Revised Strength Factor For Coal In The Vaal Basin

The Southern African Institute of Mining and Metallurgy

J. N. Van der Merwe

Organization:: The Southern African Institute of Mining and Metallurgy
Pages:: 7
File Size:: 559 KB
Publication Date:: Jan 1, 1993

Abstract

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The South African coal-mining industry uses a uniform safety-factor formula for non-squat pillars, incorporating a coal-strength constant that was derived empirically by Salamon and Munro in the 1960s. The constant is 7,2 MPa. Since that time, collapses of pillars at relatively high safety factors have occurred in the Vaal Basin. Analysis of the post-1960s' collapses indicated that the strength constant for the Vaal Basin is 4,5 MPa. A crude method for the prediction of the minimum life span of pillars in the Vaal Basin is presented.

Citation

APA: J. N. Van der Merwe (1993) Revised Strength Factor For Coal In The Vaal Basin

MLA: J. N. Van der Merwe Revised Strength Factor For Coal In The Vaal Basin. The Southern African Institute of Mining and Metallurgy, 1993.

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