Preliminary Investigations and Numerical Simulations of a Landslide Reactivation

Arbanas, Željko; Arbanas, Snježana Mihalić; Prodan, Martina Vivoda; Peranić, Josip; Sečanj, Marin; Gazibara, Sanja Bernat; Krkač, Martin

doi:10.1007/978-3-319-53498-5_75

Cited by 13 publications

(7 citation statements)

References 7 publications

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“…The Valići Landslide occurred on 13 February 2014 at the southwestern slope of the Rječina River Valley after a long period of heavy rain [9,15]. Undisturbed soil samples were 2 Geofluids collected from the sample pit in the central part of the Valići Landslide (position 2 in Figure 1), and a series of tests were conducted to determine the basic index properties of the soil.…”

Section: Materials and Study Areamentioning

confidence: 99%

Soil-Water Characteristic Curve of Residual Soil from a Flysch Rock Mass

et al. 2018

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Depending on the nature of the material and suction range, laboratory measurements of the soil-water characteristic curve (SWCC) can be time-consuming and expensive, especially for residual soils, in which a wide range of particle sizes and soil structures typically results in SWCCs that cover a wide range of suction. Investigations of the SWCCs of residual soil from flysch rock masses are rare, and so far, no results were presented in the literature which were obtained by performing measurements on undisturbed specimens. In this paper, a detailed examination of water retention characteristics is performed for a specific type of residual soil (CL) formed by the weathering of a flysch rock mass. Measurements performed by using different techniques and devices on intact specimens were successfully combined to obtain the SWCC during both drying and wetting processes, under different stress conditions, and from saturated to air-dried conditions. Used procedures are suitable for the determination of SWCCs of soils that undergo volume changes during the drying or the wetting process, since instantaneous volumetric water content can be determined. Results presented in this paper can be used to assess the influence of desaturation of the residual soil covering flysch slopes during dry summer periods by providing key-in material properties required to analyze the transient rainfall infiltration process.

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Section: Materials and Study Areamentioning

confidence: 99%

Soil-Water Characteristic Curve of Residual Soil from a Flysch Rock Mass

et al. 2018

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“…The Krbavčići landslide activated in North Istria in 1979 is currently dormant and has not been moving for the last 40 years. A large number of landslides on the flysch slopes have been reactivated by extreme weather events, such as the Grohovo landslide reactivated in 1996 [32,66], the Valići landslide reactivated in 2014 [33,34] in Rječina Valley, the Krbavčići debris flow in North Istria reactivated in 2003 [2] in Croatia, the Ca' Lita landslide reactivated in period from 2002 to 2004 in Italy [67], and numerous landslides reactivated in Slovenia in 2010 [68]. A reactivation of the Krbavčići landslide is possible under the conditions of long-lasting precipitation events and the resulting rise in the groundwater level or in the case of landslides where a further weathering of rock mass has developed along existing sliding surfaces.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have investigated the effects of weathering on the strength of the flysch rock masses [9][10][11][12][13][14], as well as the hydro-mechanical properties of the soil in the unsaturated zone of the flysch slopes [15][16][17][18][19]. Numerous authors have investigated triggers of slope instabilities in soft rocks such as flysch rock mass [20,21] and have performed slope stability analyses of flysch slopes that are susceptible to weathering processes causing a decrease in material strength [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Figurementioning

confidence: 99%

“…After a major slide, a new stable landslide position was taken, and no further displacements were observed (Figure 4c). Numerous authors have investigated triggers of slope instabilities in soft rocks such as flysch rock mass [20,21] and have performed slope stability analyses of flysch slopes that are susceptible to weathering processes causing a decrease in material strength [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Description Of the Krbavčići Landslidementioning

confidence: 99%

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Analysis of the Possible Reactivation of the Krbavčići Landslide in Northern Istria, Croatia

Prodan¹,

Arbanas²

2020

Geosciences

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The Krbavčići landslide occurred in January 1979 near the town of Buzet, Croatia, after a long period of heavy rainfall. It is located in Northern Istria in the area built of flysch rock mass where numerous mass movements in the past and recent history have been recorded. A flysch rock mass is highly susceptible to weathering, which leads to material disintegration, changes in geotechnical properties, and shear strength decrease, finally resulting in instability processes in flysch slopes. This paper describes existing information about the Krbavčići landslide occurrence, laboratory testing of siltstone samples from a flysch rock mass, and numerical slope stability analyses of a possible landslide reactivation caused by possible long rainy periods and further weathering of the flysch rock mass. Slope stability analysis using the Rocscience, Slide software, as well as landslide numerical simulations using the LS-Rapid simulation software were performed on the basis of the digital elevation model (DEM) and laboratory test results of siltstones with different weathering grades. A DEM of the Krbavčići landslide was obtained on the basis of the unmanned aerial vehicle (UAV) survey conducted in March 2016. The residual shear strength of siltstones to predict a reactivation of landslides is of highest importance and was determined by ring shear and direct shear tests on siltstone samples with different weathering grades. The results of the numerical simulations show that an increase of the groundwater level in the landslide body in combination with the further weathering of the flysch rock material at the sliding surface would have the main influence on a possible landslide reactivation and the further development of the landslide displacement.

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“…On the other hand, there are frequent rockfalls on cuts along the roads, causing problems and demanding certain stabilization measures, as well as deep seated landslides in the area of carbonate-flysch geological contact [3]. The focus of the present studies in the wider area of the testing locations (Vinodol and Rječina River Valley) are the instability phenomena [4][5][6][7][8][9] and some flysch rock mass properties closely related to landslide initiation, such as weathering in relation with the strength reduction [10,11] and hydromechanical properties related to precipitation amounts [12,13]. However, UCS values of limestone in the coastal area of Croatia are mostly parts of the geotechnical designs, related to rock mass engineering, unavailable for the public, and in the interest of this research.…”

Section: Introductionmentioning

confidence: 99%

Determination of Uniaxial Compressive Strength of Limestone

Vračević

Jovančević

Peranić

et al. 2019

Zb. rad. (Građev. fak. Rij., Online)

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The most used parameter in rock engineering practice is the Uniaxial Compressive Strength (UCS). It is often estimated on the field or trough Index-to-strength conversion factors proposed by various researchers for a specific rock type. The research presented in the paper involved field estimation of Uniaxial Compressive Strength using Schmidt rebound hammer and Point Load laboratory testing on limestone rock samples. The results of the estimated UCS were compared to the Uniaxial Compression Strength laboratory testing results on limestone specimens taken from the same location, in order to compare corresponding UCS of limestone rocks. These results can contribute to better estimation of the local design parameters, when direct determination of the UCS in the laboratory is not possible, rather than adopting the values from around the world case studies.

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Preliminary Investigations and Numerical Simulations of a Landslide Reactivation

Cited by 13 publications

References 7 publications

Soil-Water Characteristic Curve of Residual Soil from a Flysch Rock Mass

Soil-Water Characteristic Curve of Residual Soil from a Flysch Rock Mass

Analysis of the Possible Reactivation of the Krbavčići Landslide in Northern Istria, Croatia

Determination of Uniaxial Compressive Strength of Limestone

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