Study on Earthquake Resistance of Infrastructures against Fault-Induced Ground Surfece Ruptures

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The purpose of this research are as fellows ;1)The effects of the type of fault ruptures and the characteristics of the sandy deposit on the locations and the magnitudes of the ground surface ruptures are examined by model tests under 1 g and centrifugal conditions, case studies on past earthquake events and numerical analyses by non-linear finite element method.2)A numerical model for large deformation behavior analysis of buried lifeline facilities against fault-induced large ground deformations is developed by model test.The followings were obtained as the outcomes of this research ;1)The confining pressure of the ground strongly governs the location and the magnitude of the fault-induced ground surface ruptures. It was clarified that the model test under an actual high confining pressure by using a centrifuge is essential for this kind of study. The knowledge and the information for the prediction of the location and the magnitude of the ground surface ruptures were accumulated from the centrifuge tests. Those data can be utilized for the establishment of earthquake resistant design of civil engineering structures against fault-induced ground failures.2)A numerical procedure to predict the deformation and the stress of buried pipeline of lifeline systems against large ground failures was developed for the earthquake resistant design.