Abstract
Results of geomechanical research of burst hazard of the rock mass of Rasvumchorr mineral deposit with application of measuring complex are presented in the paper. Measuring complex includes the automated seismoacoustic system of rock pressure control "Prognoz-ADS" and the local geoacoustic device "Prognoz L". The measuring complex was developed in Mining Institute of the Far Eastern branch of Russian Academy of Sciences. Measurements and the analysis of parameters of the seismoacoustic events reflecting geomechanical processes in the developed massif is the basis for estimation of rock massif burst hazard.
Highlights
The problem of rock pressure control is one of most difficult and important tasks in underground mining of mineral deposits
The “Prognoz-L” device carries out the registration of impulses of the elastic vibrations radiated in the course of irreversible rocks deformation, determination of the acoustic emission parameters and calculation of indexes and criteria of burst hazard with delivery of projections about a condition of the rock massif
High amplitude of the recorded impulses of AE reflects the beginning of processes of join of shallow cracks in larger ones that indicates the formation of burst hazard situation on this site of the rock massif
Summary
The problem of rock pressure control is one of most difficult and important tasks in underground mining of mineral deposits. The Rasvumchorrsky Mine has reserves of apatite-nepheline ores and performs mining preliminary works within mining lease of “Apatite Circus” and “Plateau Rasvumchorr” mineral deposits which are a part of the southwest ore field of the Khibiny massif [7]. These mineral deposits are 5.7 kilometers course, course of "Plateau Rasvumchorr" is 3.2 km and "Apatite Circus" is 2.5 km. Drawing drift are developed for the connection of all the ore-pass rising to the uniform system of ore transportation Their location depends on a block design. Distance between ore transportation developments is m for break and transportation of ore under the caved ore massif and up to 24 m under a hanging wall for the assessment of a stability of mine caves at manifestation of rock pressure
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