Rock mechanical behaviors testing by digital speckle correlation method

Rock subjected to external force can produce deformation. Discovery and knowledge of the deformation information and stress distributions of rock play important roles in warning and avoiding the catastrophic failure. Digital speckle correlation method (DSCM) was used to measure the deformation, stress and strain of rock material by non-contact mode. In order to verify the validity of the experimental results, electronic resistance gauge (ERG) was adhered to the near picking area and the experiment results and ERG results agreed well. Through studying the mechanical behaviors of rock by DSCM, it indicates that DSCM technique can be used to measure the deformation of rock and forecast deformation information. The results can be given by quantitative or qualitative method.