Abstract
Purpose. State-of-the art review concerning the effect of stress-strain state of the rock upon its resistance to mechanical breaking is represented. Methods. It is highlighted that while calculating efficient breaking modes of complex stressed rock and parameters of rock-breaking machine organs, it is required to consider the degree of natural stress of the near-face rock under breaking. Results. Necessity to take into account the rock stress degree has been substantiated as the index of breaking strength of stress-free rock samples differs considerably from the one obtained with the consideration of stress state of the natural rock mass. The simple strock in terms of rheology (i.e. linear-elastic one) has been analyzed. Scientific novelty. In this context, it is taken into consideration that simultaneous availability of all the components of stress tensor due to natural and external forces does not make the rock to be plastic. It means that the rock is within the frameworks of elastic deformations. In this context, potential deformation energy accumulated within the rock volume unit is specified as the basis to determine the reduced stress in terms of which the ultimate elastic state of that volume takes place. Practical importance The amount of cone feed to the bottomhole of stressed rocks is limited by the value of the safe penetration rate, depending on the degree of rock tension.
Published Version
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