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Bulletin of Engineering Geology and the Environment

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23.02.2018 | Original Paper

Determination of rock type and moisture content in flysch using TLS intensity in the Elerji quarry (south-west Slovenia)

verfasst von: Tina Živec, Andreja Anžur, Timotej Verbovšek

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 3/2019

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Abstract

Terrestrial laser scanning (TLS) was performed in tectonically undisturbed flysch in the Elerji quarry (south-west Slovenia), which represents heterogeneous rock mass with alternation of marlstone and sandstone beds. A 9.3-m-thick lithological profile was measured in detail and then compared to TLS values of reflected intensity and mineralogical composition of general marlstones and sandstones. The results showed distinguishable differences between the intensity values of marlstones and sandstones, as these two groups were found to be statistically different. It was also possible to discriminate these units with regard to their moisture content, as different values were observed for combinations of lithology and moisture content. Correlations of intensity and RGB (red, green, blue) values for the mineralogical composition of marlstones and sandstones revealed a good correlation of intensity with combined calcite and quartz content; however, such correlation is valid only for sandstones due to their bigger grain size. Larger quartz grains can scatter the laser beam and lower the correlation. The results showed that acquiring data from heterogeneous rock mass using TLS could be used for the geotechnical engineering classification of distant, inaccessible outcrops and excavated faces, based on the well-established RMR (Rock Mass Rating) and GSI (Geological Strength Index) rock mass classification systems. Both RMR and GSI classification systems classify rock mass based on rock composition, structure and surface conditions of discontinuities. Lithological segmentation of heterogeneous rocks presents, therefore, an important input parameter for their further classification.

Vorheriger Artikel The analysis of dates obtained from long-term creep tests to determine creep coefficients of rock salt

Nächster Artikel Geostatistical analyses of exfoliation and tectonic joint set spacing in alpine granites (Aar Valley, Switzerland)

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Titel: Determination of rock type and moisture content in flysch using TLS intensity in the Elerji quarry (south-west Slovenia)
verfasst von: Tina Živec
Andreja Anžur
Timotej Verbovšek
Publikationsdatum: 23.02.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 3/2019
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-018-1245-2

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