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Test procedures for nonlinearly elastic stress-relief overcores.
NTIS: PB 272 915, 1977; :1-9
The theoretical relationships that are used to calculate in situ rock stress magnitudes and directions from borehole deformation data obtained during overcoring are based on the assumption that the rock is a linearly elastic material. Strictly speaking, this assumption is not valid in any rock. Thus, investigators using overcoring techniques must either accept various degrees of nonlinearity and the associated inaccuracies or use core testing techniques that address the problem and compensate for elastic nonlinearity. Previously developed test procedures for stress-relief overcores partially correct for nonlinearity. This Bureau of Mines paper describes a test procedure that completely corrects for elastic nonlinearity in stress-relief overcores.
Mining-industry; In-situ-mining; Rock-mechanics; Elastic-properties
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 272 915
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division