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 language||English (US)|
|Number of pages||8|
|State||Published - Jan 1 1991|
|Event||32nd U.S. Symposium on Rock Mechanics, USRMS 1991 - Norman, United States|
Duration: Jul 10 1991 → Jul 12 1991
|Other||32nd U.S. Symposium on Rock Mechanics, USRMS 1991|
|Period||7/10/91 → 7/12/91|