Effects of the foot evolution on the behaviour of slow-moving landslides

Ferrari, Alessio; Ledesma, Alberto; González, David; Corominas, Jordi

doi:10.1016/j.enggeo.2010.11.001

Cited by 34 publications

(14 citation statements)

References 9 publications

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“…This is supported by the observation that the period of faster displacement lasted for more than two years when pore pressures would have varied seasonally, as shown by the monitored pore-water pressures. These findings are similar to those of Ferrari et al (2010), who showed that landslide movement could be controlled by erosion and movement of a "foot block" at the toe of the landslide, which regulates the movement of the larger landslide. Frictional basal sliding leading to permanent surface displacement occurred at an extremely slow rate over the remainder of the monitoring period.…”

Section: Basal Sliding and Plastic Deformationsupporting

confidence: 78%

Basal sliding and plastic deformation of a slow, reactivated landslide in New Zealand

Massey

Petley

McSaveney

et al. 2016

Engineering Geology

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The Taihape landslide is a large, deep-seated, translational rockslide in central North Island of New Zealand, one of over 7000 large landslides mapped in the late Neogene deposits of this area. This study examined its patterns of movement using high temporal resolution, high-precision monitoring and explored the relationships between the movement and triggering mechanisms. During the 30-year monitoring period, movement was always extremely slow, but included periods of faster and slower motion due to a combination of simultaneous basal sliding, internal plastic deformation and seasonal soil shrinkage and swelling. The data suggested that movement rate was not controlled by pore-water pressure or any other monitored parameter. Intervals of more rapid movement appear to follow toe erosion that debuttress the landslide mass, an example of which occurred following a flood in February 2004 that had a return period of about 100 years.The high-temporal and spatial frequency of the monitoring and the measurement precision of the instruments have allowed new insights into the complex movement patterns of deepseated, slow moving rockslides. The patterns of movement observed here, and the techniques described to collect and analyse the data, are applicable to many slowly moving landslides in New Zealand, and to those occurring in similar environments worldwide.

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Section: Basal Sliding and Plastic Deformationsupporting

confidence: 78%

Basal sliding and plastic deformation of a slow, reactivated landslide in New Zealand

Massey

Petley

McSaveney

et al. 2016

Engineering Geology

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“…Between March and May 2007, the situation is reversed and movement at CR1 and CR4 (lowest unit) accelerates significantly while those of the intermediate unit decrease. Even though the increase of pore water pressures has been claimed as the main cause for the sudden increase of the landslide displacements (Corominas et al, 2005), a similar response can be obtained by considering the erosion of the landslide foot by the Vallcebre torrent (Ferrari et al, 2011). As high discharge of the Vallcebre torrent is associated only with high-intensity rainfall events such as the observed between March and May 2007 (Fig.…”

Section: Dinsar Resultsmentioning

confidence: 67%

Interferometric SAR monitoring of the Vallcebre landslide (Spain) using corner reflectors

Crosetto¹,

Gili

Monserrat³

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper describes the deformation monitoring of the Vallcebre landslide (Eastern Pyrenees, Spain) using the Differential Interferometric Synthetic Aperture Radar (DInSAR) technique and corner reflectors (CRs). The fundamental aspects of this satellite-based deformation monitoring technique are described to provide the key elements needed to fully understand and correctly interpret its results. Several technical and logistic aspects related to the use of CRs are addressed including an analysis of the suitability of DInSAR data to monitor a specific landslide, a discussion on the choice of the type of CRs, suggestions for the installation of CRs and a description of the design of a CR network. This is followed by the description of the DInSAR data analysis procedure required to derive deformation estimates starting from the main observables of the procedure, i.e., the interferometric phases. The main observation equation is analysed, discussing the role of each phase component. A detailed discussion is devoted to the phase unwrapping problem, which has a direct impact on the deformation monitoring capability. Finally, the performance of CRs for monitoring ground displacements has been tested in the Vallcebre landslide (Eastern Pyrenees, Spain). Two different periods, which provide interesting results to monitor over time the kinematics of different parts of the considered landslide unit, are analysed and described.

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“…This rising of pore water pressures is supposed to be the effect of the undrained compression of the lowconsolidated and low permeable detritum soils, in the area where P3 piezometer is located. This compression can be caused by the contrast of the unstable sector E against sector Z, which is practically stable (Picarelli et al 2005;Ferrari et al 2011;Lollino et al 2014). The effect of the undrained compression process active in sector E on the significant rising of the piezometric heights measured in P3 cell is clearly observed in Fig.…”

Section: Introductionmentioning

confidence: 87%

Assessment of post-failure evolution of a large earthflow through field monitoring and numerical modelling

et al. 2020

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The analysis of the residual hazard existing after the emergency phases generated by the activation or reactivation of landslides is rarely taken into account in a proper manner. However, the assessment of landslide post-failure evolution should represent a key factor to control potential landslide reactivations and prevent new landslide-induced damages. This paper presents the results of a long-term field monitoring activity performed in the years after the emergency phase of the Montaguto (Italy) earthflow reactivation occurred in 2010 as well as the results of 2-D and 3-D numerical analyses aimed at interpreting the postemergency landslide behaviour. The results of the numerical simulations, which agree well with the in situ monitoring data, allow to define a conceptual model of the earthflow behaviour that is related to the pore water pressure variations resulting from the drained or undrained processes occurring in the landslide body. The study proposed confirms a general reduction of the landslide activity, as well as allows to detect the factors that control the residual activity existing in a specific area of the landslide and to infer possible critical scenarios for landslide reactivations.

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Effects of the foot evolution on the behaviour of slow-moving landslides

Cited by 34 publications

References 9 publications

Basal sliding and plastic deformation of a slow, reactivated landslide in New Zealand

Basal sliding and plastic deformation of a slow, reactivated landslide in New Zealand

Interferometric SAR monitoring of the Vallcebre landslide (Spain) using corner reflectors

Assessment of post-failure evolution of a large earthflow through field monitoring and numerical modelling

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