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Saint-Christophe, Italy

Perello P.,GDP Consultants
Rock Mechanics and Rock Engineering

In tunnelling, a reliable geological model often allows providing an effective design and facing the construction phase without unpleasant surprises. A geological model can be considered reliable when it is a valid support to correctly foresee the rock mass behaviour, therefore preventing unexpected events during the excavation. The higher the model reliability, the lower the probability of unforeseen rock mass behaviour. Unfortunately, owing to different reasons, geological models are affected by uncertainties and a fully reliable knowledge of the rock mass is, in most cases, impossible. Therefore, estimating to which degree a geological model is reliable, becomes a primary requirement in order to save time and money and to adopt the appropriate construction strategy. The definition of the geological model reliability is often achieved by engineering geologists through an unstructured analytical process and variable criteria. This paper focusses on geological models for projects of linear underground structures and represents an effort to analyse and include in a conceptual framework the factors influencing such models. An empirical parametric procedure is then developed with the aim of obtaining an index called "geological model rating (GMR)", which can be used to provide a more standardised definition of a geological model reliability. © Springer-Verlag 2011. Source

Piane L.D.,GDP Consultants | Fontan D.,SEA Consulting S.r.l. | Mancari G.,SEA Consulting S.r.l.
Geografia Fisica e Dinamica Quaternaria

The Rosone landslide (Western Italian Alps) is a major sliding phenomenon affecting a metamorphic basement and periodically damaging the structures (tunnels and penstocks) of a nearby hydro-power plant. This paper presents the results of a recent study including field geology, seismic surveys and deep boreholes, investigating the poorly known deep structure of the sliding mass, as well as the geometry of the sliding surfaces. A synthetic comparison is made with another large landslide at Mt. Castello, showing some analogies with the Rosone landslide. Source

Perello P.,GDP Consultants | Baietto A.,GDP Consultants | Burger U.,Galleria di Base Del Brennero | Skuk S.,Galleria di Base Del Brennero
Rock Mechanics and Rock Engineering

The construction of the Aica-Mules tunnel, completed in 2010, provides a relevant case history for improving the knowledge of hydrogeological issues related to the excavation of deep tunnels in granitic massifs. The Aica-Mules tunnel is a 10 km-long structure, forming part of the high-speed railway connection between Austria and Italy across the Alpine chain, located at an average depth of 500-1,000 m below the surface. Prior to and during the construction, intense hydrogeological monitoring was set up, allowing the collection of abundant data concerning: (1) the evolution of water inflows into the tunnel; (2) the chemistry and temperature of drained groundwater; and (3) the influence of tunnel drainage on springs. Based on detailed analysis of geological/hydrogeological data, this article provides an insight into the permeability distribution in granitic rocks affected by relevant brittle tectonic deformation, and the consequences of water inflow during excavation. The available time series from the principal water discharges in the tunnel have been used in order to test the reliability of some of the most commonly applied analytical methods for the forecast of water inflows into tunnels. © 2013 Springer-Verlag Wien. Source

Delle Piane L.,GDP Consultants | Perello P.,GDP Consultants | Baietto A.,GDP Consultants | Giorza A.,Geologist | And 3 more authors.
Rock Mechanics and Rock Engineering

Two case histories are presented, concerning the still poorly known alpine deep-seated gravitational slope deformations (DSD) located nearby Lanzada (central Italian Alps), and Sarre (north-western Italian Alps). The Lanzada DSD is a constantly monitored, juvenile, and active phenomenon, partly affecting an existing hydropower plant. Its well-developed landforms allow a precise field characterization of the instability-affected area. The Sarre DSD is a mature, strongly remodeled phenomenon, where the only hazard factor is represented by secondary instability processes at the base of the slope. In this case, the remodeling imposed the adoption of complementary analytical techniques to support the field work. The two presented studies had to be adapted to external factors, namely (a) available information, (b) geological and geomorphological setting, and (c) final scope of the work. The Lanzada case essentially relied upon accurate field work; the Sarre case was mostly based on digital image and DTM processing. In both cases a sound field structural analysis formed the necessary background to understand the mechanisms leading to instability. A back-analysis of the differences between the study methods adopted in the two cases is finally presented, leading to suggestions for further investigations and design. © 2016 Springer-Verlag Wien Source

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