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ASSESSING HAZARDOUS GEOLOGICAL FEATURES FOR TUNNEL CONSTRUCTION BY MEANS OF GEOTECHNICAL AND GEOPHYSICAL METHODS
Abstract
Major infrastructure projects are nowadays benefiting on the remarkable IT structures which allows to use large datasets of the geotechnical parameters of interest and therefore to test different technical solutions, adapted to the site geology and local tectonic setting. Therefore is of major interest to have an improved knowledge upon the hazardous geological features, to evaluate them and to select among the possible technical solutions the most advantageous (in term of stability, strength and costs). In this study we address the assessment of an area were two parallel double track tunnels were planned to be constructed. Standard investigation techniques based on drilled boreholes (up to 80m depth), and in situ & laboratory determination of geotechnical parameters of interest (permeability, bulk weight, cohesion, friction angle, Youg?s modulus, Poisson coefficient, waves velocities, unconfined compression strength) were applied to obtain the necessary datasets to characterize the terrain and to get estimate data about water infiltration at the tunnel level. The new tunnels routes were also prospected by means of seismic refraction, with the aim to obtain high resolution data of the geological formations and hence to avoid some of the most common troublesome elements for such constructions. Integrated interpretation of geotechnical and geophysical datasets allowed to have an improved knowledge upon the hydrogeological setting in this medium/low ? very low permeability sediments, to locate areas affected by historical landslides but also zones with active terrain movement. The main threats to the future construction, as arising from this study, are strong seismic events, landslides and groundwater outbreaks.
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