大坑地區地滑之研究; Landsliding Potential Analysis on Takeng Area, Taichung

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Title:	大坑地區地滑之研究;Landsliding Potential Analysis on Takeng Area, Taichung
Authors:	張雲翔;Yun-Xian Chen
Contributors:	應用地質研究所
Keywords:	邊坡穩定;GIS;Landslide
Date:	2004-06-25
Issue Date:	2009-09-22 09:58:46 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	論文內容提要：　　台灣地區地殼變動迅速、地震頻繁、河川坡度大；加上氣候屬於亞熱帶，加速了地表岩石的風化和侵蝕，也隱藏著許多的災害潛勢。因此區域性山坡穩定評估，對於工程規劃及邊坡防災級具參考價值。本研究以邊坡穩定分析針對可能造成邊坡破壞的潛在因子進行評估，分析該區域山崩的潛在可能性。本研究嘗試以統計方法將山崩潛感因子之評分及權重予以量化，並利用地理資系統處理大量的空間資料，以建立一套合理、可靠以及效率高的區域性山坡穩定評估方法。本研究利用數值地形圖、地質圖及野外施密特錘量測，及相關的資料文獻萃取出影響山崩的潛感因子並給予量化，再利用山崩資料進行反算分析，進而獲得各因子之評分與權重，再將所得之因子評分與權重利用不安定指數法進行疊加計算，求得本研究區之山崩潛感圖。其分析觀念即是針對於每一個網格點給定(x,y,z)值，其中x、y為座標值，z則為各點的因子評分，疊加時則是將相同位置的z值進行權重的加級運算，最後每一個座標點上將有一個新的z值，而此值即為山崩潛感值，並繪製出山崩潛感圖。研究結果顯示，研究區域中西側山崩主要受斷層作用的影響，東北方主要由為岩性所控制，而山崩潛感圖中央及東側則是以侵蝕溝影響較為劇烈。研究區域中之岩性強度資料，因採取施密特錘回彈值加以估算，所繪得之強度分佈圖約略與山區稜線一致，由此可以表示當岩性強度較大時不易受到河流的侵蝕，在地形圖上表現出來的是稜線地形，定量上則反映出區域內高岩性強度的分佈。 Frequent crustal movements and subtropical climate lead to the high sliding potential of many slopes in Taiwan, area slope stability analysis offers valuable design data to urban planning and large scale engineering projects. This study aims to analyze the factors that will contribute to sliding potential respectively, and an integrated evaluation is proposed for Takeng, Taichung. Factors with different grading and weighting are quantified statistically, GIS is used to process large spatial data, and a practical and efficient method in evaluating area slope stability is presented. Factors contributing sliding potential are extracted from topographic maps, geologic maps, and all the available sources. Field geological investigation and Schmidt hammer impact tests are conducted as an assistance. Grading and weighting of the factors are quantified by inverse analysis, all the data are then proceed to a further integrated calculation to obtain the landslide susceptibility map of the area. The basic concept in the analysis is to set each grid point as (x,y,z) where x and y are the coordinates, z is the evaluating grade of a certain factor. By integrating all the effects from other factors, a new z-value representing its sliding potential grade will thus be obtained. Study results show that the sliding in the middle and west parts of the area is mainly affected by fault structure, that in the northeast part is highly related to rock properties, while sliding in central and east parts is the results of strong weathering and erosion. Rock strengths in the area are evaluated from Schmidt hammer rebound values, high rock strength distribution lies in the locations with topographic highs. The result show that the high topography can be reflected as high rock induration.
Appears in Collections:	[Graduate Institute of Applied Geology] Electronic Thesis & Dissertation

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