Tensile properties of rocks in four-point beam tests under confining pressure

Ram Weinberger, Ze'ev Reches, Amir Eidelman, Thurman E. Scott

Research output: Contribution to conferencePaperpeer-review

25 Scopus citations

Abstract

The strength and elastic properties of rocks were measured with a fourpoint beam device placed inside a pressure vessel. The experiments were conducted with Tennessee sandstone, Indiana limestone, and Berea sandstone. The tensile Young's modulus is nonlinear and best represented by σt = A ϵt, where σt, ϵt are the tensile stress and tensile strain and A and B are constants. B ranges from 0.56 for tests without confinement to 0.85-0.9 for tests with confinement of 10 MPa or more. The tensile strength depends only slightly on the confining pressure and it ranges from -8.8 MPa to -5.1 MPa. The yielding envelope agrees with the parabolic shape predicted by Griffith. The fractures observed under 20 MPa of confinment are invariably tensile with no indication for transition to shear fractures (faults).

Original languageEnglish
Pages435-442
Number of pages8
StatePublished - 1 Jan 1994
Externally publishedYes
Event1st North American Rock Mechanics Symposium, NARMS 1994 - Austin, United States
Duration: 1 Jun 19943 Jun 1994

Conference

Conference1st North American Rock Mechanics Symposium, NARMS 1994
Country/TerritoryUnited States
CityAustin
Period1/06/943/06/94

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