engleski

Discernment of layers in heterogeneous rock masses using Terrestrial Laser Scanning intensity

When dealing with site investigations in heterogeneous rock masses such as flysch, some of the most important properties, besides determining lithological aspects, are geometry (dip and dip direction of layers and secondary joints) and spatial distribution of various layers, which is especially important for slope stability calculation purposes. Determining geometrical aspects by using terrestrial laser scanning (TLS) is a well-known procedure is recently widely used, however, potential of determining spatial distribution of different strata (because of its complexity) is not yet fully implemented. In this paper TLS was performed on a typical cut slope in Eocene flysch. Beside outcrop’s geometrical characteristics, preliminary analysis of the intensity of returned laser backscatter signal was analysed to determine spatial distribution of points with similar intensity values. When compared with results of lithological logging performed during the fieldwork and results of some basic sedimentological analyses, such as carbonate content, spatial distribution of intensity correlated perfectly with detected layers of different material properties. Therefore, the potential of TLS for remote determination of distribution of various lithology over inaccessible areas such as coastal cliffs, or open construction pits, was confirmed. When the results of TLS are properly interpreted, spatial distribution can then be used for detail rock mass characterisation, modelling purposes, either for general slope stability purpose or for detail analysis of local structural failure of rock slopes.

Adriatic coast ; flysch ; LIDAR ; TLS ; intensity ; rock ; cut

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