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Limit equilibrium method-based 3D slope stability analysis for wide area considering influence of rainfall
Engineering Geology ( IF 7.4 ) Pub Date : 2022-08-10 , DOI: 10.1016/j.enggeo.2022.106808
Kenta Tozato , Nilo Lemuel J. Dolojan , Yoshiya Touge , Shuichi Kure , Shuji Moriguchi , Seiki Kawagoe , So Kazama , Kenjiro Terada

We propose a method for evaluating the risks of slope failure induced by heavy rain over a wide area by combining infiltration analysis, surface flow analysis, and slope stability analysis based on three-dimensional limit equilibrium method. The influence of the resolution of terrain data is also examined. To determine rainfall-induced water transportation, we employ an infiltration analysis, using the Green-Ampt model, and a surface flow analysis, using the diffusion wave model. For the slope stability analysis, a three-dimensional arc-slip calculation applying the Hovland method is used. The infiltration depth is obtained from the results of the infiltration analysis, whereas the simulated data are used as input data for the slope stability analysis. A region in Kamaishi City, Iwate Prefecture, Japan, where slope failures were observed during typhoon Hagibis on October 12 and 13, 2019, is selected in this study as the target area and a series of analyses are performed. The topographical survey data by an Unmanned Aerial Vehicle (UAV) observed before and after the typhoon are used to identify the actual collapse locations and compare them with the results of the slope stability analysis. In addition, high-resolution topographic data of the target area using UAV data is created and differences in the factor of safety distribution with and without the UAV data for terrain data are compared and discussed. The obtained results revealed that the proposed method can roughly represent the actual slope failure, which is useful for evaluating rainfall-induced slope failure hazards. The results derived from utilizing detailed terrain data by UAV show the importance of using a high-resolution terrain model for evaluating the stability of microtopography, such as forest roads.



中文翻译:

基于极限平衡法的考虑降雨影响的广域3D边坡稳定性分析

基于三维极限平衡法,结合入渗分析、地表流分析和边坡稳定性分析,提出了一种大面积暴雨引发边坡破坏风险评估方法。还检查了地形数据分辨率的影响。为了确定降雨引起的水输送,我们使用 Green-Ampt 模型进行渗透分析,并使用扩散波模型进行表面流分析。对于边坡稳定性分析,使用了应用 Hovland 方法的三维弧滑计算。入渗深度由入渗分析结果得出,而模拟数据用作边坡稳定性分析的输入数据。日本岩手县釜石市的一个地区,本研究选取 2019 年 10 月 12 日至 13 日台风“海贝思”期间发生斜坡破坏的区域作为目标区域,并进行了一系列分析。利用无人机在台风前后观测到的地形测量数据,识别实际塌方位置,并将其与边坡稳定性分析结果进行比较。此外,利用无人机数据创建了目标区域的高分辨率地形数据,并对地形数据有无无人机数据的安全分布系数的差异进行了比较和讨论。所得结果表明,所提出的方法可以粗略地代表实际的边坡破坏,这对于评估降雨引起的边坡破坏危害是有用的。

更新日期:2022-08-10
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