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A linear strength criterion for rock considering end-friction effect

A linear strength criterion for rock considering end-friction effect 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mechanics of Time-Dependent Materials Springer Journals

A linear strength criterion for rock considering end-friction effect

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Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature B.V. 2022
ISSN
1385-2000
eISSN
1573-2738
DOI
10.1007/s11043-021-09521-0
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Mechanics of Time-Dependent MaterialsSpringer Journals

Published: Jan 3, 2022

Keywords: Rock mechanics; End-friction effect; Mohr–Coulomb strength criterion; End-friction strength criterion; Laboratory experiment

References