A Damage Constitutive Model of Rock Salt Based on Acoustic Emission Characteristics

摘要

The acoustic emission (AE) signal observation is a technique to observe the generation of microcracks in rock salt. By monitoring acoustic emission in whole process of stress - strain curve under uniaxial compression tests, the damage characteristic of rock salt is obtained. Damage to the rock salt appears to be mainly a shear failure under the condition of a lower loading strain rate. After shear failure, a lot of small crashed particles spread on the surface of the failure surface. The AE rate-strain curve is able to reflect the damage development process with better consistency which is evident from the stress-strain curve. A damage constitutive model of rock salt is suggested on the basis of acoustic emission characteristics.