Canelles landslide: modelling rapid drawdown and fast potential sliding |
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Authors: | Núria M Pinyol Eduardo E Alonso Jordi Corominas José Moya |
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Institution: | (1) International Center for Numerical Methods in Engineering, Department of Geotechnical Engineering and Geosciences, Universitat Polit?cnica de Catalunya, Edificio D-2, Campus Nord, UPC, 08034 Barcelona, Spain;(2) Centre Internacional de M?todes Num?rics en Enginyeria (CIMNE), Universitat Polit?cnica de Catalunya, Jordi Girona 1-3, Edifici C1, 08034 Barcelona, Spain |
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Abstract: | A large landslide (40 × 106 m3) was reactivated on the left bank of Canelles reservoir, Spain. The instability was made evident after a considerable reduction
of the reservoir level. The drawdown took place during the summer of 2006 after several years of high water levels. The drawdown
velocity reached values between 0.5 and 1.2 m/day (registered at low elevations). The paper reports the geological and geotechnical
investigations performed to define the movement. The geometry of the slip surface was established from the detailed analysis
of the continuous cores recovered in deep borings and from limited information provided by inclinometers. Deep piezometric
records provided also valuable information on the pore water pressure in the vicinity of the failure surface. These data allowed
validating a flow–deformation coupled calculation model, which takes into account the changes in water level that occurred
4 years previous to the failure as well as the average rainfall. The analysis indicates that the most likely reason for the
instability is the rapid drawdown that took place during the summer of 2006. The potential sudden acceleration of the slide
is also analysed in the paper introducing coupled thermal hydraulic and mechanical effects that may develop at the basal shearing
surface of the sliding mass. The results indicate that the slide velocity may reach values around 16 m/s when displacement
reaches 250 m. |
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