山崩
岩土工程
剪切(地质)
地质学
土壤水分
蠕动
剪切速率
剪应力
材料科学
流变学
土壤科学
岩石学
复合材料
作者
J. Duque,Marco Loche,Gianvito Scaringi
出处
期刊:Geotechnique Letters
[Thomas Telford Ltd.]
日期:2023-06-01
卷期号:13 (2): 105-112
被引量:2
标识
DOI:10.1680/jgele.23.00004
摘要
Shear-rate weakening or strengthening behaviours can effectively control landslide runouts, defining sudden runaway sliding or years-long slow-creep phases. These behaviours are partly controlled by the properties of the basal material. Understanding its stress–strain–time response is crucial in physically-based assessments of landslide dynamics and the associated risk. We investigate the frictional resistance of a calcium bentonite, a kaolin and a quartz sand by means of a conventional ring-shear apparatus under normal stresses representative of landslide shear zones. Results for the fine-grained soils, in line with literature on pure clays, indicate important velocity strengthening, whereas small shear-rate effects were observed in sand. As long as effective stresses remain constant, a velocity strengthening response can exert a feedback that, under certain conditions, counteracts perturbations in boundary conditions and prevents fast runouts on pre-existing shear zones. Accordingly, we argue that specifically testing for shear-rate-dependency and incorporating observed behaviours in model formulations can be beneficial for better predicting landslide fates.
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