Slope Stability Analysis as Applied to Rainfall- triggered Landslide in Itogon, Benguet Province, Philippines
Slope Stability Analysis as Applied to Rainfall- triggered Landslide in Itogon, Benguet Province, Philippines
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菲律宾本格特省伊托贡降雨引发滑坡的边坡稳定性分析
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
F. J. Tan
中科院分区：
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作者：
Kim Gerard Oliver M. Alcala;Jhoyen Emmanuel Q. Angeles;Paul Kevin I. Lim;J. Buluran;F. J. Tan
降雨引发的山体滑坡在台风频繁发生的地方很常见，例如菲律宾每年至少经历20次台风。重矿物会使土壤饱和，影响斜坡的稳定性，造成山泥倾泻。一场灾难性的山体滑坡发生在Brgy。吕宋岛的Ucab，Itogon，本盖于2018年9月15日在热带气旋Mangkhut或当地称为台风Ompong期间发生，造成94人伤亡。该研究的重点是滑坡触发的边坡稳定性分析，以帮助提高目前对该地区的滑坡触发的认识。研究结果可用于模拟地震触发的滑坡灾害地图。Itogon滑坡的斜坡模型是使用GEO5 2020建模的。采用简化毕肖普法的分析方法和GEO5 2020软件提供的数值解对该滑坡进行了稳定性分析。边坡稳定性分析表明，考虑到其地质和水文特征等因素，边坡是不稳定的，与发生的灾害事件相一致。
Rainfall-triggered landslides are common in places where typhoons are frequently occurring such as the Philippines which experiences at least 20 typhoons per year. Heavy rainfalls saturate soil and affects the stability of the slopes causing landslides. A catastrophic rainfall-triggered landslide happened in Brgy. Ucab, Itogon, Benguet in Luzon Island which occurred during the Tropical Cyclone Mangkhut or locally known as Typhoon Ompong on September 15, 2018 having 94 casualties. The study focused on slope stability analysis of rainfall-triggered landslides to help improve the current understanding of the rainfall-triggered landslide in the area. The findings of the study can be used in modeling rainfall-triggered landslide hazard maps. The slope model of the landslide in Itogon was modelled using GEO5 2020. Both the analytical method of the Simplified Bishop Method and the numerical solution provided in the software GEO5 2020 were used in analyzing the slope stability of the landslide. The slope stability analysis showed that the slope was unstable upon considering factors such as its geological and hydrological characteristics agreeing with the disastrous event that transpired.