Instability phenomena in weathered flysch in Greece

Christoulas, S; Kalteziotis, N.; Gassios, E.; Sabatakakis, N.; Tsiambaos, G.

doi:10.1016/0148-9062(89)90314-8

Cited by 10 publications

(9 citation statements)

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“…The most critical landslide-prone formations regarding lithology, and structure are flysch and neogene sediments, while schist and cherts significantly contribute in landslide phenomena [46]. Slides which usually take place in the gentle slope of flysch mantle are typically quite shallow and take form of a sheet of weathered zone sliding on a slip surface parallel to the ground [47]. In line with [48] and [49], in this paper the term landslide is used for translational and rotational earth slides, which were recorded in landslide inventories.…”

Section: Datamentioning

confidence: 99%

GIS-Based Landslide Susceptibility Mapping on the Peloponnese Peninsula, Greece

2014

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In this paper, bivariate statistical analysis modeling was applied and validated to derive a landslide susceptibility map of Peloponnese (Greece) at a regional scale. For this purpose, landslide-conditioning factors such as elevation, slope, aspect, lithology, land cover, mean annual precipitation (MAP) and peak ground acceleration (PGA), and a landslide inventory were analyzed within a GIS environment. A landslide dataset was realized using two main landslide inventories. The landslide statistical index method (LSI) produced a susceptibility map of the study area and the probability level of landslide occurrence was classified in five categories according to the best classification method from three different methods tested. Model performance was checked by an independent validation set of landslide events. The accuracy of the final result was evaluated by receiver operating characteristics (ROC) analysis. The prediction ability was found to be 75.2% indicating an acceptable susceptibility map obtained from the GIS-based bivariate statistical model.

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Section: Datamentioning

confidence: 99%

GIS-Based Landslide Susceptibility Mapping on the Peloponnese Peninsula, Greece

2014

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“…Serious instability phenomena are observed in the weathered flysch upper zone which, depending on the zone thickness, can be classified either as superficial translational or rotational slides and flows. Slides which usually take place in the gentle slopes of the flysch mantle are typically quite shallow and take the form of a sheet of weathered zone sliding on a slip surface parallel to the ground (Christoulas et al 1988). 2.…”

Section: Geological Setting and Critical Engineering Geological Condimentioning

confidence: 99%

Composite landslides induced by heavy rainfalls in suburban areas: City of Patras and surrounding area, western Greece

2005

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Representative landslide phenomena in western Greece induced by heavy rainfalls, in terms of the geological composition and structure of the affected materials, are thoroughly studied and analyzed. The studied cases involved composite landslides on weathered mantle of flysch and Neogene marls that constitute the most critical landslide prone geological formations in Greece. Their shear strength characteristics were determined from back analyses while low-cost remedial measures, focused on surface and groundwater control, were designed. The effective contribution of the finally constructed works on ground stabilization was systematically monitored by surface and subsurface measurements of ground displacements during a time period after their construction.

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“…Heterogeneity of lithology, intense folding, shearing with numerous overthrusts and weathering, are the main reasons of critical slope stability and the activation of large scale landslides in this formation. The study of large landslides in tectonically disturbed and weathered flysch, affecting the road Trikala to Arta, close to the Elati village, showed that the sliding mass had a thickness of about 10m (Christoulas et al, 1988). The characteris tic engineering dimension (Lc) for the landslide can be as sumed equal to the average thickness of the slide (10m).…”

Section: Shear Strength Of Tectonically Disturbed and Weathered Flyschmentioning

confidence: 99%

“…The shear strength characteristics of weathered flysch was determined by testing specimens in the large shear box apparatus, 300mm square and about 160mm thick (Christoulas et al, 1988, Kalteziotis andTsiambaos, 1994). The weathered flysch specimens were prepared with different block proportions ("gravels" percentage with dimensions greater than about 8mm, i.e.…”

Section: Shear Strength Of Tectonically Disturbed and Weathered Flyschmentioning

confidence: 99%

Engineering Geological Behaviour of Heterogeneous and Chaotic Rock Masses

Tsiambaos

2017

geosociety

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The engineering characterization of heterogeneous and complex geological formations for estimating their rock mass strength and deformability characteristics constitutes a challenge to geo-scientists and engineers dealing with the design and construction of slopes and tunnels. Mélanges and similar heterogeneous mixtures of hard blocks in weaker matrix, known as "bimrocks", present an overall strength significantly greater than the matrix strength, because the presence of rock blocks, above a threshold volumetric proportion, influences the mechanical characteristics and the behaviour of these rock masses. Moreover, recent studies have shown that the strength and mechanical behaviour of heterogeneous and composite rock masses such as flysch and molasses consisting of alternating layers of competent and incompetent rocks are governed by the presence and volumetric percentage of the interlayers of the weaker rocks.

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Instability phenomena in weathered flysch in Greece

Cited by 10 publications

References 0 publications

GIS-Based Landslide Susceptibility Mapping on the Peloponnese Peninsula, Greece

GIS-Based Landslide Susceptibility Mapping on the Peloponnese Peninsula, Greece

Composite landslides induced by heavy rainfalls in suburban areas: City of Patras and surrounding area, western Greece

Engineering Geological Behaviour of Heterogeneous and Chaotic Rock Masses

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