https://scholars.lib.ntu.edu.tw/handle/123456789/37198
標題: | 地震造成新山崩地質環境特性之研究─地震後新山崩之工程地質特性(Ⅰ) | 其他標題: | The Engineering Geological Characteristics of New Landslides Caused by Earthquake (I) | 作者: | 陳宏宇 | 公開日期: | 2001 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 由更新世頭嵙山層火炎山相礫石層組 成之南投九九峰,在921 地震後,產生了 大量的山崩,而南投縣九份二山地區在 921 地震當時也產生了大規模之順向坡地 層滑動。因此,本研究工作目的是在探討 礫石的形狀與排列方向對礫石層坡度的影 響,並嘗試利用實驗室內之試驗工作來瞭 解九份二山滑動面上岩石材料之工程地質 特性。這些特性包括(1)自然物理性質,(2) 岩石組構,(3)礦物成分,以及(4)力學性 質等四項工作。 由現場調查的結果顯示,九九峰之礫 石岩性主要為石英砂岩所組成,少部份為 變質砂岩,礫石顆粒的分布約佔85%,基 質中砂顆粒成份約佔14%,其餘為細顆粒 的組成。基質的液性限度為26%,塑性限 度為15%,塑性指數為11 ,比重為2.52 。 經過貫入試驗結果顯示,介於礫石間之基 質材料其強度為介於100 ∼250kg/cm 2 之 間,已達弱岩的分類標準,基質中小於 200 號篩以下的礦物有石英、高嶺土、伊 萊石以及膨潤土。而九份二山岩石樣品之 自然物理性質各項試驗結果與消散耐久 性、點荷重強度以及基本摩擦角作相互的 分析探討,其結果顯示除了點荷重強度會 著隨含水量的增加而有降低的趨勢之外, 其餘各項自然物理性質與力學性質間的相 關性並不明顯。 The 99 peaks of the Nantou area is comprised of the gravel formation of Pleistocene. During the Chi-Chi Earthquake, there were lots of landslides in the area. Lots of former study indicate that the difference of the shape, size, proportion and orientation of the gravels make the properties of the gravel material change. The major point of this study is to comprehend the relationship between the slope grade and the orientation and shape. The distribution of the gravel particles in the matrix is 85% and sand particle is 14% of the matrix in the study area. The soil classification was poorly-graded gravel (GP) according to the Unified Soil Classification System. The liquid limit of the matrix is 26%, plastic limit is 15% and the specific gravity of the matrix is 2.52. The strength of the matrix ranges from 100 to 250 kg/cm 2 . The mineral of the matrix includes quartz, kaolinite, illite and smectite. The dry unit weight of the gravel particles in the study area is 2.56 kg/cm 3 and water-absorptivity is 1.14%. Slake durability index (Id2) is 98.6 which shows the ability against weathering of the gravels is good. The large scale disaster of dip slope failure had occurred in the Juo- Feng- Err-Shan of Nantou area during 921 earthquake, and generated a length 2100m and wide 1000m relict slip surface. And this study try to use laboratory experiments to understand the engineering properties of rock materials on the slip surface. The engineering properties include 4 items: (1) physical properties, (2) rock textures, (3) mineral composition, and (4) mechanical properties. The physical properties includes 4 items: (1)water content, (2) porosity, (3)unit weight, and (4) liquid and plastic limit. The study discusses the relationship between these physical properties and slake durability properties, point-load strength and the basic friction angle. The results demonstrate that the point-load strength will decrease with the water content increase, and the other physical properties seem no relationship with mechanical properties. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11768 | 其他識別: | 892116M002044 | Rights: | 國立臺灣大學地質科學系暨研究所 |
顯示於: | 地質科學系 |
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892116M002044.pdf | 148.2 kB | Adobe PDF | 檢視/開啟 |
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