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The Mohr–Coulomb strength criterion is widely used in rock engineering; however, the end-friction effect has not been separately considered when its strength parameters are determined in laboratory experiments; thus, the strength parameters determined in the laboratory usually change with the end-friction condition. To study the end-friction effect on rock-bearing capacities, uniaxial and triaxial compressive tests were conducted on cylindrical sandstone specimens with different end-friction conditions. The results show that the axial bearing capacity under the same confining pressure increased with increasing end-friction coefficient. Under uniaxial compression conditions, the existence of the end-friction force induces a change of failure mode from shear to tensile failure, and the fracture angle of the specimen increased with increasing end-friction coefficient. A strength criterion for rock considering the end-friction effect is proposed to describe the total bearing characteristics of the rock including the consideration of the end-friction effect, the confining pressure effect and the rock material itself. The strength envelope of a rock material can be determined after the end-friction effect coefficient is known.
Mechanics of Time-Dependent Materials – Springer Journals
Published: Dec 1, 2022
Keywords: Rock mechanics; End-friction effect; Mohr–Coulomb strength criterion; End-friction strength criterion; Laboratory experiment
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