Gravitational instability processes in densely fractured rock masses: the finite-difference method applied to the Marinasco-Strà slope near La Spezia (Italy) The Marinasco-Strà village is involved in wide instability phenomena in rock masses, determining a high landslide risk. In this area a geological-technical, kinematic and geomechanical characterization of the landslides and rock masses was carried out. Moreover, a monitoring system concurred in collecting important data on rainfall, piezometric response and deformation of the slopes. This integrated approach allowed the realization of a model of the landslide mass, regarded as a multiphase system and based on the physical-mechanical characterization of soil and rock. The determination of the state of stress and deformation and the location of actual or possible zones of failure inside the slope were among the main aims. In particular, the finite-difference method was applied, in order to estimate the stressstrain response of the slope to the variations of tensional state; in fact, this method fits better the instability phenomena in intensely fractured rock masses. A deformation model, consistent with the results of the investigations, was performed. In the analysed model, the shear strain concentrates along the main discontinuities deriving from plastic deformation of the mass causing the slope failure.
Processi gravitativi di instabilità in rocce molto fratturate: il metodo alle differenze finite in un caso applicativo della provincia di La Spezia.
SCIARRA, Nicola
2006-01-01
Abstract
Gravitational instability processes in densely fractured rock masses: the finite-difference method applied to the Marinasco-Strà slope near La Spezia (Italy) The Marinasco-Strà village is involved in wide instability phenomena in rock masses, determining a high landslide risk. In this area a geological-technical, kinematic and geomechanical characterization of the landslides and rock masses was carried out. Moreover, a monitoring system concurred in collecting important data on rainfall, piezometric response and deformation of the slopes. This integrated approach allowed the realization of a model of the landslide mass, regarded as a multiphase system and based on the physical-mechanical characterization of soil and rock. The determination of the state of stress and deformation and the location of actual or possible zones of failure inside the slope were among the main aims. In particular, the finite-difference method was applied, in order to estimate the stressstrain response of the slope to the variations of tensional state; in fact, this method fits better the instability phenomena in intensely fractured rock masses. A deformation model, consistent with the results of the investigations, was performed. In the analysed model, the shear strain concentrates along the main discontinuities deriving from plastic deformation of the mass causing the slope failure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
