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The role of suction and its changes on stability of steep slopes in unsaturated granular soils

机译：吸力及其变化对非饱和粒状土陡坡稳定性的影响

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A significant part of Italian mountain areas are covered by pyroclastic deposits resting at slopeangles higher than 40-50. The stability of these steep slopes in loose or poorly cemented pyroclastic materialsis essentially guaranteed by the positive effects of matrix suction on shear strength until an increase in saturation(and hence a decrease in suction) is induced by seepage initiated by different processes. The Cervinara flowslide(Campania,Italy) is a typical case where rainfall infiltration increased saturation and hence led to failure ofshallow pyroclastic deposits. At La Fossa Crater (Vulcano Island,north of Sicily,Italy) seepage induced bycondensation of vapor produced by the degassing activity of the active volcano seems instead to be correlatedto slope movements. In the paper the two case studies are examined by means of monitoring data,laboratoryinvestigations and numerical analyses.
机译：意大利山区的大部分地区都被火山碎屑沉积物所覆盖，其倾斜角大于40-50。在松散或胶结性差的火山碎屑材料中，这些陡坡的稳定性基本上由基质吸力对剪切强度的积极影响来保证，直到由不同过程引发的渗漏引起饱和度增加（因此吸力降低）为止。 Cervinara流动滑坡（意大利坎帕尼亚）是降雨渗入增加饱和度并因此导致浅火山碎屑沉积破坏的典型案例。在La Fossa火山口（意大利西西里岛北部的武尔卡诺岛），由于活火山的脱气活动所产生的蒸汽凝结而引起的渗漏似乎与斜坡运动有关。本文通过监测数据，实验室研究和数值分析对这两个案例进行了研究。

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