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Topic 1 - Triggering, failure mechanics and kinematic evolution

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Topic 1 - Triggering, failure mechanics and kinematic evolution
The input of material in a water body at high velocity, like a landslide or a debris flow, can induce a big, abnormal wave, known as impulse wave or landslide tsunami wave. Once the wave is triggered, the effects on the shorelines are devastating and moreover unlikely predicted. Disastrous past events have been extensively analysed but remain too scarce to properly describe the process. Experiments of impulse waves have been carried out by various authors. The present work was planned to fill the lack of ex
Topic 1 - Triggering, failure mechanics and kinematic evolution
In January 1972, a rock slide of more than 2 million m3 moved along the north-eastern slope of Mt. Granieri (900 m above sea level), in the Allaro River basin, close to Salincriti village (Calabria region, southern Italy). Subsequent field investigations (geomechanical surveys and laboratory creep tests on rock samples ) validated the initially assumed ongoing “retrogressive” evolution of the phenomenon, which is mobilising a rock mass volume of about one million m3. Data from a remote monitoring system
Topic 1 - Triggering, failure mechanics and kinematic evolution
Topic 1 - Triggering, failure mechanics and kinematic evolution
This work concerns with a DSGSD located in upper Sturla Valley (Northern Apennines, Italy), in the Municipality of Borzonasca, in an recently uplifted mountain area where the historic Belpiano hamlet was settled. The investigation of DSGSD was carried out through field survey, historic maps comparison, drilling and monitoring activities; seismic surveys were carried out in order to define the depth of the bedrock not involved in the DSGSD. The DSGSD origin is related to the slope particular geological str
Topic 1 - Triggering, failure mechanics and kinematic evolution
The power balance of a high speed granular mass sliding along planar surfaces is written by taking into account its volume, the slopes of the surfaces (runout and runup), an assigned basal fluid pressure and different possibilities for the energy dissipation. In particular, collisions acting within a thin layer (“shear zone”) at the base of the mass and shear resistance due to friction along the basal surface induce the dissipation of energy. The solution of the ODE describing the mass displacements vs
Topic 1 - Triggering, failure mechanics and kinematic evolution
Rockfalls frequently occur in Alpine areas, creating serious risks to population and buildings; the protection measures against rockfalls cannot be adequately designed unless the comprehensive understanding of rockfall phenomenon. Some experimental rockfall tests have been performed on a talus slope in Grosina Valley (northern Italy), with the aim to check the reliability of common simulation methods and to analyse the motion of falling blocks. First, a-priori kinematic simulations have been performed, and,
Topic 1 - Triggering, failure mechanics and kinematic evolution
An accelerometric array installed on 4 September 2008, has been used to manage the geological risk in the Peschiera Springs drainage plant of Rome’s aqueduct, located in the Central Apennines approximately 80 km from Rome, Italy. The plant occupies a carbonatic slope that is extensively involved in gravitational deformations, which are responsible for underground failures such as cracks and collapses of karst caves. To distinguish among different types of recorded events, an automated procedure was implem
Topic 1 - Triggering, failure mechanics and kinematic evolution
In this paper, we systematically study steady-state pore pressure conditions in translational brittle rockslides, with special focus on saturated and unsaturated flow in variably fractured rock masses. The study includes a discussion of critical hydraulic borehole observations in translational rockslides from British Columbia, Norway and the Italian Alps and explains these observations with a generic numerical rockslide model. Most key observations, such as piezometric pore pressure levels at the base of tr
Topic 1 - Triggering, failure mechanics and kinematic evolution
Vajont was a case of an extremely fast landslide and efforts to clarify the failure have been mainly concentrated in providing a consistent explanation taking into account this characteristic feature. Particularly in the case of Vajont landslide, attention has been essentially focused on the shearing properties of the sliding surface. An accepted explanation for the velocity reached is the thermo-hydraulic-mechanical coupling under saturated conditions, which induces thermal dilation and effective stress r
Topic 1 - Triggering, failure mechanics and kinematic evolution
The study of ancient major rock slope instabilities may help in the detection of the conditions leading to their development, so that consequences and possible prevention and mitigation actions can be envisaged. In this paper, numerical studies have been carried out to recognize the behavior of a rock slope and the kinematics of a rock slide/avalanche in the north-eastern Italian Alps. The “La Marogna” rock avalanche, in the Vicenza Province (Venetian Pre-Alps, North-Eastern Italy), with a volume of ab
Topic 1 - Triggering, failure mechanics and kinematic evolution
Soils and weathered bedrock have been known to slide simultaneously, with the resulting landslides sometimes moving rapidly and triggering debris flows. In this study, we refer to these landslides as deep-seated rapid (catastrophic) landslides (hereafter, DCLs). DCLs can result in serious damage, although the frequency of such disasters is generally low. Therefore, early warning systems and the construction of countermeasures for DCLs are important tools for disaster risk reduction. We analyzed the characte
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