MAIERATO, ITALY LANDSLIDE (2010)

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Presentation transcript:

MAIERATO, ITALY LANDSLIDE (2010) Case Study MAIERATO, ITALY LANDSLIDE (2010) Group 6: SCOTT SNOW LUCY ASTORGA MATT SAGUIBO

Site Background: Location Southern Italy Calabria Region

Site Background: Soil From the bottom up… Schist and mica-gneiss Coarse sand/sandstone Evaporitic limestone Claysilt with sand

Site Background: Climate Mild winters and temperature changes Rarely severe rainfall Two wet seasons Saturated soils

Problem Description https://www.youtube.com/watch?v=-nx-gYYRu5I

Problem Description Mechanism of Slope Failure: Vertical Infiltration Process Seepage flow along base rock Water Table exceeded limit level

Problem Description

Failure Slope Video https://www.youtube.com/watch?v=vJtYTbQecNE

Aftermath of the Landslide The Maierato landside was considered a complex and composite roto-translational rock slide. The landslide was a geological phenomenon caused by heavy rainfall. This cause the pore water pressure along with gravity to be the main triggering mechanism for this landslide.

Slope Stability Analysis The cohesion (c) and friction angle () Create Linear Relationship between "Normal Force" (i.e. pressure from weight perpendicular to the failure surface) and shear strength (i.e. resistance to sliding-shearing along the failure surface) Trying to achieve a FS =1 Factor of Safety (FS) is defined as the resisting stresses dividing by the driving stresses Slope failure occurs when resisting stresses = the driving stress Linear develop of the cohesion- friction angle representative of the sliding surface in Maierato.

Slope Stability Analysis Computer Program: GSTABL7 Version 2.0 Purpose: Calculate the mobilized shear strength at failure Assumptions: Failure surface = circular Slope profile determined using topographic map Water depth = 20 ft below surface Soil properties estimated within the normal ranges

Slope Stability Analysis Results C = 2785 is a soil that is perfectly cohesive cohesion can’t be less than 0 Phi = 25.5 perfectly frictionless good idea of phi compared to similar cases/materials Changed the water table to see the stability of the slope. The rain contributed to the reduction of the cohesive component of soil shear resistance