Loading diagrams and parameters of the model of elastic-pseudoplastic deformation of black shale rocks of the Bazhenov formation

The results of the analysis experimental data on pseudotriaxial loading full-size samples black shale rocks Bazhenov Formation are presented. experiments were carried out under conditions uniaxial and at lateral compression pressures 20 40 MPa. It is shown that in considered load range, deformation rock beyond elastic limit proceeds different modes: dilatancy compaction. Despite low porosity rock, transition from dilatation to compaction occurs a pressure not exceeding 34 Based obtained data, stages diagrams distinguished parameters mathematical model with combined limiting surface determined, which describes process modes.