Failure energy evolution of coal-rock combination with different inclinations

Abstract

In order to study the energy evolution characteristics and damage mechanism of coal-rock assemblages with different inclination angles in the process of deformation and damage under different circumferential pressures. The test results show that: the damage of the specimens is mainly caused by bevel shear damage and tensile damage; the deformation and damage of the coal rock assemblage are distributed as a negative exponential function of the inclination angle, and the change of the surrounding pressure has a significant effect on the energy; based on the brittleness index value of the coal rock assemblage, the evolution of the brittleness index and Based on the brittleness index values, the evolution law between the brittleness index and the inclination angle and the surrounding pressure of coal rock assemblage is explored, and the mechanism of the change of inclination angle in the deformation and damage of coal rock assemblage with different inclination angles on the plastic yielding degree, energy dissipation level, crack extension and fracture speed in the pre-peak stage is revealed.