It was found that the time-delayed failure for surrounding rock resulted from the damage accumulation with crack development during the creep process. For the theoretical method, the analytical elastic and elastoplastic models for deep tunnel cross section and the creep model for brittle rock material from a microscopic view were combined. The investigations are principally at the angle of time and space, which refers to the creep property and damaged scope for surrounding rock. In this research, the combination of theoretical approach and numerical simulation was employed to comprehensively understand the initiation mechanism of time-delayed rockburst and analyze the time-delayed failure laws for surrounding rock after excavation unloading without prompt support.
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