Investigation of the Effect of Block Geometry in Three-Dimensional Rockfall Analyses (Gölbaşı, Ankara) Üç Boyutlu Kaya Düşmesi Analizlerinde Blok Geometrisi Etkisinin İncelenmesi (Gölbaşı, Ankara)
Jeoloji Muhendisligi Dergisi, cilt.49, sa.2, ss.137-156, 2025 (Scopus, TRDizin)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 49 Sayı: 2
- Basım Tarihi: 2025
- Doi Numarası: 10.24232/jmd.1728155
- Dergi Adı: Jeoloji Muhendisligi Dergisi
- Derginin Tarandığı İndeksler: Scopus, Geobase, TR DİZİN (ULAKBİM)
- Sayfa Sayıları: ss.137-156
- Anahtar Kelimeler: 3D analysis, block geometry, Rockfall, UAV
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Ankara Üniversitesi Adresli: Evet
Özet
Rockfall is one of the most significant types of instability within discontinuity bearing rock masses, which might threaten the built environment and human life. Therefore, cautious investigation of discontinuity characterization and source rock areas should be performed. This study aims to investigate the effect of block shape on the results of 3D rockfall analysis within andesites located within Oyaca residential area in Gölbaşı, Ankara. Discontinuity surveys of andesites were performed, and the roughness profiles of several discontinuity sections were determined with a Barton profilometer. The southern slope of the hill is comprised of andesites and slope debris covers the western slope between the source rock and residential areas. Hand samples were collected for petrographic evaluations, unit weight and uniaxial compressive strength were tested in cores obtained from the blocks. The precise locations of the fallen blocks and potential blocks within the source rock area were identified using a digital surface map produced from a real orthophoto mosaic based on the photogrammetric method in unmanned aerial vehicle (UAV) studies. Three-dimensional rockfall analyses were carried out using both spherical and cylindrical blocks with respect to discontinuity orientations on the southern and western slopes of the hill. The spatial distribution of kinetic energy, total velocity, bounce height and rockfall risk were specified based on three-dimensional analyses for both slopes. It is concluded that the runout distance and kinetic energy of spherical blocks are higher when compared to cylindrical blocks; however, no distinct variation was observed in terms of bounce height.