Abstract:

Uniaxial loading tests of rock specimens with double parallel inclined closed cracks were conducted on a micro-controlled electro-hydraulic uniaxial loading system. The analytical expression of stress intensity factor (SIF) is derived in this paper. The influence of surface friction coefficient of crack on the stress intensity factor of specimens is analyzed. The process is studied using the finite element method (FEM) method, and the results compared with the analytical solution. The results show that SIF decreases with the increase of surface friction coefficient of crack. It is feasible to use FEM to solve stress intensity factor and the safety of containing crack component can be accurately predicted. In addition, the failure macro-mechanism of specimens is discussed.

Key words: uniaxial compression; closed crack; stress intensity factor; friction coefficient