DEFORMATION AND FRACTURE AROUND CYLINDRICAL OPENINGS IN ROCK - I. OBSERVATIONS AND ANALYSIS OF DEFORMATIONS

null null Elastic and inelastic deformation, fracture and failure around underground openings were investigated through experiments on thick-walled hollow cylinders of Berea sandstone and Indiana limestone, incorporating plane strain loading, the application of different stress paths, transference of the external pressure to infinity, and “freezing” of the fracture geometry under stress through metal saturation. This first of two parts discusses...