英文篇名
Refinement and Value-Added Application of Geological Models for Potential Landslide Area in Dejective Zone ~ A Case Study on Bonbon Site
作者
黃淳銘、鍾明劍、康耿豪、陳建新、趙韋安、譚志豪、戴東霖、林錫宏
關鍵字
輕度變質岩帶、潛在大規模崩塌區、邊坡地質調查、邊坡穩定數值分析
摘要
本文研究之芃芃場址為一處下邊坡具重力變形之輕度變質岩帶潛在大規模崩塌區,場址內之潛在滑動塊體具高活動性及分塊複雜性,且高角度牛鬥斷層於本區域通過,造就芃芃場址內之地質、構造變化劇烈及地質模型複雜性高。本文透過地表地質調查、地球物理探查、鑽探等方式針對芃芃場址進行地質調查,並結合長期邊坡活動性觀測成果建置地質模型,模型精進共可分為四個階段,其地質模型之崩積層與下部岩層邊界、崩積層內淺層滑動塊體分塊、牛鬥斷層位置與傾角等地質材料分界與構造位置皆隨調查成果增加逐漸進行修正。配合精進後之地質模型,本文進一步透過GeoStudio軟體進行邊坡穩定性分析,並以情境模擬方式探討常時水位情境、米塔颱風情境、地震情境下之潛在滑動塊體位置與安全係數值,使精進後之地質模型加值應用於防災工作推動。
英文摘要
The Bonbon site studied in this paper is a potential large-scale landslide area in a dejective zone with gravity deformation on the lower slope. The Niutou fault passing through this area has led to dramatic changes in the geology and the structure of the Bonbon site and high complexity of the geological model. In this paper, the geological survey of the Bonbon site is carried out by means of surface geological survey, geophysical survey, and drilling, etc.. Moreover, long-term slope activity observations are conducted. Based on the aforementioned data, a geological model is built. The model refinement can be divided into four stages. The boundary of the colluvium layer, the subdivision of the shallow sliding blocks in the colluvium layer and the location and the dip angle of the Niutou fault, etc. in the geological model are revised with the availability of additional survey results. In conjunction with the advanced geological model, the slope stability is evaluated using GeoStudio. In this paper, the locations of the potential landslide block and the factors of safety under normal groundwater level scenario, Mita typhoon scenario, and earthquake scenario, are presented. The advanced geological model can be value-added as it can be subsequently applied to the promotion of disaster prevention work