Abstract
To analyze the response to hydrological conditions of an instable slope in a structurally complex clay formation, the hydraulic conductivity of the subsoil was estimated and pore water pressures were monitored. Two types of field tests were carried out: falling head tests in the Casagrande piezometers and localized seepage measurements in test boreholes. The experimental data show that in a narrow band around the slip surface, the hydraulic conductivity is higher—more than two orders of magnitude—than that of the landslide body and of the stable formation. Furthermore, the data of a long-term monitoring by Casagrande piezometers and vibrating wire cells show that the response of pore water pressures to the site hydrological conditions along the shear band is far faster than in the landslide body and in the stable formation. The slip band seems largely connected to the atmosphere, and the water pressures in the band are correlated with the deep displacement rates of all the inclinometers crossing the active slip surface.
Highlights
Earthflows are widespread in tectonized clayey turbidites of the Italian Apennines; complex and long processes control their evolution
The experimental results reported in this paper show that the relatively high values of hydraulic conductivity along the slip band and the connection of this latter to the atmosphere can be responsible conductivity along the slip to band the Costa connection of thislandslide
The long-term monitoring shows that the average yearly rates of deep displacements in the main channel of the landslide have been almost constant over the 15 years of monitoring
Summary
Earthflows are widespread in tectonized clayey turbidites of the Italian Apennines; complex and long processes control their evolution. The influence of Several authors recognized the role discontinuities preferential flow paths that facilitate discontinuities on landslide behavior was of discussed by as Hencher [9], Sharma. The influence of and Krzerminska et al [11], for a two-fold mechanism: faster pressure build-up and enhanced discontinuities landslide behavior was discussed byconsidered. Ruggeri et al [16] results considered rolepaper of discontinuities the overall behavior experimental reported the in this show that theonrelatively high values of landslides. Latter to the atmosphere can responsible for the kinematic response rainand of the della Gaveta This hypothesis is be supported by both thekinematic results of response a long-term monitoring of pore pressures in the body, in the stable for the to rain of the Costa dellawater. Thislandslide hypothesis is supported by formation and inofthe shear band, and the results permeability in landslide the three different zones of both the results a long-term monitoring of poreofwater pressurestests in the body, in the stable the subsoil.and in the shear band, and the results of permeability tests in the three different zones of formation the subsoil
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