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題 名 | 由地質環境特性探討苗栗鹿場地區邊坡不安定性之原因=Investigations of Influence Factors on the Slope Instability of Luchang Area, Miaoli Based on the Characteristics of Geological Environment |
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作 者 | 李準勝; 段錦浩; 吳志展; 黃松光; | 書刊名 | 水土保持學報 |
卷 期 | 41:4 2009.12[民98.12] |
頁 次 | 頁437-453 |
分類號 | 434.278 |
關鍵詞 | 鹿場地區; 地質環境; 邊坡不安定性; Luchang area; Geological environment; Slope instability; |
語 文 | 中文(Chinese) |
中文摘要 | 山坡地各種地質災害發生,是台灣本島大多數居民所必需面對的問題,然而對所居住地質 環境瞭解的不足是最大問題,所以本研究的目的旨在藉由地質學知識來探討居住地區的地質環 境特性。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。最後,本研究也提出兩個重要訊息,(1)當豪大雨連續降雨量達1250 公釐以上,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;(2)鹿場溪為近代 演化發育較鹿湖溪和風美溪晚的河流,向源侵蝕和側蝕相當發達,對鹿場臺地東側河岸邊坡穩 定影響很大,為未來整治首要重點。 |
英文摘要 | Various kinds of geological disasters of hill slopes must be faced for most of people in Taiwan. However, the deficiency in understanding the geological environments is still a big issue. The purpose of this paper is to explore the geological environments by using knowledge of geology. The study site is Luchang Area of Miaoli, Taiwan. The characteristics of geological environment of this site are steep land, high stream-flow velocity, and strong geological activities. The results of this study showed that the influencing factors of slope instability for 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 parts of slide-failure can be recognized from geological profile model. One is potential slide-plane for dip-direction slopes, another is slide-surface at the colluvium near the side of Luchang river. Finally, this study provided two important messages: (1) The large landslide will occurr when the accumulated precipitation was greater than or equal to 1250mm and the cracks were spreading at central Luchang Area; (2) Because the age of channel evolution of Luchang river is younger than Luhu river and Fongmei river, the headward and sideward erosion are especially significant for Luchang river. The mitigation of Luchang river will be suggested in the future. |
本系統中英文摘要資訊取自各篇刊載內容。