Variations in fracture toughness of SCB granite influenced by microwave heating

Abstract This technical description introduces a microwave-assisted mechanical rock breaking technology. After SCB granite is subjected to microwave action, the surface temperature of the rock rises. Due to the obvious difference in absorption of internal minerals, cracks on the rock surface began to appear and spread. The fracture toughness of SCB granite decreased significantly, with a decrease of about 35%, and the time required for fracture failure was shortened. Facts have proved that compared with other auxiliary rock breaking methods (such as heat conduction methods), microwave-assisted mechanical rock breaking is a convenient and efficient technology, which can improve the efficiency of underground rock breaking and has a wide range of application prospects.