Preliminary results of plane-strain testing of soft rock

Joseph F. Labuz, Euripides Papamichos

Research output: Contribution to conferencePaperpeer-review

5 Scopus citations


A plane-strain apparatus for "soft" (unconfined compressive strengths below 35 MPa) rock has been designed and built at the University of Minnesota based upon a passive, stiff-frame design. The unique feature of the device is that no kinematic constraints are imposed on the formation of a shear band. By placing the upper platen on a linear bearing, the specimen has the freedom to form a failure mechanism consisting of two elastic bodies separated by a localized zone of deformation. Thus, the apparatus has the advantages of both direct shear and conventional compression testing.

Original languageEnglish (US)
Number of pages8
StatePublished - 1991
Event32nd U.S. Symposium on Rock Mechanics, USRMS 1991 - Norman, United States
Duration: Jul 10 1991Jul 12 1991


Other32nd U.S. Symposium on Rock Mechanics, USRMS 1991
Country/TerritoryUnited States

Bibliographical note

Funding Information:
This article is based upon work partially supported by the National Science Foundation (Grant No. MSS-8906185) and the Institute of Technology of the University of Minnesota. The plane-strain apparatus, with patent pending, was co-invented by J. Labuz, I. Vardoulakis, and A. Drescher.

Publisher Copyright:
© 1991 Balkema, Rotterdam.


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