... strength can be as much as 1.93 times the uniaxial compressive strength for the range of confinement stress levels tested. INTRODUCTION The strength and behavior of rock under biaxial compressive loading condition is of both fundamental and practical significance. In both uniaxial and Hoek?s cell...

... ABSTRACT: An empirical criterion of intact rock failure under the general state of polyaxial compressive stress is developed. The criterion is shown to predict an elliptic failure envelope for the case of biaxial compression, and a parabola of the Hoek and Brown type for the case of triaxial...

... machine learning Upstream Oil & Gas brush bearing platen MPa Artificial Intelligence Rock mechanics test result Reservoir Characterization strength specimen biaxial compression reservoir geomechanics test specimen compression test loading system compression uniaxial...

... TEST Testing Procedure and Equipment The plane-strain test described in this paper is essentially one of biaxial compression (s³ = 0) with the intermediate principal stress, s², controlled in such a way as not to allow any deformation in its direction (e² = 0). A configuration of this principle...

...Chapter 5 INITIAL AND SUBSEQUENT FRACTURE CURVES FOR BIAXIAL COMPRESSION OF BRITTLE MATERIALS By B. Paul and M. Gangal It may be seen from Maurer's survey (Maurer, 1966) that most of the common methods used in rock drilling today depend upon mechanical loading of the rock. In order to predict...