Experimental Study on Creep Life of Granite under Direct Uniaxial Tension

Abstract

Experiments of direct tension creep on granite under uniaxial tensile stress condition were conducted to study the behaviors of long-term deformation and characteristics of acoustic emission. Test results indicate that there exists linear relationship between minimum strain rate and creep life on log-log coordinate, and that relationship between minimum strain rate and remaining creep life is also linear on log-log plot. According to the relationships, equations were developed to predict tension creep life of rocks. In the tertiary creep stage, there exists inversely-proportional relationship between axial strain and residual life, and the relationship was used to estimate residual life of a rock material.