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http://dx.doi.org/10.7474/TUS.2018.28.4.358

Proposal of the Unsupported Span of Openings in the Domestic Underground Limestone Mines  

SUNWOO, Choon (KIGAM(Korea Institute of Geoscience and Mineral Resources))
Publication Information
Tunnel and Underground Space / v.28, no.4, 2018 , pp. 358-371 More about this Journal
Abstract
The stability of openings in the underground mine is major concern in the operation of mines that must ensure productivity and safety. Among many rock conditions affecting cavities stability, the width and height of the opening is an important design factor. In this paper, we consider to determine the maximum unsupported span of a opening in a limestone mine by using the Q system among several rock classification schemes. In order to determine the span of the unsupported opening in the limestone mine, rock mass classifications were carried out at over 200 sites in the underground limestone mines. The relationships by using the Q system and the stability graph proposed by Mathews to determine the maximum span of the unsupported opening were derived and compared. We propose a new classification method that combines GSI and RMR rock classification systems to make it easy to use in a field.
Keywords
Critical span; Stability graph method; Rock mass classification; Q system; Stability of underground opening;
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