical simulation ( PFC-3D) and experimental study. The experimental properties of granular flow characteristics such as granular pile geometry, the flow depth, shear layers, the front speed of flow and surface angle were obstained. On the other hand, the internal flow characteristics were examined by employing the PFC-3D numerical model, which is capable of finding the contact force, unbalanced force, the flow of kinetic energy and friction energy of the granular flow. The numerical results depict similar physical flow characteristics of the experiment study. However the experimental velocities were slightly greater than numerical simulation. The attenuation of surface angle of the granular pile during oscillation depends on both particle properties and side wall friction.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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