Abstract
In order to solve the safety problems caused by in-situ stress unloading and blasting impact in blasting excavation of deep-buried rock mass, the initial stress field and dynamic response of excavation unloading of deep-buried rock mass are calculated by ANSYS implicit and explicit solver. The results show that the stress wave induced by in-situ stress unloading diffracts at the foot of the wall and produces stress wave superposition in the surrounding rock above the wall. The vibration of surrounding rock caused by excavation of buried rock mass consists of blasting shock and ground stress unloading. With the increase of excavation depth, the vibration of surrounding rock caused by ground stress unloading exceeds blasting effect and gradually dominates the measured vibration.
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