Sheorey, P. R. (1985) Support Pressure Estimation in Failed Rock Conditions. Engineering Geology, 22 (2). pp. 127-140. ISSN 0013-7952

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Ultimate roof support pressure estimates using a modern rock mass classification (Barton et al., 1974) are compared with the observed values in seven cases of squeezing ground. Since the agreement is not good, a modification of the classification method is suggested. Also given is a tentative approximate guideline for modifying the classification for obtaining wall support pressures. Assuming the failed rock surrounding an underground opening to behave as a Coulomb material, a semi-analytical elastoplastic method is proposed for calculating the ultimate support pressure. An earlier closed-form solution to the problem of stresses in the failed rock annulus assigns constant material properties through the failed rock zone, giving a discontinuity in the tangential stress at the failed—intact rock boundary. The semi-analytical method uses a step-wise gradual change of properties, eliminating the discontinuity. This method is shown to give reasonable estimates of support pressure if the peak and residual angles of internal friction are chosen from the classifications of Bieniawski (1976) and of Barton's (1974), respectively.

Item Type: Article
Subjects: Bord and Pillar Mining
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 13 Apr 2012 11:30
Last Modified: 13 Apr 2012 11:30

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