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Κριτήρια αστοχίας βραχομάζας και ταξινόμηση πετρωμάτων

Aggelis Dimitrios

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Summary

The purpose of this dissertation is to study how to reduce the parameters of rock strength models that can be estimated from laboratory tests on intact rock for their application in larger scales of technical projects involving all kinds of discontinuities of a rock mass. Numerous researches have been carried out in the past four 10-years for the classification of rock masses in order to find quantitative estimates of degradation factors of their deformability and strength in relation to the deformability and strength of the unbreakable rock. The rock mass is affected by the discontinuities that cross it such as cracks, ramifications, layer levels, filling veins, folds, cracks, shear zones and magmatic veins. From the density, the extent and the orientation of the discontinuities and from the sizes of the main tendencies and their orientation, the strength of the rock mass is affected accordingly. This dissertation provides an extensive analysis of the Barton Q classification system among othets. This system was proposed in 1974 at the Norwegian Geotechnical Institute (NGI) by Barton and other researchers. It is used for the rock mass classification. Chapter 2 of this work deals wtih the concept of rock mass and its structure, while Chapter 3 analyzes the classification of rocks. Chapter 4 presents in detail the rock mass resistance models with emphasis on the Mohr-Coulomb, Griffith and Hoek-Brown criteria. Chapter 5 analyzes the methods of classification of rock mass with special emphasis on the Barton classification system (Q System). The application and analysis of the GSI system in a power station in Japan is also reported and analyzed. Finally, in the last chapter is the conclusion which states a general performance of the Q classification system.

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