Strain Energy Release and Deep Rock Failure Due to Excavation in Pre-Stressed Rock

Deep rock engineering is in a high pre-stressed state before excavation. In this research, method to calculate the release of strain energy caused by excavation proposed. The normal stress after leads reduction specimens. influence height and width on inconsistent under vertical loading. When hole 1 mm, large, increase slow release. very small, an increasingly faster energy. This exponentially increases with lateral pressure coefficient, showing trend second power coefficient. Moreover, tunnel failure obtained numerical calculation. modes deep model are rockbursts tangential concentrations spalling release, which also observed mode actual tunnel.