陳榮河2006-07-252018-07-092006-07-252018-07-092004-07-31http://ntur.lib.ntu.edu.tw//handle/246246/2880土石流由於發生快速及破壞力極強之特性，往往造成居民生命財產的 損失，而為避免土石流的再度發生，必須對當地發生土石流之原因進行了 解，才能選擇適當的防治方法以防止土石流的再度發生。 土石材料之特性是影響土石流發生的重要因子，而土石材料之特性又 因地域之不同而顯示不同之特徵；本研究選定之區域為民國89 年象神颱 風造成土石流之災害地點，包括台北縣金山鄉重和地區及瑞芳鎮侯硐地 區，兩地皆屬於北部地區，地質條件與以往之研究區域在中部及東部有所不同。 本研究首先透過室內試驗，對土石材料之基本力學性質、透水性質以 及保水特性進行試驗，並探討土石材料在不同飽和度下之力學性質，以對 土石材料之特性有更完整之了解。同時，利用程式ABAQUS 進行數值分 析，對降雨入滲邊坡的現象進行模擬，並改變降雨強度、降雨延時、土壤 的滲透係數、邊坡坡度等參數，以了解各因子對土石流源頭之邊坡穩定的 影響；此外，也利用極限平衡分析邊坡破壞的原因。 最後，針對台灣北、中、東部各地區土石流之不同特性加以了解，並 依據土石流潛勢溪流資料中，找出有災害歷史的溪流，再利用地理資訊系 統軟體ArcView 進行資料庫之建立，包括溪流長度、溪床平均坡度、集水 區面積、有效集水區面積、集水區平均坡度、集水區形狀係數、及地質分 區等影響因子。再將各影響因子應用統計方法進行整理討論，並進一步利 用商用套裝軟體SPSS 做多變量分析，對發生及未發生之潛勢溪流進行分 別群集加以區別分析，以瞭解台灣北、中、東部土石流的發生特性，及建議其所應採用之防治方法。ABSTRACT In recent years, debris flows have caused tremendous damages and loss of life as well as properties in Taiwan. In order to prevent reoccurrence of debris flows and to reduce damages by suitable methods, it is very important to understand the causes and the conditions as flows occurred. The engineering properties of debris-flow materials, which show distinctive characteristics in different regions, are important factors that influence the occurrence of debris flows. In this research, two areas selected to study are in Taipei County: the Chongher area, located at Chinshan, and the Houtong area, located at Rueifang. These two sites were attacked by debris flows during typhoon Xangsen in 2000. Moreover, the geological conditions of the two sites are distinct from the regions studied in previous researches which focused mainly on the middle and eastern parts of Taiwan. The work of this study includes laboratory tests, numerical simulation, and statistical analysis. The tests are to examine the engineering properties of the materials, including mechanical and hydraulic properties, for stability analyses under saturated and unsaturated conditions. The numerical simulation of the infiltration process utilizes ABAQUS computer program to investigate the change in slope stability from unsaturated into saturated conditions. The influencing factors examined are rainfall intensity, rainfall duration, permeability of soil, gradient of slope, etc. Additionally, numerical results are compared and comparable with those from limit equilibrium analysis performed by STABL program. Finally, the characteristics of debris flows in three regions of Taiwan, the north, the central, and the east, are examined based on the information of debris-flow cases in these regions. A software of geographic information system (GIS) ArcView8.X, is used to establish the database of influencing factors such as topographic factors, etc. Then, using a statistical software SPSS and making multivariable analysis on the happened and not happened cases, the difference in conditions for debris flows to occur is distinguished. Accordingly, suggestions based on the results of this study for various regions of Taiwan are also proposed.application/pdf5492887 bytesapplication/pdfzh-TW國立臺灣大學土木工程學系暨研究所reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/2880/1/922625Z002009.pdf