Distribucija veličina i oblika blokova važna je karakteristika stijenske mase kojom se na temelju geometrijskih značajki diskontinuiteta opisuju očekivane veličine i oblici blokova, što je važno tijekom izvođenja bilo kojeg inženjerskog zahvata u stijenama. Procjena distribucije veličina i oblika blokova u ovom radu napravljena je pomoću postavljenog i proračunatog modela stijenske mase uzimajući u obzir setove diskontinuiteta utvrđene u kamenolomu “Ivanec” u blizini Zagreba. U proračunu modela stijenske mase korišteni su open source programi R i GNU Octave. Programska okolina R korištena je u segmentu statističke obrade podataka, dok je GNU Octave korišten u samom proračunu modela zasnovanom na teoriji blokova. Distribucija veličina blokova prikazana je u obliku granulometrijske krivulje, dok je distribucija oblika blokova prikazana na trokutnom dijagramu. Podaci o veličini i obliku blokova imaju svoju primjenu u sustavima kategorizacije stijenske mase, optimizaciji parametara miniranja, analizi stabilnosti iskopa u diskontinuiranim stijenskim masama, te odabiru tehnologije dobivanja mineralne sirovine.

Abstract: Distribution of sizes and shapes of blocks is an important characteristic of the rock mass which, based on the geometric features of discontinuities, describe the expected sizes and shapes of blocks, which is important during the construction of any engineering structures in the rocks. Assessment of the block sizes and shapes distribution in these thesis is made by rock mass model which is based on measured discontinuities in a quarry “Ivanec” near Zagreb. Open source programs R and GNU Octave were used in the calculation of a rock mass model. R programming environment has been used in the field of statistical analysis of data, while the GNU Octave has been used in the calculation of model based on the theory of blocks. The block size distribution is presented in the form of a block distribution diagram, while the block shape distribution is shown by triangular diagram. Informations about block sizes and shapes can be used in rock mass classification systems, blasting parameter optimization, stability analysis of excavations in jointed rock masses, and the selection of excavation technology to obtain mineral raw materials.