Abstract
For a numerical method for the excavation problem in rock mass to be adopted in the design and construction of, for example, a large-scale cavern, its input data must be determined from geological survey and in-situ test objectively. The present paper proposes a method to determine the input parameters for the MBC model from measured convergences during tunnel excavation. The tunnel excavation preceding, for example, a large-scale cavern excavation is regarded as an in-situ stress relaxation test. The proposed method is applied to the measurement data at the Kazunogawa power station constrcuted by the Tokyo Electric Power Co. Inc. It is shown that the estimated dip angle agrees with the reported value.
