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題名 | 遽變式山崩之PFC3D模擬初探--以草嶺與小林村為例=The Catastrophic 1999 Tsaoling and 2009 Hsiaoling Landslides: Preliminary Study from 3-D Distinct Element Modeling |
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作者姓名(中文) | 唐昭榮; 胡植慶; 羅佳明; 林銘郎; | 書刊名 | 地工技術 |
卷期 | 122 2009.12[民98.12] |
頁次 | 頁143-152 |
分類號 | 354.58 |
關鍵詞 | 離散元素法; 滑行距離; 草嶺山崩; 小林村山崩; PFC; Distinct element method; Runout distance; Tsaoling landslide; Hsiaoling landslide; |
語文 | 中文(Chinese) |
中文摘要 | 本文主要是利用三維顆粒體離散元素之PFC3D軟體,深入探討草嶺於1999年因集集地震所誘發之山崩行為,並初步應用相關方法模擬2009年莫拉克颱風引致之小林村遽變式山崩事件過程。研究顯示,當集集地震導致草嶺地區順向坡滑動面之臨界滑移弱化滑動面強度,造成其殘餘摩擦係數接近0.05時,崩解之塊體才具有足夠的動能越過清水溪至倒交山位置。其最快的塊體移動速度約每秒70公尺,顆粒最遠滑行移動接近3,500公尺,整個山崩過程約160秒。而小林村初步模擬結果顯示,小林村於山崩觸發後的60秒,部份房舍可能已遭崩落的土石所掩蓋或推移至對岸;而土石滑動速度最快可達每秒50公尺,且其動能足以到達旗山溪主流之左岸(小林村對岸),並於旗山溪近小林村區域形成堰塞湖。就遽變式山崩之災害評估而言,未來三維顆粒體離散元素法配合山崩潛勢分析,可提供了解山崩之可能運動過程和推估遽變式山崩之影響範圍。 |
英文摘要 | In this study, we used 3D distinct element method (PFC3D) with granular particle assemblage to simulate kinematic process and mechanics of two catastrophic landslides in Taiwan; one was the Tsaoling landslide induced by 1999 Chi-Chi Earthquake and the other was recent Hsiaoling landslide induced by 2009 Morakot Typhoon. When the residual friction coefficient of Tsaoling landslide is equal or less than 0.05 after a critical displacement due to the Chi-Chi earthquake, the landslide block can move across the Chinshui River and deposit on Diagiaoshan. The predicted maximum velocity is greater than 70 m/sec and the longest runout distance of the particle is about 3,500 m. According to the 3D numerical simulation, Hsiaoling village might be buried in 60 seconds after the Shamdushan landslide. The predicted maximum velocity is about 50 m/sec and the debris could reach to the other side of the Chishan River. Consequently a dammed lake was formed in the Chishan River. From the viewpoint of the assessment of catastrophic landslides, and the 3-D discrete element together cooperate with the analysis of sensibility of landslide potential is a potential tool to elucidate the mechanics and kinematics of landslide process and impact area induced by gigantic landslide events. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。