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NUMERICAL MODELLING OF BLIND EXCAVATION VENTILATION TAKING INTO ACCOUNT A FAILURE ZONE
Abstract
The paper presents numerical modelling results for ventilating a blind excavation, if there is a leakage into a failure zone. The leakage value of air seeping through the failure zone (binomial law of resistance) was estimated by a formula describing in-situ tests results at the Kola Peninsula mines. The blind excavation ventilation process was simulated based on a previously developed two-stage methodical approach: 1st stage пїЅ calculation of aerodynamics with applying a standard ?k ?? ? -turbulence model; 2nd stage пїЅ solution of a convectional-diffusion equation. Numerical experiments on the blind excavation ventilation were carried out for diapasons of air consumption in a main excavation from 6 to 50 m3/sec and a leakage from 0 to 0.07 m3/sec. The forecast result analysis of ventilation time for a blind excavation has allowed obtaining an analytical dependence of ventilation time as a function of air consumption in the main excavation and a leakage. The approved approach with slight modifications can be used as for other geometric dimensions of excavations, so for different types of initial conditions of gas contamination in a blind excavation (blasting operations, exploitation of equipment with IC-engine and etc).
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References5
Kozyrev S.A., Amosov P.V. Substantiation of minimal distance from the excavation face to the ventilation pipes // Labor safety in industry. 2012. №10. Pp. 79-83.
Kozyrev S.A., Amosov P.V. Modeling of air currents distribution in deep open pits // Eurasian journal. 2014. № 5. Pp. 7-11.
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Departmental Norms of Process Design 13-2-93 “Technological design standards for mining-metallurgy enterprises applying underground mining” // URL: http://files.stroyinf.ru/Data1/58/58119/
Alekhichev S.P., Puchkov L.A. Aerodynamics of failure zones and calculation of block air leakages // Nauka, Leningrad, L., 1968. 67 p.
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Number of times cited according to Crossref: 1
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