Karparov, K. N.2018-11-272018-11-271998https://hdl.handle.net/10539/26120A Dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the Degree of the Master of ScienceDrilled specimens from four types of rocks, namely Quartzite, Norite, Sandstone and Coal encountered in the South African mining environment were tested to determine their fracture toughness coefficients, using International Society for Rock Mechanics (I...) standards. The tests were conducted using a MTS servo-controlled testing machine in displacement control mode. (Abbreviation abstract)enRock mechanics.Mining engineering -- South Africa.Rock pressure.Strains and stresses.Thesis