Abstract
This study focused on the landslide case at Su-Hua Highway 115.9k, Taiwan. A preliminary investigation was conducted on geomorphologic features change and landslide mechanisms using digital elevation models, geographical maps, and remote sensing images at different times in conjunction with geological surveys and analysis results. Using the results of geological surveys and physical model experiments, we constructed a discrete element method to simulate the process of landslide movement. The results revealed deformation in the metamorphic rock slopes upstream of 115.9k. The slopes around the erosion gully upstream presented visible slope toes cutting and tension cracks at the crest as well as unstable rock masses. According to the results of numerical simulation for typhoon Megi event, intense rains could induce slippage in the rock debris/masses in the source area, initially at a speed of 5–20 m/s. Subsequently, steeper terrain could cause the rock debris/masses to accelerate to form a high-speed (>30 m/s) debris slide quickly moving downstream to form an alluvial fan downstream by the sea.
References
Chu HK, Lo CM, Chang YL (2012) “Stability issues and preliminary analysis of Su-Hua highway with Su-Hua highway 115.9k as an example”, 2012 Taiwan Rock Engineering Symposium, Chungli, pp 579–588
Chou HT, Lee CF, Lo CM, Lin ZP (2012) “Landslide and alluvial fan caused by an extreme rainfall in Suao, Taiwan.” 11th International Symposium on Landslides (ISL) and the 2nd North American Symposium on Landslides. Banff, Alberta, Canada, pp 1–7
Chu HK, Lo CM, Chang YL (2013) Numerical analysis of slope stability at the 115.9k point of the Su-Hua highway. J Chin Soil Water Conserv 44(2):97–104
Directorate General of Highways (2010) Feasibility study and priority construction planning tasks for the improvement of the mountainous sections on highway 9, the Su-Hua highway, Geotechnical Engineering Survey and Documentary Report
Fu R, Cha NT, Hsueh WC (2004) The measures adopt to solve the NYC Tunnel high pressure water. Chin J Rock Mech Eng 23(2):1–7
Giani GP, Migliazza M, Segalini A (2004) Experimental and theoretical studies to improve rock fall analysis and protection work design. Rock Mech Rock Eng 37:369–389
Hungr O (2007) Dynamics of rapid landslides. Progress in landslide science, chapter 4. Springer, Berlin, pp. 47–56
Itasca Consulting Group Inc. (2002) PFC3D particle flow code in 3 dimensions. User’s guide. Itasca Consulting Group, Minneapolis
Lee YL (2010) Aerial survey of geological disasters along Su-Hua highway. Geology Quarterly 29(4):21–25
Lo CM, Lin YH, Jeng TY, Wei LW, Chi CC, Lin HH (2011) “Kinematic process of the catastrophic landslide through investigation and numerical simulation”, 14th Conference on Current Researches in Geotechnical Engineering in Taiwan, pp 1–12
Lo CM, Lin ML, Tang CL, Hu JC (2011b) A kinematic model of the Hsiaolin landslide calibrated to the morphology of the landslide deposit. Engineering Geology 123:22–39
Potyondy DO, Cundall PA (2004) A bonded-particle model for rock. Int J Rock Mech Min Sci 41:1239–1364
Steven NW, Simon D (2006) Particulate kinematic simulations of debris avalanches: interpretation of deposits and landslide seismic signals of Mount Saint Helens, 1980 May 18. Int J Geophys 167:991–1004
Taipei Association of Applied Geology Engineers (2011) Comprehensive geological safety evaluation report for Tungaoling Area. Ministry of National Defense, R.O.C
Acknowledgments
The research is mainly supported by the National Science Council of Taiwan, grant no. NSC 101-2218-E-270-001. The advice, comments, and help provided by the editor and two anonymous reviewers have significantly strengthened the scientific soundness of this paper. Their kind assists are gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lo, CM., Lee, CF., Chou, HT. et al. Landslide at Su-Hua Highway 115.9k triggered by Typhoon Megi in Taiwan. Landslides 11, 293–304 (2014). https://doi.org/10.1007/s10346-013-0435-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10346-013-0435-z