Study on Mechanical Properties of Ring Sandstone Specimen under Temperature and Water Coupling Dynamic Compression

The excavation of hard rock roadways in coal mines is often the environment underground water and high ground temperature, it easy to be affected by dynamic load, which leads roadway destruction increases difficulty support. ring sandstone specimens with different inner diameters (0~25 mm) were treated temperature coupled, compression test was produced Hopkinson pressure rod device (SHPB). experimental results indicate that coupling effect reduces performance specimens. XRD showed composition did not change before after warm coupling, no new substances found. Dynamic properties weaken increase diameters. With increasing diameter specimens, energy dissipation per unit volume compressive strength decreases, degree breakage increases. Fracture morphology, average strain rate, peak diameter.