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Keywords: intermediate principal stress
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Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-003
... ABSTRACT: To clarify the effect of the intermediate principal stress on the strength and deformational behavior of rocks, three sandstones, marble, and shale were deformed under true triaxial stress state in which the intermediate principal stress is not equal to the minimum nor to the maximum...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 12–16, 1988
Paper Number: ISRM-IS-1988-011
... that rock strength is independent of the intermediate principal stress. This assumption implies that the yield surface is generated by lines parallel to the principal stress axes. Following experi- ments on hollowcylinders with external pressure and axial load, Obert and Stephenson(I965) sug- gested...

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