Weathering Influence on Properties of Siltstones from Istria, Croatia

Prodan, Martina Vivoda; Arbanas, Željko

doi:10.1155/2016/3073202

Cited by 18 publications

(13 citation statements)

References 20 publications

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“…The sampling depths for all the samples varied from 0.5 to 1 m. After pushing the tubes into the soil, they were excavated and sealed to prevent evaporation. The natural water content ranged from 28% at the ground surface to 10% at a depth of 1 m, while the in situ density varied from 1.91 to 2.13 g/ cm 3 . The mean values of the basic properties of the tested material, including the specific gravity of soil solids (ASTM D854-14) [16], saturated unit weight, particle size distribution (ASTM D1140-17 [17] and ASTM D7928-17 [18]), liquid limit (w L ), plastic limit (w P ), plasticity index (PI) (ASTM D4318-17) [19], and classification of material according to the USCS (ASTM D2487-11) [20], are summarized in Table 1.…”

Section: Materials and Study Areamentioning

confidence: 99%

“…Previous studies of landslides in flysch slopes have mainly focused on the increase in pore water pressure caused by long-term, heavy precipitation as a landslide triggering factor [1] and on the effects of the weathering process of flysch rock masses on the soil shear strength [2,3]. The influence of the rainfall pattern and antecedent rainfall, coupled with the unsaturated soil property functions (USPFs) that govern the complex infiltration processes between the soil surface and the phreatic line, was not considered.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…From the slope stability point of view, precipitation has a multiple influence. The first and most important is the initiation of landslides; the second, but no less important, is the derivation of weathering processes that affect the material shear strength properties [34,35]. The process of rainfall infiltration through flysch deposits was recently studied by Peranić [16,17].…”

Section: Landslides In the Study Areamentioning

confidence: 99%

Influence of Carbonate-Flysch Contact and Groundwater Dynamics on the Occurrence of Geohazards in Istria, Croatia

Jovančević

Rubinić

Ružić

et al. 2021

Land

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This research focuses on the analysis of soil-water interaction at the carbonate-flysch contact on the Istrian peninsula in Croatia. As a result of the interaction of surface and groundwater and the position of flysch and carbonate rocks in the geotechnical profile, two problems occur in the study area: numerous instabilities and the occasionally high turbidity of drinking water. As an example, the St. Ivan spring was considered. The paper presents a complex mechanism of groundwater circulation in geological structures at carbonate-flysch contacts, differences in runoff through karst aquifers and flysch rocks during heavy rainfall under current and predicted (climate change) conditions, and the mentioned geohazards as a result of extreme precipitation. The analyses carried out showed the decisive influence of the existing geological structure on the dynamics of infiltration and precipitation runoff, as well as the risks of pronounced spring water turbidity and instability events. The main drivers of these geohazards are continuous long-term precipitation for landslides and intense daily precipitation for turbidity. Possible consequences of climate change are the increase in precipitation intensity, amount and higher variation, which subsequently brings risks such as the increase in maximum runoff, i.e., the expected more frequent occurrence of high turbidity and the more frequent occurrence of higher cumulative precipitation triggering instabilities in the area.

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“…The degradation potential of the intact rock is highly dependent on different material properties which interact on the rock durability, as rock composition, porosity, fracturing, structural/textural characteristics, and swelling potential [2][3][4][5][6][7]. The initial rock properties may change during weathering and/or alteration processes and can result in a weak and moisture-sensitive rock structure [8], especially if constituting minerals are decomposed or altered into clay minerals. However, the alteration process may also act on the rock in a positive way, as when the re-welding of existing rock discontinuities occurs through the deposition of ferrous oxides, calcite, or siliceous filling material [9].…”

Section: Introductionmentioning

confidence: 99%

Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability

et al. 2021

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Weak and weathered rocks are well known for their sensitivity to changes in moisture content. Degrading behavior is common in weak rocks with moisture-sensitive mineral components and present numerous stability problems. The slake durability is a measure of the resistance to weakening and disintegration of rock materials which quantitatively distinguishes durable from non-durable rock materials. Several rock material parameters interact on the process of disintegration when exposed to cyclic moisture changes, whereby the content of clay is believed to play a major role. This manuscript evaluates the overall material composition of flysch and serpentinite rocks cored from the wall of the shotcrete-lined headrace tunnel of a hydropower project, including minerals, structure, porosity, the presence of micro-discontinuities, and swelling potential, and links these properties to the slake durability. Further, the different methods used to assess compositional features affecting the durability of weak rocks are evaluated and discussed. The manuscript argues that the mineralogical composition and microstructures present in the intact rock and the content of moisture-sensitive constituents, as swelling clays, control the long-term durability of weak rock material. It is demonstrated that XRD assessments are not sufficient to detect the content of brucite and swelling components, and that methods as thin section and SEM analyses should be carried out in the assessment of weak and weathered rock mass.

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Weathering Influence on Properties of Siltstones from Istria, Croatia

Cited by 18 publications

References 20 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

Influence of Carbonate-Flysch Contact and Groundwater Dynamics on the Occurrence of Geohazards in Istria, Croatia

Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability

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