Spatial-Temporal Heterogeneity in the Deformation and Damage of Rock Samples: Experimental Study Using Digital Image Correlation Analysis

Abstract

In situ observations and laboratory experiments showed that slow deformation waves widely exist in geomedia under loading conditions. Slow deformation waves’ behavior exhibits some similarities in media ranging from the scale as large as the Earth’s crust to the scale as small as the laboratory test samples. However, the mechanism underlying their generation has not been clarified yet. In this research an experimental study was performed on small-scale red sandstone samples subjected to uniaxial compression at the displacement rates of 0.1, 0.5, and 1 mm/min. Slow deformation waves under different loading rates were analyzed by speckle photography for microscopic characterization combined with the digital image correlation (DIC) technique. The Luders deformation bands were predominantly observed in the flow channels formed at the stage of macro-elastic deformation. The spatial-temporal heterogeneity of the rock sample surface was quantified, and the deformation waves’ propagation velocities under different loading rates were obtained. The linear relationship between the propagation velocities of slow deformation waves and the loading rates was determined. The research findings shed some new light on the evolutionary characteristics of the slow deformation waves.

Dynamically triggered seismicity on a tectonic scale: A review

“…Qi et al proposed the phase transition model (Qi et al, 2017) and the generalized deformation model of geomedium with regard to the microstructure and phase transitions of deformation waves (Qi et al, 2022). Yan et al (2022) performed an experimental study on red sandstone samples under uniaxial compression at deformation rates of 0.1, 0.5, and 1 mm/min. They used speckle photography along with the digital image correlation (DIC) technique to analyze the evolution of deformation of the sample.…”

DIC-Based Hydration Absorption Detection and Displacement Field Evolution of Outcrop Porous Sandstone

“…Martin et al [23] analyzed the effect of four different tension levels on the strain/stress of the hole specimen based on the DIC system calibration procedure. Yan et al [24] carried out uniaxial compression experiments on red sandstone samples, analyzed the slow deformation waves under different loading rates, and combined them with DIC technology for microscopic characterization. However, when measuring rock deformation, there are few methods using non-contact measurement technology, and the research on using the DIC method to analyze the hydration absorption process of rock is not sufficient.…”