Abstract
The stability of underground cavern is strongly controlled by joint distribution in the case of hard rock mass. Stochastic Block Theory has been suggested for the effective observational construction of large underground caverns. The probability of forming a removable block by the subsequent excavation can be obtained from actual field data for stochastic estimation of discontinuitiy distribution in the hidden region. In this study, the appropriateness and applicability of Stochastic Block Theory are verified based on the simulation results on one of the largest underground excavations in Japan.
