DBPapers
DOI: 10.5593/SGEM2014/B13/S3.052

NEW METHOD TO FEED FILLING MATERIALS INTO SHAFTS WITH DIRECTING TUBULAR TANKS

S. Prusek, S. Bock
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 395-402 pp

ABSTRACT
Shafts closure is most often conducted by filling it with a grainy material fed into the shaft with a conveyor or directly from a lorry. Unfortunately, during the shaft closure, the selected filling material degrades, and the composition of the grain size changes. Such refined material may not meet the requirements posed to maintain filtering properties in the backfill column. That paper presents new method of feeding material into the shaft. It enables to limit the degree of degradation of a filling material, which is especially important in case of materials of low strength. The described solution limits damage to the lining of a shaft and its equipment by directing the filling material to the bottom of a shaft. Addition of water increases consolidation of the filling material, which facilitates its flow during backfilling. Moreover, water significantly limits sparking when such materials as granite or slag are fed. The verification of proposed method was performed using numerical analysis (Bonded Particle Model implemented in the PFC3D code).

Keywords: Shaft closure; PFC3D; Numerical modelling; Material modelling; BPM