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Melelli L.,University of Perugia | Cencetti C.,University of Perugia | Cecconi M.,University of Perugia | Faralli L.,SGA Studio Geologi Associati | And 2 more authors.
Environmental Earth Sciences | Year: 2016

The Italian cultural heritage is one of the most noticeable in the world; an important part of it is subjected to natural hazard and risk conditions. Religious buildings, due to their location on impervious sites are particularly exposed to landslides. In this paper we study the hermitage of Cerbaiolo (Tuscany, central Italy). The hermitage, founded in the 8th century as a Benedictine monastery is now a Franciscan Women Institute seat. The buildings are on the edges of a limestone plate overlapped to a clayey formation. Falls, toppling and slides are present along the limits of the plate due to the geomechanics properties of the rock and to the contrast between the two lithological complexes. In order to identify the main joint sets affecting the rock mass a structural-geological survey was carried out and four sets are identified. The rock plate was classified according to Bieniawski, Barton and Geological Strength Index approaches. The outcomes confirm the predisposing factors to mass movements, corresponding to the intensity and characteristics of fracturing of the rock mass. With regard to the slope stability analysis, a failure mechanism involving sliding along a single plane (plane failure) was assumed on the first approximation. The analyses take into account the presence of tension cracks as an indicator factor for the instability phenomenon. The results of stability analyses, performed in static and seismic conditions, indicate a widespread instability condition. The dip slope direction, the properties and type of discontinuities and the local variation of composition influence the hazard assessment. © 2016, Springer-Verlag Berlin Heidelberg. Source


Balducci M.,Area Progetto Associati | Faralli L.,SGA Studio Geologi Associati | Venanti L.D.,SGA Studio Geologi Associati | Olivanti C.,Area Progetto Associati
Landslide Science and Practice: Risk Assessment, Management and Mitigation | Year: 2013

The village of Acqualoreto is included in a high risk landslide area. The area coincides with part of a large paleo-landslide. The paleo-landslide does not show any evidence of possible re-activation, however, but many active or dormant landslides, classified as slips or flows, have been identified along parts of the accumulation body. In order to resist the gravitational movement, a series of measures aimed primarily at protecting the city have been constructed. In the preliminary phase the design was to build up a flexible retaining wall together with a system of draining wells aimed to intercept groundwater. In the execution phase, after numerous technical problems, it was necessary to modify the solution proposed, and to intervene proceeding from the top to the foot of the landslide. © Springer-Verlag Berlin Heidelberg 2013. Source


Di Matteo L.,University of Perugia | Faralli L.,SGA Studio Geologi Associati | Gasparri N.,SGA Studio Geologi Associati | Piccioni R.,SGA Studio Geologi Associati | And 2 more authors.
Italian Journal of Engineering Geology and Environment | Year: 2013

This work, based on the results of a series of geotechnical and monitoring studies, analyses two landslides composed of heterogeneous altered marly clayey arenaceous rock and eluvial-colluvial deposits, located near the village of Acqualoreto (Central Italy). The landslides (called here A and B) are characterized by retrogressive movements approaching buildings and roads near the village and by different sliding surfaces between 10 and 25 m b.g.l. Maximum displacement rates were measured after the most significant rainfall events in autumn months. Four years after the installation of drainage systems in both landslides, some considerations on the efficiency of stabilization techniques (horizontal drains and drainage wells) are presented, with analysis of inclinometric and piezometric data, both pre- and post-installation. Results indicate that single alignment of drainage wells in the upper part of landslide A cannot be considered resolutive in reducing the landslide hazard: therefore, new drainage works in the central part of landslide mass and in the accumulation zone should be considered. The horizontal drains in the central/upper part of landslide B did greatly reduce movement, although new drains should be installed along the toe of the landslide for definitive control the groundwater rise. © 2013 Sapienza Università Editrice. Source

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