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題 名 | 莫拉克颱風引致之阿里山公路邊坡崩塌與機制=Typical Landslides and Related Mechanisms in Ali Mountain Highway Induced by Typhoon Morakot |
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作 者 | 董家鈞; 劉家男; 李維峰; | 書刊名 | 地工技術 |
卷 期 | 122 2009.12[民98.12] |
頁 次 | 頁31-40 |
分類號 | 442.3 |
關鍵詞 | 阿里山公路; 莫拉克颱風; 崩塌; 地質構造; Ali mountain highway; Typhoon Morakot; Landslides; Geological structure; |
語 文 | 中文(Chinese) |
中文摘要 | 莫拉克颱風重創南台灣,豪雨造成多條山區道路因坍方而造成多處中斷,阿里山公路就是其中一條受創嚴重的山區道路,多處路段因崩塌嚴重,災後一個月有少數路段仍待搶通。阿里山公路為台18號公路之俗稱,於民國72年初完工通車,迄今近三十年,災害不斷,為瞭解莫拉克颱風對阿里山公路邊坡的影響,本文作者於民國九十八年九月初進行阿里山公路現地勘查,主要目的在於紀錄幾處典型崩塌之破壞型態,並嘗試利用遙測影像配合初步之地表地質調查成果,初步研判其崩塌機制,並對後續調查、監測與復建規劃設計提出建議。根據現地勘查結果,阿里山公路五處崩塌,均與其本身地質構造及水文地質特性極其相關,其中不連續面位態控制岩坡破壞,特別是斷層帶造成材料弱化以及影響邊坡水文地質特性,進而影響邊坡之穩定性,為崩塌的重要內在因素。藉由研究成果,也提醒了大地工程師,考量未來極端降雨事件之邊坡穩定問題時,應以更全面之角度審視邊坡工程規劃、設計與施工,並妥善分析岩體不連續面、斷層帶以及褶皺構造可能對邊坡穩定性之影響,以評估可能引致災害規模以及防範措施之有效性。 |
英文摘要 | Typhoon Morakot had caused serious damages to southern Taiwan. Almost all major mountain highways located in the affected region suffered severe damages from landslides, rockfalls, and debris flows. Among all these highways, Ali Mountain Highway was one of the most rigorous examples. Ali Mountain highway, i.e. T18 route was constructed in the early 80s. For the past 30 years of operation, it suffered from different natural hazards frequently. In an effort to document the damages and to provide mitigation strategies, the authors conducted extensive field surveys and aerial or satellite images analysis to preliminarily access the failure mechanisms of selected typical slope failures along T18 highway. For five selected sites in this study, engineering and hydraulic geological features were found to be most influential factors to the failures. The weak zones and impermeability of the discontinuities of geological structures, including faults, dominated the global stability of the slopes. In summary, geotechnical engineers should consider carefully the geological structure discontinuities and their properties for slope mitigation. Moreover, considerations of the extreme hazards such as Typhoon Morakot should be also included in future design. |
本系統中英文摘要資訊取自各篇刊載內容。