The high complex structural setting of the Giudicarie belt (centraleastern Alps) has influence on the gravitational evolution of the slopes. The case study of Prezzo landslide (Provincia Autonoma di Trento) shows evidences of structural control on an active rock slope instability. Geological and geomechanical surveys were carried, together with advanced DInSAR (Differential Interferometric Synthetic Aperture RADAR) technique, in order to investigate the slope. Field surveys and interferometric analysis suggest that the Prezzo landslide can be defined as a wedge failure, sliding predominantly along a E-NE trending line and involving both superficial deposits and bedrock, with low rate of movements (10÷20 mm/year). The structural setting of the slope, characterized a synclinal fold structure with E-NE trending fold axis, strongly controls the evolution of the slope instability, allowing the sliding along the dip (northern sector) and the strike (southern sector) of the strata. Geomechanical properties, both JCS (Joint Coefficient Strength) and GSI (Geological Strength Index), show a decrease in the proximity of the fold axis, suggesting an increase of the degree of fracturing induced by the structural setting.

Structural control on the Prezzo landslide (central-eastern Alps, Italy)

DE AGOSTINI, ANNA;GANDOLFO, LUCA
2013

Abstract

The high complex structural setting of the Giudicarie belt (centraleastern Alps) has influence on the gravitational evolution of the slopes. The case study of Prezzo landslide (Provincia Autonoma di Trento) shows evidences of structural control on an active rock slope instability. Geological and geomechanical surveys were carried, together with advanced DInSAR (Differential Interferometric Synthetic Aperture RADAR) technique, in order to investigate the slope. Field surveys and interferometric analysis suggest that the Prezzo landslide can be defined as a wedge failure, sliding predominantly along a E-NE trending line and involving both superficial deposits and bedrock, with low rate of movements (10÷20 mm/year). The structural setting of the slope, characterized a synclinal fold structure with E-NE trending fold axis, strongly controls the evolution of the slope instability, allowing the sliding along the dip (northern sector) and the strike (southern sector) of the strata. Geomechanical properties, both JCS (Joint Coefficient Strength) and GSI (Geological Strength Index), show a decrease in the proximity of the fold axis, suggesting an increase of the degree of fracturing induced by the structural setting.
2013
Rendiconti online della Società Geologica Italiana, 2013, Volume 24
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2837019
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