Study on the Dynamic Splitting Mechanical Properties of Annular Sandstone Specimens with Temperature–Water Coupling in a Coal Mine

With the gradual deepening of mine excavation depth, strong disturbance deep strata becomes more and obvious. Rock’s failure under blasting mainly depends on its dynamic tensile strength. The changes in rock’s properties are obviously affected by temperature water. In order to study annular sandstone specimens influence water, was drilled, followed water bath tests at eight temperatures (25~95 °C). It can be seen from analysis test results that mass volume growth rates intact first increased then decreased, while density rate decreased increased. were smaller, but larger. Because increase temperature, compressive strength decreased. specimen lower. average strain peak also showed a quadratic function relationship decreasing increasing with temperature. value changed greatly. Brazilian disc validity condition is applicable two conditions specimens. Through XRD SEM analysis, we found not due their own material composition, damage structure caused temperature–water coupling effect.