DBPapers
DOI: 10.5593/SGEM2014/B13/S3.027

EFFICIENCY OF USING LIGHTWEIGHT CONCRETE IN MINE WORKINGS OF THE NORTH

A. F. Galkin, A. A. Naumov
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, 199-204 pp

ABSTRACT
In this work, the contemporary problems of walling of underground mines of the North, related to the increased amount of air that needs to be supplied to the mine to ventilate it and operate it at its natural thermal mode, are considered. During the warm period of year, this leads to decrease in stability of rocks. In order to increase the stability of surrounding rocks, it is suggested that light shotcrete is used. Reports of positive experience with usage of such technology come from mines of Norilsk and South Yakutia. A method for assessment of economic efficiency of usage of thermal resistance layer on the mine walls has been presented. The method is based on comparison of expenses of creation of thermal isolation layer using regular concrete and the shotcrete. The basic formulas for comparative calculations have been defined. Nomogram, which allows to quickly determine the area of effective shotcrete usage on the basis of the price of thermal insulation material.

Keyword: light concrete, shotcrete walling, heat-protective walling, North mines, natural thermal conditions, opening strength, frozen rock, economic efficiency, calculation procedure.