과지압 하에 있는 대규모 지하공동의 지보 시스템에 관한 연구

A numerical stability analysis was conducted on the large oil storage caverns excavated in a rock mass under high initial horizontal stress. The behaviors of the surrounding rock mass, rockbolts, and shotcrete were analyzed and stability of the support members were assessed. For a proper support system design, the effect of the modelling technique, cavern shape and rockbolt length on the stability of the cavern was investigated. Results show that installation timing of supports and the change in cavern shape due to step-wise excavation affect the stress induced in support members. Also found was desperate need for a numerical technique which can properly reflect the behavior of the steel fiber reinforced shotcrete.