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Quantifying the contribution of matric suction on changes in stability and displacement rate of a translational landslide in glaciolacustrine clay
Landslides ( IF 6.7 ) Pub Date : 2021-01-06 , DOI: 10.1007/s10346-020-01611-3
K. Sattler , D. Elwood , M. T. Hendry , D. Huntley , J. Holmes , P. B. Wilkinson , J. Chambers , S. Donohue , P. I. Meldrum , R. Macciotta , P. T. Bobrowsky

A study of factors impacting landslide displacement rates was conducted on the Ripley Landslide within the Thompson River valley in British Columbia, Canada for the International Programme on Landslides’ project #202. Seasonal and multiyear changes in atmospheric factors cause cyclic fluctuation of matric suction in the vadose zone through changes to the in situ water content. The ingress of moisture is shown to contribute to multiyear and seasonal loss of stability causing increasing landslide displacement rates, often disregarded in slope stability calculations. However, the water content in the unsaturated zone is important, especially in semi-arid to arid climates where the water table is low and large portions of the slope are unsaturated. Additional tools for studying long-term variations in climate and seasonal changes in water content are presented. These tools are used to characterize historical climate and compare several factors that have resulted in changing landslide displacement rates and magnitude. Infiltration of precipitation and snowmelt directly contributes to matric suction loss in the head scarp and is exacerbated by the presence of tension cracks. While groundwater levels are often correlated to changing displacement rates, changes in matric suction can also influence the rates of displacement. Climatic trends over subsequent years alter the long-term soil water accumulation which impacts rates of landslide displacement. By accounting for additional strength, or potentially a loss in strength due to increasing water content, it is possible to develop a more complete understanding of the mechanisms of climate change which drive displacement rates in the translational, metastable earthen slides that dominate the Thompson River valley. These mechanisms can be applied to comparable river valleys around the world.

中文翻译:

量化基质吸力对冰川泥质滑坡稳定性和位移速率变化的贡献

在加拿大不列颠哥伦比亚省汤普森河谷内的 Ripley 滑坡上,为国际滑坡项目 #202 进行了一项关于影响滑坡位移率的因素的研究。大气因素的季节性和多年变化通过原位含水量的变化引起包气带基质吸力的周期性波动。水分的进入会导致多年和季节性的稳定性丧失,从而导致滑坡位移率增加,在斜坡稳定性计算中通常被忽略。然而,非饱和带的含水量很重要,特别是在地下水位低且大部分斜坡是非饱和的半干旱到干旱气候中。介绍了用于研究气候长期变化和含水量季节性变化的其他工具。这些工具用于表征历史气候并比较导致滑坡位移速率和幅度变化的几个因素。降水和融雪的渗透直接导致顶坡的基质吸力损失,并因张力裂缝的存在而加剧。虽然地下水位通常与变化的置换率相关,但基质吸力的变化也会影响置换率。随后几年的气候趋势改变了影响滑坡位移速率的长期土壤水分积累。通过考虑额外的强度,或由于含水量增加而可能造成的强度损失,有可能更全面地了解气候变化的机制,这些机制驱动了在汤普森河谷占主导地位的平移、亚稳态土质滑坡的位移率。这些机制可以应用于世界各地类似的河谷。
更新日期:2021-01-06
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