Abstract
Stability of underground openings is a major concern for the safety and productivity of mining operations. Rock mass classifications methods form the basis of many empirical design methods as well as form a basis for numerical analysis. Of the many factors which influence the stability of openings, span of the opening for a given rock mass condition forms a single parameter of design. In this paper, the critical span curves proposed by Lang, the Mathews' stability graph method, and the modified critical span curve obtained by the authors have been assessed. The modified critical span curve proposed by the author has been successfully used to assess the stability of wide underground openings in several limestone mines. (A) This paper was presented at Safety in the underground space - Proceedings of the ITA-AITES 2006 World Tunnel Congress and the 32nd ITA General Assembly, Seoul, Korea, 22-27 April 2006. For the covering abstract see ITRD E129148. “Reprinted with permission from Elsevier”.
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