IN-SITU ROCK MASS FAILURE ENVELOPE PLOTTING USING THE HOEK-BROWN CRITERION AND ROCDATA SOFTWARE TOOLKIT

The article presents the procedure to plot failure envelope and analyze physical and mechanical properties of in-situ rock mass using RockData software toolkit. General information is given for the commonly used strength criteria of Mohr–Coulomb and Hoek–Brown. The Hoek–Brown criterion parameters are discussed, as well as the purpose and the quantitative and qualitative estimation of these parameters using Hoek’s classification tables and diagrams is described. The criterion is determined based on the physical and mechanical properties of an intact rock mass; then, three deteriorating factors are included from the rock mass quality characteristic. While modeled, an intact rock mass is exposed both to natural and man-mad external effects. As a result, the rock mass strength characteristics included in the strength criterion worsen (uniaxial compressive strength σc, geological strength index GSI, material constant of intact rock mass mi, disturbance factor D and deformation modulus Ei) and approach properties of in-situ rock mass. The article describes a case study of calculating physical–mechanical properties and plotting failure envelope for enclosing rock mass of Taimyr gabbro–diorite mine with regard to local geology and structure. The equivalent Mohr–Coulomb parameters (cohesion с' and internal friction angle φ'), strength characteristics of rock mass (tensile strength, uniaxial compression, triaxial compression) and the modulus of deformation are found, as well as the type of failure is determined from Mogi’s line.

Keywords

Failure envelope, Hoek–Brown and Mohr–Coulomb strength criteria, geological strength index GSI, principal stresses, shear and normal stresses, rock mass, gabbro–dolerite.

Issue number: 12
Year: 2018
ISBN:
UDK: 622.272
DOI: 10.25018/0236-1493-2018-12-0-92-101
Authors: Khazhyylay Ch. V., Eremenko V. A., Kosyreva M. A., Yanbekov A. M.

About authors: Khazhyylay Ch.V., Student, e-mail: chod.872198@mail.ru, Eremenko V.A., Doctor of Technical Sciences, Professor of Russian Academy of Sciences, Director of the Research Center «Application of Geomechanics аnd Mining of Convergent Technologies», Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: prof.eremenko@gmail.com, Kosyreva M.A., Student, e-mail: marinkosyreva@gmail.com, Yanbekov A.M., Student, e-mail: yanbekov@mail.ru, Peoples’ Friendship University of Russia (RUDN University), Engineering Academy, 117198, Moscow, Russia.

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