Dynamic Splitting Behavior and the Constitutive Relationship of Frozen Sandstone Containing a Single Fissure

Fractured sandstone is widely distributed in mining areas throughout western China where the artificial freezing method extensively adopted to construct vertical shafts. Blasting and excavation generate stress waves break frozen fractured sandstone. Among failure modes of rocks, tensile very common. In this study, dynamic strength samples with four crack inclination angles (0°, 30°, 60°, 90°) tested by using a split Hopkinson pressure bar at subzero temperatures (−5, −10, −15, −20°C). Accordingly, damage constitutive relationship that considers effect fissure angle temperature established. The results show following: (1) does not significantly affect but mainly affects mode sample. (2) has negative linear correlation temperature. (3) When small, only cracking occurs; when large, occurs along both loading direction fissure; shear as well. (4) Regardless angle, initiated stress-concentration zone then propagates towards end. Fissure ice provides resistance deformation propagation which coalescence mode. A established considering effects on properties sandstone, proven be highly reliable reference basis study mechanical similar rock types.