斜坡滑動土體底部之流體化過程研究; The mobilization process of landslide blocks at different slopes

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题名:	斜坡滑動土體底部之流體化過程研究;The mobilization process of landslide blocks at different slopes
作者:	張藝耀;Yi-Yao Chang
贡献者:	土木工程研究所
关键词:	顆粒流;顆粒溫度;土石流;侷限顆粒;debris flow;granular temperature;granular flow;confined granular material
日期:	2009-07-09
上传时间:	2009-09-18 17:05:45 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本文探討引發山崩的因素，以及山崩的土體滑動過程中之破壞特性與與能量傳輸機制，探討斜坡土體崩解底部流體化過程，以期對於坡地災害防治能有所貢獻。本文從邊坡的穩定、受地震破壞之流體化特性、侷限顆粒之壓力特性，並由侷限顆粒流體化實驗探討山崩的土體滑動過程中之崩解機制。本文設計出侷限顆粒同步實驗，使侷限顆粒之運動可視為獨立運動，以更接近滑動塊體的崩解運動。本文發現流體化層顆粒具滾動特性而非滑動，這特性明顯降低侷限顆粒體摩擦組力，流體化層的厚度對侷限顆粒體摩擦阻力有顯著的影響，單層流體化層之侷限顆粒體的摩擦阻力明顯高於俱多層流體化層侷限顆粒體。侷限顆粒體底部顆粒的運動可分為兩個階段，第一階段由滑動發展為滾動，摩擦係數隨著速度增加而遞減；第二階段為滾動狀態並發展出流體化層，摩擦係數隋著速度的增加而增加，為線性變化。底部的開口越大流體化層越厚，整體顆粒的運動速度越快，實驗發現局限顆粒流體化層最高可達四層。 The slope failures and the mobilization process of landslide blocks at different slopes are examined in this study by employing both theoretical analysis and experimental work to be helpful for the prevention and prediction of slope hazard mitigation. The study includes slope stability analyses, the fluidized mechanism of the landslide mass at bottom and the pressure analyses of confined dry granular material at bottom in order to know the mobilization process of landslide blocks. The mobilization process of landslide blocks at different slopes are examined by experimental work and theoretical analysis in this study. A special synchronized observation system for the mobilization block is developed in this study. The bottom mobilization process has two stages. The first stage is the slide development and the second stage is dominated by the rolling mechanism. The mobilization process is controlled by the failure zone (i.e. the open slit) near the bottom. Larger failure zone will generate faster failure process. The mobilization process initiates around 0.5 -1.0 second after the movement. The granular temperature is mainly intensified in the fluidized zone, which is about 4 particles in thickness.
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