Slope instability mechanisms in dipping conglomerates over weathered marls: Bol landslide, Croatia

Miščević, Predrag; Števanić, Danijela; Štambuk-Cvitanović, Nataša

doi:10.1007/s00254-008-1236-x

Cited by 20 publications

(8 citation statements)

References 18 publications

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“…Preglednica 3: Spro{~anje fli{nih kamnin in umikanje pobo~ja (povpre~no na teden in skupaj; *specifi~na masa fli{a 2300 kg/m 3 (Mi{~evi}, [tevani} in [tambuk-Cvitanovi} 2009) Glej angle{ki del prispevka. Glej angle{ki del prispevka.…”

Section: Metodologija Meritevunclassified

“…We used Figure 8 with a black circle. Table 3: Sediment production from steep bare flysch slopes and rockwall retreat (average per week and total; *bulk density of flysch 2,300 kg/m 3 (Mi{~evi}, [tevani}, and [tambuk-Cvitanovi} 2009), **bulk density of flysch 1,712.04 kg/m 3 (our measurements; similar also Petkov{ek, Klop~i~, and Majes 2008) the latter to calculate the determination multiple linear correlation coefficient (R 2 ) as well. For our variables the proportion of explained variance for the average of erosion plots lies between 0.7697 (n = 63; p < 0.0000; R = 0.8773) or 76.97% and 0.7982 (n = 42; p < 0.0586; R = 0.8934) or 79.82%.…”

Section: Correlation With Weather Conditionsmentioning

confidence: 99%

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Erosion processes in Slovene Istria – part 2: Badlands

Zorn¹

2009

AGS

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Talus slopes form below bare flysch walls, for example, in the Mrtvec badlands along the Dragonja River (photograph: Matija Zorn). Pod golimi fli{nimi stenami nastajajo meli{~a, kot na primer na erozijskem ari{~u Mrtvec ob Dragonji (fotografija: Matija Zorn). ABSTRACT: This article is a continuation of the article on soil erosion in submediterranean Slovene Istria from the first issue of the 2009 (49-1) journal. In this article we present geomorphic processes in the badlands of the same area (Dragonja River basin, SW Slovenia): sediment production from steep bare (Eocene) flysch slopes (rockwall retreat), movements of flysch debris along erosion gullies, and geomorphic processes on talus slopes. Sediment production of flysch rocks was determined by measurements on erosion plots and totals around 80 kg/m 2 per year on average, which means that steep bare flysch rockwalls retreat at a speed of 35 to 50 mm per year. The badlands not only contain flysch walls but also slopes already eroded by erosion rills and gullies. A dam in one of the erosion gullies with the catchment area of 0.1 ha captured 20 tons of debris in fourteen months. MATIJA ZORNMonitoring on talus slopes of the badlands revealed their dual character because erosion here alternates with accumulation.

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Section: Metodologija Meritevunclassified

Section: Correlation With Weather Conditionsmentioning

confidence: 99%

Erosion processes in Slovene Istria – part 2: Badlands

Zorn¹

2009

AGS

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“…The decrease in durability of the flysch rock mass is responsible for slope stability problems due to the rapid disintegration and loss of shear strength. Eberhardt et al [35] and Miščević et al [36] used numerical analyses to demonstrate that landslides occur through beds of weathered marls due to the degradation of shear strength as a result of weathering and saturation of the rock mass by heavy precipitation. Vivoda Prodan et al [30] determined changes in the residual shear strength due to weathering based on tests using ring shear and direct shear devices.…”

Section: Geotechnical Properties Of Siltstonesmentioning

confidence: 99%

Weathering Influence on Properties of Siltstones from Istria, Croatia

Prodan

Arbanas

2016

Advances in Materials Science and Engineering

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Slaking and weathering of weak rocks result in slope instability. Siltstones from flysch rock masses are highly susceptible to weathering, which causes rapid changes in the geotechnical properties and durability. This study investigated siltstone samples of different weathering grades from flysch rock masses from the Istria Peninsula, Croatia, and determined the effects of weathering on their engineering properties. Laboratory testing of siltstone samples of different weathering grades was conducted to determine the specific gravity, grain size distribution, Atterberg limits, and uniaxial compressive strength. The standardized slake durability index is not sufficient to classify the durability of weak rock masses such as siltstones. Therefore, the durability of siltstone samples of different weathering grades was quantified from the fragment size distribution after each of five slaking cycles. The tested samples were classified based on the disintegration ratio, and the modified disintegration ratio was used to determine potential long-term degradation of the tested samples. The results indicated that weathering has a significant influence on the plasticity, uniaxial compressive strength, and durability characteristics and thus affects the landslides and erosion processes in siltstones in the flysch zone of the Istria Peninsula.

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“…Based on data presented in previous sections, it can be concluded that the stability of slopes cut in marl should not be considered only from the standpoint material strength of material immediately after the excavation, nor only from the aspect of position of bedding joints and other joints with respect to the cut slope position [18,19,20]. The analysis should include the factor of time in which the strength of this material will be reduced with weathering, and the factor of weathering depth should also be taken into account.…”

Section: Stability Of Slopes In Marlmentioning

confidence: 99%

Time-dependant stability of slopes excavated in marl

2012

JCE

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Time-dependant stability of slopes excavated in marl The soft rock weathering is considered on the basis of criteria used in various fields such as geology, engineering geology, mineralogy, soil and rock mechanics, and geomorphology. The problem of stability over time should be considered for slopes excavated in marl, in case they are not protected against weathering processes. In addition to disintegration of material on slope surface, the weathering also results in shear strength reduction in the interior of the slope. Principal processes leading to weathering are explained on the example of marl originating from flysch formations near Split.

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Slope instability mechanisms in dipping conglomerates over weathered marls: Bol landslide, Croatia

Cited by 20 publications

References 18 publications

Erosion processes in Slovene Istria – part 2: Badlands

Erosion processes in Slovene Istria – part 2: Badlands

Weathering Influence on Properties of Siltstones from Istria, Croatia

Time-dependant stability of slopes excavated in marl

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