ABSTRACT
The seismic response analysis is typically carried out to evaluate the seismic resistance of the civil engineering structure including the surrounding bedrock related to nuclear power facilities. The bedrock is conservatively assumed to be a linear material in the seismic response analysis. It is confirmed that the stress ratios (= stress/failure strength) occurring in the bedrock are within 0.5 from result of the seismic response analysis. Therefore, the multi-stage cyclic compression test of the rock was performed in order to confirm whether the bedrock is generally elastic against the stress ratio. As a result, it was confirmed that the stress-strain relation of the rock specimens were almost linear until the loading stage just before the failure and the elastic wave velocities of the rocks were not generally nearly decreased. Therefore, they has been shown it is reasonable evaluation method to assume the bedrock as a linear material.
