Goel, R. K. (1998) Effect of Intermediate Principal Stress on Strength of Anisotropic Rock Mass. Tunnelling and Underground Space Technology, 13 (1). pp. 71-79. ISSN 0886-7798

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The Mohr-Coulomb criterion needs to be modified for highly anisotropic rock material and jointed rock masses. Taking ơ2 into account, a new strength criterion is suggested because both ơ2 and ơ3 would contribute to the normal stress on the existing plane of weakness. This criterion explains the enhancement of strength (ơ2 - ơ3) in the underground openings because ơ2 along the tunnel axis is not relaxed significantly. Another cause of strength enhancement is less reduction in the mass modulus in tunnels due to constrained dilatancy. Empirical correlations obtained from data from block shear tests and uniaxial jacking tests have been suggested to estimate new strength parameters. A correlation for the tensile strength of the rock mass is presented. Finally, Hock and Brown theory is extended to account for ơ2. A common strength criterion for both supported underground openings and rock slopes is suggested.

Item Type: Article
Subjects: Blasting
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 14 Jan 2012 05:14
Last Modified: 18 Feb 2012 07:34
URI: http://cimfr.csircentral.net/id/eprint/658

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