engleski

Identification of potentially unstable rock blocks on the road cut in the Krka National park, Croatia

In this paper, the visual and semi-automatic identification of potential rock fall source areas and unstable rock blocks on the cuts and slopes along 900 m long section of the frequent county road Kistanje-Oklaj in the Krka Nation Park, Croatia is presented. Identification of discontinuities was conducted by conventional field mapping and by interpretation of digital surface models derived from the high-resolution point cloud data obtained with the terrestrial laser scanning and unmanned aircraft system (TLS and UAS). The Split-FX software was used to extract discontinuity surfaces semi- automatically from the point cloud data. Spatial kinematic analysis was performed for each triangle of TIN surface model of the investigated cuts and slopes to identify locations of possible instability mechanism. The aim of the paper is identification of the most critical parts on the cuts and slopes for occurrence of plane, wedge, flexural and block toppling failure using Kinematic Hazard Index (KI). Verification of identified rock fall areas is performed by visual inspection of hazardous blocks in the point cloud model. Identified rock fall prone areas, unstable blocks and probable instability mechanisms on the investigated road cut and slopes above, present the input data for determination of critical positions for further deterministic slope stability analysis. It is concluded that the KI is useful tool for zonation purposes in the early phases of detailed investigations necessary for rock slope protection measure design.

Rock fall, Split-FX, Discontinuity extraction, Kinematic Hazard Index, Krka National park (Croatia)

nije evidentirano