- 學位論文
投89線道15.85K滑動面材料參數反推分析
Back analysis about the material parameters of failed slope at 15.85K of Nantou 89th County Road
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摘要
本論文所討論之研究區位於南投縣仁愛鄉之投89線道(俗稱力行產業道路)，由於當地特殊之地質(抬升中之擾動岩盤、屬輕至中度變質岩質脆弱)及地形條件(山高谷深及陡急之邊坡)，因此岩盤極不穩定，幾乎每雨必坍；甚至於大雨過後，大量岩屑之崩落亦時有所聞。 本研究利用各事件前後之DEM數位影像，比對找出暴雨前後之地形改變，並配合暴雨當時之降雨資料及所蒐集之基地相關數據，利用數值分析程式Geo-Studio及具代表性之地形變化之地質剖面，以反推其力學參數。並以之預測基地內可能之危險邊坡，於未來面臨類似莫拉克颱風之作用下，邊坡之破壞情形。以從中尋求可能之防災策略。 本研究蒐集2008到2010年間之航空照片，經對比共可得到三處四個滑動剖面，皆未因溪溝沖刷而破壞，主要成因是由豪雨所造成之滑動。利用此四個剖面進行數值反推分析，可得到四條摩擦力及凝聚力的關係。 由反推所得之圖，可初步研判崩積層之c及φ值分別約為15KPa及26°
並列摘要
Under the adverse impact of plate tectonic activities,including folding,faulting and earthquake,the geological condition is broken and weak and is very sensitive to landslide,especially at the mountainous hillslope. The study site is located at the 15.85K of Nantou 89thCounty Road,also called Lihsing Industrial Road.This road is one of the important transportation connections of the mountainous area in Central Taiwan. By comparing the appearance difference of the aerial photos taken during 2008 and 2010. Three sliding locations and four sliding profiles can be identified. Geo-Studio is used to run the back analyses on those four profiles to obtain the friction angle and cohesion for the colluvium formation. The correlation chart of the friction angle(φ) and cohesion(c) is obtained.The φ and c from this study can be suggested as 26 and 25 KPa,respectively.
參考文獻
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