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Title: | 蘭台地區之演化與破壞機制分析 Landslide Evolution and Analysis of Failure Mechanism in LanTai Area |
Authors: | Yao-Hsein Tseng 曾耀賢 |
Advisor: | 林美聆 |
Keyword: | 蘭台地區,大規模崩塌潛勢,崩塌演化,邊坡穩定,FLAC, Lantai area,Large-scale landslide,Evolution of landslide,Stability of slope,FLAC, |
Publication Year : | 2019 |
Degree: | 碩士 |
Abstract: | 台灣處於地質年代較年輕之地區,山高谷深,又常受到颱風及地震之災害侵襲,導致山坡地災害事件頻傳,導致人民安全財產受到威脅,其中又以大規模崩塌造成更嚴重之災害,故近年來對此議題之關注度漸漸提高。
宜蘭太平山地區之宜專一線為宜蘭縣通往太平山森林遊樂區之重要觀光道路,但在經過前人調查發現此區路面開裂、樹木傾倒向下坡之現象明顯,又在13.5公里處可觀察到一處崩塌,故在經初步調查後,科技部、水保局先後對此區進行大規模崩塌之監測以及分析其滑動機制,發現本區除有大規模崩塌之潛勢外,可能有構造帶通過,使其破壞機制更為複雜。 故本研究先使用高精度數值地形進行構造帶之定位,進行現地調查以確認其位置,後利用鑽孔取樣進行試驗取得弱帶剪力強度參數外,亦進行鑽孔判釋並加入斷層帶以建立地層剖面,並蒐集各時期之DEM及前後期影像後選取該時期最主控之剖面建立模型,結合地下水位資料、試驗取得之材料參數輸入有限差分軟體FLAC,找出崩塌潛勢區域之滑動弧位置及深度,將分析結果與後期影像、夏國強(2016)判釋之潛勢區進行比對並討論,討論研究區之演育發展情形外及破壞機制。 本研究發現在各時期之情境模擬情形下,可以找出斷層對研究區之影響程度,隨著地下水面的抬升,斷層對研究區之穩定性影響逐漸顯現出來,經過前述之判釋結果、影像及鑽孔破碎帶位置進行滑動弧之深度、冠部及趾部位置之比對,以驗證各分析情境下所得結果之合理性。 Taiwan, locating in a young geological area, has high mountains and deep valleys, and is often struck by typhoons and earthquakes. This leads to landslide incidents which endanger people’s lives and properties. Among different types of landslides, the deep-seated landslides were more catastrophic than others. Yilan Special Route NO.1, is the only road to the Taipingshan National Forest Recreation Area. Literature surveys indicated that road has tension cracks and the wood topple toward downhill grade. A landslide area at the 13.5K on Yilan Special Route NO.1 was identified. The landslide monitoring and sliding analysis done by MOST(2015~2017) and SWCB(2018) indicated that in addition to a potential deep-seated landslide, a geological structure might pass through this area, resulting in the complexity of the failure mechanism. In this study, we used high-resolution DEMs to locate the geological linear structure. Field investigations were conducted to confirm the geological structure’s location and attitude. Samples obtained from the borehole were tested for the material properties. Moreover, we interpreted the borehole logging incorporated with the location of the fault to establish the ground profile. In order to find the potential failure zone, crown and toe area, we collected DEMs, aerial photos, SPOT and satellite images to combine with the ground water data and the material properties to construct slope model for numerical analysis (FLAC). The results were compared to the previous results done by Hsia (2016) to investigate how the research area evolved and its failure mechanism Through time series simulations, with the variation of the groundwater, the effects of the fault on the stability of the slope can be evaluated. Finally the sliding depth and the location of the crown and toe were mapped back to the interpreted results to validate the simulation results. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74075 |
DOI: | 10.6342/NTU201903205 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 土木工程學系 |
Files in This Item:
File | Size | Format | |
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ntu-108-1.pdf Restricted Access | 23.24 MB | Adobe PDF |
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