碩士 / 國立東華大學 / 自然資源管理研究所 / 92 / The costal zone is continuously affected by the forces from continent, climate, and ocean. When human activities spread to the coastal natural forces scope, those activities will increase possibilities to make the natural forces and the material circulation turn into natural disasters that, threaten human life, properties, and living. In terms of the costal zone of eastern Taiwan, natural hazards include the following types：landslide, river erosion, flood, debris flow, coastal erosion. The 11th Provincial Highway, which partially adjoins the coastal line and crosses through valleys, is the single way to connect the villages on marine terraces. The landslides occur occasionally and are induced by typhoons, heavy rain, or earthquakes. In the recent years, the highway has been broadened, but slope failure hazards along this road have not yet ceased, even the engineering constructed everywhere.
The research topic in this study is slope failure hazard that occurred along the 11th Provincial Highway of eastern Taiwan. The selected factors are stratum, geologic structure (fault, fold), slope, aspect, slope combination, engineering type, and slope toe cutting. Associated with historical records (1995~2002) of slope failure hazard, the author defined the roadside slopes as the land unit for scope study case. Using Dangerous Value Method is to quantify and classify factors. Discriminant Analysis determines each case that is stable or not, and this analysis also assess the relative importance of the variables. Afterwards, compare the results with slope failure hazards occurring actually, and then discuss the difference between them. Total cases in this study are 573. Among the total cases, unstable cases are 218, and stable cases are 355. The results: (1) The percentages of correct classification of weighted or unweighted slope failure quantities are 76.8% and 80.5%, respectively. It is better on unweighted analysis. (2) The relative importance of factors in sequence is slope, stratum, slope combination, aspect, geologic structure, engineering type, and slope toe cutting. The relative importance of slope is obviously higher than the others. (3) The same cases misclassifying simultaneously by two models are 103(18%). There are 73 cases, so-called potential steep slope failure, that could explain reasonably; however, there are 17 cases that cannot explain reasonably and 9 cases that did not take factors into account and 3 cases that affected by debris flow. As the results stated above, the linear-model can explain 80% slope failure phenomena. According to its rationality, the linear-model can explain over 90%.
【Key Word】：Slope Failure, Land Unit, Discriminant Analysis, Dangerous Value Method
| Identifer | oai:union.ndltd.org:TW/092NDHU5148006 |
| Date | January 2004 |
| Creators | Chung-Hua Chen, 陳崇華 |
| Contributors | Zue-Er Chen, 陳紫娥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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