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.
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This research was funded by the China National Natural Science Foundation under grant number 51904092.
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Conceptualisation, Baohua Guo; Data curation, Baohua Guo, Jinbao Guo, Yan Chen and Chenlin Wang; Formal analysis, Jinbao Guo; Funding acquisition, Yan Chen; Methodology, Baohua Guo and Jinbao Guo; Writing – original draft, Jinbao Guo, Yan Chen and Chenlin Wang; Writing – review & editing, Baohua Guo and Jinbao Guo.
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Guo, J., Guo, B., Chen, Y. et al. A linear strength criterion for rock considering end-friction effect. Mech Time-Depend Mater 26, 939–953 (2022). https://doi.org/10.1007/s11043-021-09521-0
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DOI: https://doi.org/10.1007/s11043-021-09521-0