Geomechanics and Geotechnical Engineering

Bangbiao Wu, Kaiwen Xia

BANGBIAO WU, Ph.D. Candidate, e-mail: bangbiao.wu@mail.utoronto.ca, KAIWEN XIA (corresponding author), Professor, e-mail: kaiwen.xia@utoronto.ca, Department of Civil Engineering and Lassonde Institute, University of Toronto. Ontario, M5S 1A4, Canada

Dynamic Brazilian test on Laurentian granite under pre-stress conditions

Abstract: In this paper, a modified split Hopkinson pressure bar (SHPB) system is utilized to load Brazilian disc (BD) Laurentian granite samples statically, and then exert dynamic load to the sample generated by impact. Five groups of samples are tested under the pre-tension of 0 MPa, 2 MPa, 4 MPa, 8 MPa, and 10 MPa; and five groups of samples are tested under the hydrostatic stress of 0 MPa, 5 MPa, 10 MPa, 15 MPa, and 20 MPa. The result shows that the rock dynamic tensile strength decreases with the pre-tension, but increases with loading rate and hydrostatic stress; however, the increment of the tensile strength decreases as the hydrostatic stress becomes higher.
Key words: Dynamic tensile strength, pre-tension, hydrostatic, Brazilian disc, SHPB.

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