Essment of Geodynamical Stability of Mine Workings in Rock Ore

Olga Vladimirovna Trushko and Dmitriy Aleksandrovich Potemkin

The National Mineral Resources University (The Mining University) Russia, 199106, Saint Petersburg, 21-st Line V.O., 2

DOI : http://dx.doi.org/10.13005/bbra/1975

ABSTRACT: This paper studied the global methods to determine the geodynamical stability of mine workings in the conditions of dynamic forms of rock pressure during the development of deep horizons of mines. It was found that the available approaches to the assessment of stability and classification of rock outcropping require further development as they do not give quantity assessment of rock fragmentation at all stages of deformation near mine workings and do not account for mechanics of rocks during dynamic impact and the ability to control mechanical processes in rock mass at before- and over-limit deformation stages. On the basis of experimental research done at Russian mines of OAO Sevuralboksitruda it was found that the nature of rock fragmentation in the border zone depends on the parameters of seismic waves which are in turn caused by the energy of the dynamic effects. Energy classification of dynamic effects was developed, most fully disclosing the nature of dynamic impact on mine workings, improved strength criterion was offered and operational condition of mine workings was determined.

KEYWORDS: mine; mine workings; bump hazardous deposits; dynamic effects; stability criterion; rock ore; assessment of stability; seismic waves

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