Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34619
標題: 苗栗鹿場地區地質環境特性與邊坡穩定敏感度分析之研究
The Characteristics of Geological Environment and the Sensitivity Analysis of Slope Stability of Luchang Area, Miaoli
作者: 李準勝
Lee, Chun-Sheng
關鍵字: Luchang Area;鹿場地區;Geological Environment;Slope Instability;Sensitivity Analysis;地質環境;邊坡不安定性;敏感度分析
出版社: 水土保持學系所
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摘要: 
台灣本島的地質環境特色,由於先天的地質條件不佳,頻繁地震侵擾,以及每年颱風季節密集性豪雨侵蝕之下,常造成各種山坡地地質災害。本研究是以苗栗鹿場地區為研究場址,其特性為一個山高坡陡、水短流急和地質作用強烈的地質環境。本研究的目的旨在藉由地質學觀點來探討鹿場地區 (1) 地質環境特性、(2) 邊坡不安定之原因、(3) 邊坡穩定敏感度分析等三個部份的研究,其成果可以供未來對鹿場地區水土保持規劃整治之參考。
本研究結果顯示,鹿場地區地質環境之不安定原因,有西側岩壁落石、厚崩積土體、順向坡平面滑動、河道的向源侵蝕和側蝕、地下水滲流快速等;就所建構地質模型可以瞭解,鹿場地區可能的滑動面有兩部份,一為潛在的順向坡平面滑動面,另一為在鹿場溪河岸崩積層邊坡內的滑動面。當連續降雨量達1250mm以上,且鹿場臺地發生張力裂縫時,為發生大規模地滑災害的重要徵兆。六種土體參數對安全係數之敏感度大小順序為水平地震力係數(Kh)>土壤摩擦角(ψ)>地下水位變動(WT)>垂直地震力係數(Kv)>土壤凝聚力(C)>土壤單位重(rt)。由過去鹿場地區發生過的地震震度條件(四級含以下的地震震度,包含集集大地震的記錄),推論鹿場臺地崩積土體的摩擦角(ψ)應可以大於35度以上,但發生六級以上的地震震度則對鹿場臺地將可能發生邊坡穩定破壞情形。

The characteristics of geological environment of Taiwan include frequent earthquake, abundant rainfall, and strong erosion, thus leading to various of geological disasters. The study site is Luchang Area of Miaoli, NW Taiwan. The geological environment of this site is a steep land with high stream-flow velocity and strong geological activities. The purpose of this paper is to explore (1) the characteristics of geological environment, (2) the reason of the unstable slope and (3) the sensitivity analysis of slope. Future mitigation plan of the study area can then be derived.
The results of this study showed that the influencing factors of slope instability for the Luchang Area include rock fall at the west slopes, thick colluvium, sliding planes for dip-direction slopes, headward and sideward erosion of channel, as well as fast seepage of ground water. Two slide planes were recognized from geological profile model. One is potential slide plane on the dip-directional slope, another plane is located in the colluvium near Luchang river sides. Large landslide will occur when the continuous accumulated precipitation was greater than or equal to 1250mm, and tensional cracks occurred at central Luchang terrace. The degree order of sensitivity analysis for six parameters of soil dynamics versus safety factor are horizontal seismic coefficient (Kh)>soil friction angle (ψ)>water table (WT)>vertical seismic coefficient (Kv)>cohesion (C)>unit density (rt). After revealing past earthquake data (mostly with intensity < 4, as well as Chi Chi earthquake), the soil friction angle of the site is concluded to be greater than 35 degrees, slope failure of the site will occur when the intensity of earthquake approaches to 6.
URI: http://hdl.handle.net/11455/34619
其他識別: U0005-0408200818131700
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