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Modeling of rainfall-induced landslides using a full-scale flume test
Landslides ( IF 6.7 ) Pub Date : 2020-10-22 , DOI: 10.1007/s10346-020-01563-8
Kwangwoo Lee , Jaewook Suk , Hyunki Kim , Sangseom Jeong

A flume test was conducted to evaluate the failure mechanism of a rainfall-induced landslide and to develop a physically based warning system. The test was performed at full scale to prevent scale effects, and the flume was a rectangular channel that was 20 m long, 4 m wide, and 2.5 m deep. The volumetric water content and the matric suction were measured at various depths to determine the rainfall infiltration into partially saturated soil. The displacement and tilt were measured at the slope surface, and a video camera was installed to record the slope failure. The results showed that the rainfall infiltration caused the volumetric water content to gradually increase and the matric suction to decrease. The resulting decrease in the soil strength caused soil deformation. Thus, the rainfall induced a landslide. The matric suction and the degree of saturation were used to calculate the generalized effective stress of the solid skeleton to develop a warning system. The stress paths were calculated using the effective mean stress and the deviatoric shear stress. The inflection point of the stress paths can be used to define a threshold for a rainfall-induced landslide warning system.

中文翻译:

使用全尺寸水槽试验模拟降雨诱发的滑坡

进行了水槽试验以评估降雨引起的滑坡的破坏机制并开发基于物理的预警系统。为防止水垢效应,试验全尺寸进行,水槽为长20 m、宽4 m、深2.5 m的矩形槽道。在不同深度测量体积含水量和基质吸力,以确定降雨入渗到部分饱和土壤中。在坡面处测量位移和倾斜度,并安装摄像机记录边坡破坏。结果表明,降雨入渗导致体积含水量逐渐增加,基质吸力减小。土体强度的降低导致土体变形。因此,降雨引发了山体滑坡。利用基体吸力和饱和度计算固体骨架广义有效应力,开发预警系统。使用有效平均应力和偏剪应力计算应力路径。应力路径的拐点可用于定义降雨引发的滑坡预警系统的阈值。
更新日期:2020-10-22
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