Institute of Integrated Mineral Development–IPKON, Moscow, Russia:
K. N. Trubetskoy, Counselor, Academician of the Russian Academy of Sciences
S. D. Viktorov, Deputy Director of Scientific Work, Professor, Doctor of Engineering Sciences
A. A. Osokin, Senior Researcher, Candidate of Engineering Sciences, osokin_alex-r@mail.ru
A. V. Shlyapin, Senior Researcher, Candidate of Engineering Sciences

Under discussion are rockbursts and their conditions as well as the existing measures to reduce rockburst hazard in underground mining. Despite the diversity of rockbursting prevention and prediction techniques, new methods to control rock mass stress state and predict dynamic events is still the issue of the day. Different stages of mineral mining process are connected with the formation of different size particles, including a submicron range, which exerts aggravating influence on the environment. The major sources of industrial dust emission are mine shafts, open pit mines, processing plants, grading and handling stations, overburden dumps and ore stockpiles, tailings ponds as well as coal and ore storage areas. It is known that rock deformation and failure due to rock pressure or under blasting is connected with the initiation and growth of structural defects at different scales. This article describes testing of rock specimens, including recording of micron and submicron damages on their surface. The authors illustrate applicability of the phenomenon of submicron particle formation under mechanical loading in geomechanical control of rocks. The analytical solution on stress distribution around a cylindrical cavity in a specimen subjected to uniaxial compression is considered. The experimentation procedure is developed, and a new method to determine stress state alteration in rock specimen by means of recording of submicron particle formation on the specimen surface under uniaxial compression is presented. It is found that a jump in emission of submicron particles is an indication of impending micro-failure of a specimen. The research findings are of interest both theoretically and practically in the field of failure of solids, in particular, rocks, and are applicable to development of a new approach to stress state control in rocks by recording of dynamic events due to rock pressure with a view to predicting rockbursts. Thus, it is possible to obtain more information on rock mass condition using the new method, to design new equipment and to develop criteria for the assessment of hazardous situations connected with the dynamic events of rock pressure.
The study has been supported by the Russian Science Foundation, Project No. 16-17-00066.

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