標題: Large paleo-rockslide induced by buckling failure at Jiasian in Southern Taiwan
作者: Yang, Che-Ming
Kang, Keng-Hao
Yang, Shun-Hsing
Li, Kuo-Wei
Wang, Hui-Jung
Lee, Yin-Tsan
Lin, Kuei-Kun
Pan, Yii-Wen
Liao, Jyh-Jong
土木工程學系
防災與水環境研究中心
Department of Civil Engineering
Disaster Prevention and Water Environment Research Center
關鍵字: Paleo-rockslide;Buckling;Large-scale landslide;Geological model;Geomorphological evolution
公開日期: 1-Jan-1970
摘要: The major regions of Taiwan consist of high-relief terrain exposed to frequent typhoons and earthquakes. Recently, thousands of potential large-scale landslides have been delineated via remote sensing analysis and field surveys. However, little attention has been paid to the stability of colluvium, which is a potential hazard. This study investigated a paleo-rockslide site in detail and proposes a geological model to explain the failure mechanism. The studied area is in Jiasian, Southern Taiwan, and the site is a dip slope consisting of Miocene sedimentary rocks. Detailed topographic features, including residual slip surfaces, platforms, scarps, and colluviums, are identified using the slope map of a 1- m airborne remotely sensed digital elevation model. Platforms beneath the residual slip surfaces represent the topographic features of the paleo-rockslide, an interpretation validated by field works and core analysis. The platforms consist of a displaced rock mass (DRM) with a gentle bedding dip angle and interbedded structure that has been preserved. A geological model is established according to the data compiled; outcrops of DRM and colluviums on bedrock were delineated in the geological map and profiles. Outcrops of shear off, buckling, and compressive ridges within the alternating sandstone and shale are distributed at the toe of the residual slip surfaces. A geological model with identified topographic features is adopted to establish the geomorphological evolution of the site. A buckling-induced rockslide model in the dip slope of the interbedded layers is proposed, and potential future slope failure scenarios can be evaluated using the geomorphological evolution model.
URI: http://dx.doi.org/10.1007/s10346-020-01360-3
http://hdl.handle.net/11536/153830
ISSN: 1612-510X
DOI: 10.1007/s10346-020-01360-3
期刊: LANDSLIDES
起始頁: 0
結束頁: 0
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