Geomechanical Models and Prognosis of Stress-Strain Behavior of Rock Ore in Development of Unique Deposits of Rich Iron Ores Under Water-Bearing Formations

Vladimir Leonidovich Trushko and Anatoliy Grigoryevich Protosenya

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/1973

ABSTRACT: This paper gives a brief mining and geological description of the Yakovlevo deposit of rich iron ores of the Kursk magnetic anomaly (Russia), which is one of the largest by explored reserves of high quality ores (9.6 billion mt) with iron content up to 69%. For the assessment of physical and mechanical properties of ores and enclosing rocks, a testing procedure was developed, and a non-linear geomechanical model for the assessment of stress-strain state of rock ore and rocks masses around workings was proposed on the basis of the study. Tangential stress concentration coefficients on working’s contour were calculated and zones of rock ore mass’s limit state were identified. The calculation data agree with those found by experiment, giving ratios between working’s breadth and roof arch height. Stress criterion for assessment of mine rocks around workings was developed, expressing the ratio of calculated stresses and calculated strength of rock mass, and recommendations were given on choosing kinds and parameters of supports for various stability categories of mine rocks outcroppings on workings’ contours.

KEYWORDS: iron ore; mines; mine rocks properties; geomechanical model; assessment of stability

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