Physico-mechanical and mineralogical investigations of red bed slopes (Cluj-Napoca, Romania)

Marat, Andreea Rebeca; Tămaș, Tudor; Samşudean, Cristian; Gheorghiu, Robert

doi:10.1007/s10064-021-02542-6

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…This study mainly focuses on the influence of mineral compositions on geomorphic characteristics, particularly the layered structure and color of red beds. The mineral compositions of red beds (1,536 groups data) were collected from the previous studies as shown in Supplementary Table 1 (e.g., (Bai et al 2020;Chen et al 2014;Jian et al 2009;Li et al 2023;Li et al 2015;Li et al 2013;Liu et al 2020;Marat et al 2022;Wang et al 2018;Wang et al 2014;Wang et al 2017;Yao et al 2016;Zha et al 2022;Zhang et al 2016;Zhang et al 2020;Zhang et al 2021)). These studies used semi quantitative or quantitative methods in XRD technology to statistically analyze the differences in mineral composition between different red beds (e.g., quartz, feldspar, mica, hematite, clay minerals, and calcite), as detailed in the aforementioned literatures.…”

Section: Data Collectionmentioning

confidence: 99%

“…According to the characteristics of disasters such as landslides, the red beds belong to "landslide prone strata", and the instability of slopes with weak interlayers of the red beds is particularly evident (Zhang et al 2015). This is mainly due to the strong hydrophilicity and weak permeability of the red beds, which are prone to softening and plastic deformation under the action of water; After absorbing water, the red beds are easy to expand, and after losing water, they are easy to contract; The weathering resistance of the red beds are weak, they are easy to collapse, and their compressive and shear strength are low (Marat et al 2022;Wang et al 2017;Wu et al 2018;Zhang et al 2016). The red beds have different lithology or poor binding force with other rock strata, which can easily cause differential deformation and lead to rock mass sliding along the bedding plane (He et al 2023;Liu et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Basic chemical compositions combination rules and quantitative criterion of red beds

Cui,

Liao,

Kong

et al. 2024

Preprint

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Abstract. Red beds belong to slippery formations, and their rapid identification is of great significance for major scientific and engineering issues such as geological hazard risk assessment and rapid response. Existing research often identifies red beds from a qualitative or semi quantitative perspective, resulting in slow recognition speed and inaccurate recognition results, making it difficult to quickly handle landslide geological disasters. Combined with the correlation between red beds geomorphic characteristics, mineral compositions, and chemical compositions, this study established a rapid quantitative identification criterion based on the basic chemical compositions combination rules in the red beds. By collecting chemical compositions data of rocks containing red beds, a total of 241,405 groups data were collected for qualitative and quantitative comparison between multiple sets of chemical composition combinations. The results indicate that simultaneously meeting the following chemical composition combinations can serve as a quantitative criterion for distinguishing red beds from other rocks: SiO2+Al2O3 ≈ 50.7 %~85.0 %, Al2O3/SiO2 ≈ 0.14~0.41, FeO+Fe2O3 ≈ 0.9 %~7.9 %, Fe2O3/FeO ≈ 1.52~7.70, K2O+Na2O ≈ 1.6 %~6.8 %, Na2O/K2O ≈ 0.02~0.43, CaO+MgO ≈ 0.8 %~9.2 %. By comparing the chemical composition combinations of 15 kinds of rocks collected from China in this study, it is proven that the quantitative criterion proposed in this study are effective.

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Section: Data Collectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Basic chemical compositions combination rules and quantitative criterion of red beds

Cui,

Liao,

Kong

et al. 2024

Preprint

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“…Red beds are clastic sedimentary rocks dominated by red continental deposits, primarily mudstone, sandstone, and siltstone. It is widely distributed worldwide, such as in Southwest China, the Alps, and the Colorado Plateau [1][2][3][4]. The WMI (weak muddy intercalation) is a fragile structural surface between the upper and lower rock layers, which controls the stability of the red-bedded slope.…”

Section: Introductionmentioning

confidence: 99%

Research on the Harmless Treatment of Weak Muddy Intercalation in Red-Bedded Soft Rock via Microwave Energy

Hu,

Gu,

Liu

et al. 2023

Minerals

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The WMI (weak muddy intercalation) is a typical weak structural surface in the red-bedded rock mass; ensuring slope stability by increasing the strength of the WMIs helps reduce project costs and carbon emissions. With the advantages of energy saving, high efficiency, and green, microwave technology has attracted scholars’ attention to geotechnical material property improvement. However, the mineral composition of the WMIs is complex and variable, and the applicability of microwave technology needs further evaluation. In this paper, the effects of microwave temperature and clay mineral types and content on the physical and mechanical properties of the WMIs were evaluated. The results show that microwave heating can substantially improve the uniaxial compressive strength of the WMIs, regardless of the types and content of clay minerals. Dehydration, dehydroxylation of clay minerals, and local melting of albite occurring in the specimens under microwave heating enhanced the strength of the soil particles and the interparticle joints. The strength increase ratios of the WMI specimens increased with the temperature increase. With the increase in clay mineral content, the strength increase ratio of kaolinite WMIs and illite WMIs decreased, while the strength increase ratios of montmorillonite WMIs increased. The present multiple regression analysis methods are used to establish the strength prediction models of the WMI microwave-reinforced specimens, which can guide the engineering application.

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Stability evaluation of slopes with bedding planes parallel to the slope, considering saturation softening effect of undisturbed potential slip zones

Wu,

Xiang,

Zhang

et al. 2024

Bull Eng Geol Environ

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Physico-mechanical and mineralogical investigations of red bed slopes (Cluj-Napoca, Romania)

Cited by 6 publications

References 27 publications

Basic chemical compositions combination rules and quantitative criterion of red beds

Basic chemical compositions combination rules and quantitative criterion of red beds

Research on the Harmless Treatment of Weak Muddy Intercalation in Red-Bedded Soft Rock via Microwave Energy

Stability evaluation of slopes with bedding planes parallel to the slope, considering saturation softening effect of undisturbed potential slip zones

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