Time and Chemical Effects on Rock Sample Failure

摘要

Fracture mechanics principles and the subcritical crack growth theory have been used to study the impact of time and chemical effects on a stressed rock sample. Subcritical crack growth rates have been determined by laboratory experiments for specimens subjected to deionised water and saline brine saturated environments using Aspo diorite as the reference rock. The concept of subcritical crack growth was implemented in the fracture mechanics software FRACOD. The effect of the chemical environment on uniaxial tensile and compression tests was simulated by adapting crack velocity data obtained by laboratory test. The chemical effect and the effect of loading rate on peak strength ofA spo diorite was clearly captured by the numerical models.