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Study of elasto-plastic parameters of gneiss by unconfined compression tests

Chioni Filio-Andrianna

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Summary

The present diploma thesis is based on the experimental analysis of rock mass by performing uniaxial and Brazilian tests, consequently, on the crucial role of these results in the calibration of constitutive models. More specifically, through these experiments we obtain measurements for various parameters, such as their strength, strain, elasticity measures and Poisson's ratio, which can be considered representative of the rock mass if repetition of these findings is observed in future procedures. Initially, before the specimens were shaped to perform the experiments, the heights of the borehole, discontinuities and the general condition of the rock mass were used to calculate two rock mass classification indices. These indices are the RQD, determined from rock cores or by counting discontinuities, and the RMR, determined by the sum of the scores of several parameters related to the properties of the fractured rock mass. The samples were processed in accordance with established standards, following European specifications and subjected to the necessary experimental tests where different types of strain gages attached to the rocks, for better accuracy. Finally, from the uniaxial compression experiments, it was found that the maximum strength values ranged from 54.7 MPa to 112.1 MPa and very low radial plastic strength values were obtained.

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