Long-span underground cavern excavation has been receiving wide application. This paper aims to give a theoretical study on the long-span underground cavern excavation as well as the damage zone of rocks subjected to various modes of blasting. Analysis is performed based on cylindrical wave theory with a start from blasting vibration and rock damage study, and then an optimized excavation method is proposed. Moreover, ultrasonic tests demonstrate validation of damage zone. It shows the proposed excavation approach is applicable.
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