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Analysis of time-varying rainfall infiltration induced landslide

机译：时变降雨入渗诱发滑坡分析

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摘要

A case study of rainstorm-induced landslide is modeled following the hourly rainfall time series from the stage of infiltration caused by induced slope movement and soil saturated to excess pore pressures—Transient Rainfall Infiltration and Grid-based Regional Slope-Stability Analysis (TRIGRS). The grid-based landslide stability analysis was conducted to model the increased pore pressures and runoff in the study area under the specified rainfall conditions. The generated time variances of pore pressures help determine landslide characteristics and mechanisms under rainfall conditions. Inputs of soil properties and permeability parameters for landslide stability analysis in the study area were prepared by TRIGRS adopted for transient infiltration analysis. Results of the analyses show that under heavy rainfall conditions, the infiltrated slope is unstable and the time of debris masses movement initiated is correlated to the recorded time. In the initiated landslide, characteristics and effects are considered and reflected in the numerical modeling under combinations of topography, land use, climatic and geological conditions. Results reveal that there is a plane failure surface and a potential circular failure surface at the study site besides the rock topple failures in the crest. A grid-based slope-stability analysis incorporated with the GIS spatial functions is more advantageous than the traditional two-dimensional analysis for specified slope profiles to determine the whole behavior of a slope.
机译：以降雨诱发的滑坡为例，以每小时降雨时间序列为模型，该时间序列是由诱发的坡度运动和土壤饱和导致的入渗阶段到过高的孔隙压力-瞬时降雨入渗和基于网格的区域边坡稳定性分析（TRIGRS）。进行了基于网格的滑坡稳定性分析，以模拟研究区域在指定降雨条件下增加的孔隙压力和径流。产生的孔隙压力时间变化有助于确定降雨条件下的滑坡特征和机理。采用TRIGRS进行瞬态入渗分析，为研究区域的滑坡稳定性分析输入了土壤特性和渗透性参数。分析结果表明，在强降雨条件下，入渗坡度是不稳定的，碎片运动的开始时间与记录的时间有关。在始发的滑坡中，在地形，土地利用，气候和地质条件相结合的数值模拟中考虑并反映了特征和影响。结果表明，除了波峰的岩石倾覆破坏外，研究地点还存在一个平面破坏面和一个潜在的圆形破坏面。结合GIS空间功能的基于网格的边坡稳定性分析比用于确定边坡轮廓的整体二维分析的传统二维分析更具优势。

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