DBPapers
DOI: 10.5593/sgem2017/13/S03.075

NUMERICAL MODELLING OF BLIND EXCAVATION VENTILATION TAKING INTO ACCOUNT FAILURE ZONE

S. Kozyrev, P. Amosov
Monday 11 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7105-00-1 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 13, 591-598 pp, DOI: 10.5593/sgem2017/13/S03.075

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 – calculation of aerodynamics with applying a standard (k - ε) -turbulence model; 2nd stage – 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).

Keywords: blind excavations, leakage, numerical modelling