Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

The hills rising in the urban area of Napoli (Italy ) are the products of eruptive activity in the volcanic areas of Campi Flegrei and Somma Vesuvio. The unsaturated pyroclastic cover, weathered and interbedded with paleosols , is frequently affected by instabilityphenomena that have slight thickness and extension. The observed landslides can be classified as complex phenomena: the movements start as a translational or rotational sliding or as a rock-fall and evolve as the debris flows. 90% of the cases occur during or after severe rainfalls. As is well known , the stability of slopes is affected by climatic conditions, such as rainfall and evapotranspiration, which affect the matric suction near the ground surface. A slope analysis requires that an in situ matric suction profile be measured or predicted. A monitoring system was therefore developed to collect data on suction profiles in pyroclastic soils. Four slopes, chosen as representative of morphological, geological and geotechnical triggering conditions in the studied area, were outfitted with rain gauges, vacuum tensiometers, psychrometers, tiltmeters and TDR gauges.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Analysis and Field Monitoring of Slope Stability in Unsaturated Pyroclastic Soil Slopes in Napoli, Italy

New York, New York

The hills rising in the urban area of Napoli (Italy ) are the products of eruptive activity in the volcanic areas of Campi Flegrei and Somma Vesuvio. The unsaturated pyroclastic cover, weathered and interbedded with paleosols , is frequently affected by instabilityphenomena that have slight thickness and extension. The observed landslides can be classified as complex phenomena: the movements start as a translational or rotational sliding or as a rock-fall and evolve as the debris flows. 90% of the cases occur during or after severe rainfalls. As is well known , the stability of slopes is affected by climatic conditions, such as rainfall and evapotranspiration, which affect the matric suction near the ground surface. A slope analysis requires that an in situ matric suction profile be measured or predicted. A monitoring system was therefore developed to collect data on suction profiles in pyroclastic soils. Four slopes, chosen as representative of morphological, geological and geotechnical triggering conditions in the studied area, were outfitted with rain gauges, vacuum tensiometers, psychrometers, tiltmeters and TDR gauges.