Experimental Study on Dynamic Characteristics of Annular Coal Mine Sandstone after Different Temperatures

The rock mass is the main carrier of underground engineering. Many engineering involves excavation, and temperature deep increases with depth rising. study on dynamic mechanical properties annular coal mine sandstone under different temperatures has important guiding significance for excavation design construction. To research effect high physical characteristics specimens, parameters samples after heating from 25°C to 500°C were tested, splitting tests same loading condition conducted by using SHPB test equipment. findings indicate that rising, volume increases, density decrease, change rate sample a little greater than intact sample; as goes up, tensile strength first then decreases, there quadratic polynomial relationship temperature; both strain average decrease increase grows, showing damage degree become worse improved, fragments specimen obviously 200°C.