Analysis of Failure Mechanics and Energy Evolution of Sandstone Under Uniaxial Loading Based on DIC Technology

Energy evolution process of rock deformation is conducive to essentially reveal the failure mechanism and great significance uncover breeding dynamic disasters in engineering. To characterize damage energy dissipation during failure, digital image correlation (DIC) technique proposed describe mechanics its process. The uniaxial compression experiment sandstone specimen was carried out, whole field characteristics had been captured by DIC system. Measurement accuracy verified fiber Bragg grating (FBG) sensor, elastic region divided according location strain localization band (SLB), analyzed. results show that time history development obtained FBG system matches identically, deviation peak axial both means less than 5%, which verifies applicability uncoordinated displacement discussed crack form under compression. revealed, releasable would be into three stages, correspond stress–strain mechanics. This study could provide an alternative analytical method for experimental research studies.