Sheorey, P. R. and Das, M.N. and Bordia, S.K. and Singh, B. (1986) Pillar Strength Approaches based on a New Failure Criterion for coal Seams. International Journal of Mining and Geological Engineering , 4 (4). pp. 273-290.

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Abstract

Based on triaxial compression studies on eight coals, the well known empirical relation σ1= σc+a σ3b has been suggested as the best fit. The parametersa, b and internal friction μare shown to be interrelated. Values for μ given in Bieniawski's classification tables are used to obtaina andb for a given Rock Mass Rating (RMR), according to these interrelations. This procedure thus gives a simple failure criterion for rock masses. This non-linear failure criterion has been used in developing two independent pillar strength approaches, the first based on a Wilson type method (1972) and the second by estimating the total confining stress at the pillar centre. The performance of these new equations has been compared with some of the more popular strength formulae as tested against 16 failed and 27 stable pillar case studies. A nomogram is presented for pillar design based on the second approach developed.

Item Type:	Article
Subjects:	Bord and Pillar Mining
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	24 Mar 2012 07:04
Last Modified:	24 Mar 2012 07:04
URI:	http://cimfr.csircentral.net/id/eprint/1096

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