Rock drill cylinder strain

Bulk modulus, compressibility These are the most common symbols we use Chalk Fracture Experiments. . It turns out that the “strength” of a geomaterial is a highly complex subject. There still remain issues on which experts are not in full agreement (e.g. scale. . Brittle beam bucking under high uniaxial local loads Crushing in breakout apex Destabilized column is “popping” out breakout . w of a joint or fault. Usually occurs only with high MW Slip plane s HMAX Axial extension fractures: s tensile failure when p w > High MW – Low MW . q Borehole surface spalling from high sq, perhaps arising from heating, low sʹ q [pdf]