Physical modelling of rainfall-induced flow failures in loose granular soils

International Symposium on Geohazards and Geomechanics 2015

地球科学;生态环境科学

Take, W.A.^1 ; Beddoe, R.A.^2

Department of Civil Engineering, Queen's University, Kingston

ON

K7L 3N6, Canada^1

Department of Civil Engineering, York University, Toronto

ON

M3J 1P3, Canada^2

关键词: Geotechnical centrifuges;    Physical modelling;    Rainfall-induced;    Research communities;    Slope inclination;    Static liquefaction;    Travel distance;    Washington , USA;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/26/1/012001/pdf
DOI  :  10.1088/1755-1315/26/1/012001

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The tragic consequences of the March 2014 Oso landslide in Washington, USA were particularly high due to the mobility of the landslide debris. Confusingly, a landslide occurred at that exact same location a number of years earlier, but simply slumped into the river at the toe of the slope. Why did these two events differ so drastically in their mobility? Considerable questions remain regarding the conditions required to generate flow failures in loose soils. Geotechnical centrifuge testing, in combination with high-speed cameras and advanced image analysis has now provided the landslides research community with a powerful new tool to experimentally investigate the complex mechanics leading to high mobility landslides. This paper highlights recent advances in our understanding of the process of static liquefaction in loose granular soil slopes achieved through observations of highly-instrumented physical models. In particular, the paper summarises experimental results aimed to identify the point of initiation of the chain-reaction required to trigger liquefaction flow failures, to assess the effect of slope inclination on the likelihood of a flowslide being triggered, and to quantify the effect of antecedent groundwater levels on the distal reach of landslide debris with the objective of beginning to explain why neighbouring slopes can exhibit such a wide variation in landslide travel distance upon rainfall-triggering.