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Abstract of the Article

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Introducing a Weighed Harmonic Mean Formulation for Estimation of Compressive Strength of Jointed Rock Masses

Authors:
[ M. H. Bagheripour ] - Assistant Professor of Engineering Faculty, Civil Engineering Dept., Kerman University
[ S. M. Marandi ] - Assistant Professor of Engineering Faculty, Civil Engineering Dept., Kerman University
[ S. M. Marandi ] - M.Sc. Student of Geotechnical Engineering, Engineering Faculty, Civil Engineering Dept., Kerman University.

Abstract:

Deformability and strength of rock masses depend generally on various parameters such as intact rock strength, pattern and severity of jointing, as well as discontinuity shear strength. They are also dependant on other parameters like stress distribution, i.e. stress field. Anisotropy in the jointed rocks is developed due to joint orientation and is increased with the number of joints. Since there is a similarity between the equivalent resistance on electric circuit containing several parallel resistors and the rock masses containing several joints, therefore, a model is developed based on this similarity. In order to obtain the total strength of rock masses, a special weighed harmonic mean formulation has been proposed. To examine the efficiency of the model on the prediction of jointed rock strength, numerical method, particularly distinct element method (DEM), has been used. UDEC software was adopted for this numerical study and experimental results have been examined against those obtained by UDEC. Statistical regressions have also been used to develop a criterion to predict jointed rock strength. In this criterion several effective parameters such as joint orientation, joint number, as well as stress field have been considered

Keywords:

Rock Mass, Compressive Strength, Empirical Criterion, UDEC, Distinct Element