Dynamic damage distribution in inclined shafts under high geostress during blasting excavation

This study investigates the blast-induced damage distribution in inclined shafts and surrounding rock masses at the Tianchi Pumped Storage Power Station, focusing on high geostress conditions during blasting excavations. By employing the numerical simulation capabilities of LS-DYNA, the study methodically assesses the influence of geostress and blasting parameters on the resultant damage, including the progressive impact of recurrent blasting sequences. The results elucidate that judicious modification of blasting parameters can efficaciously mitigate damage to the surrounding rock of both the excavation site and adjacent inclined shafts. In high geostress environments, an escalation in geostress markedly intensifies the extent of damage incurred during subterranean blasting excavations. Furthermore, successive blasting operations incrementally extend the zone of rock damage, albeit with a diminishing rate of expansion upon each subsequent detonation. This research contributes critical insights towards augmenting the safety protocols for blasting excavations within the inclined shafts of pumped storage power stations.