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Erschienen in: Bulletin of Engineering Geology and the Environment 6/2019

02.10.2018 | Case history

Landslide analysis of unsaturated soil slopes based on rainfall and matric suction data

verfasst von: Oswaldo Augusto Filho, Mariana Alher Fernandes

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 6/2019

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Abstract

Shallow slope failures that occur as a result of a decrease in matric suction after water infiltration from intense rains (unsaturated soil conditions) are the main causes of slope instability in tropical and subtropical regions. This study analyzes the occurrence of shallow landslides in a highway cutting of residual soil originating from aeolian sandstone. Characterization of failure mechanisms and stability analyses have been carried out in different scenarios and supported by surface and subsurface investigations, instrumentation and monitoring of rainfall, matric suction, and water level, field tests, and laboratory tests. The results indicate that the reduction in matric suction induced by rainwater infiltration is the triggering mechanism of slope failure. Conventional slope stability analyses and analyses incorporating unsaturated seepage models present results compatible with the hydrological and geotechnical data collected in the study. On the basis of these analyses, and considering the frequent rainfall events in the study area, a critical geometric configuration is proposed for the triggering of landslides in highway cutting slopes of residual soils of aeolian sandstone.

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Metadaten
Titel
Landslide analysis of unsaturated soil slopes based on rainfall and matric suction data
verfasst von
Oswaldo Augusto Filho
Mariana Alher Fernandes
Publikationsdatum
02.10.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Bulletin of Engineering Geology and the Environment / Ausgabe 6/2019
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-018-1392-5

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