A Potential Strain Indicator for Brittle Failure Prediction of Low-porosity Rock: Part I—Experimental Studies Based on the Uniaxial Compression Test

In this paper, we have investigated the quantitative relationship between the axial strain threshold at the volumetric strain reversal point (e1cd) and the strain threshold at the peak stress (e1ucs) during the uniaxial compression tests. We found that normalized values of e1ucs/e1cd for different rock types are typically ~1.34(±0.24). This is especially true for igneous and metamorphic rocks, or low-porosity sedimentary rocks. To verify this...