BEARING CAPACITY AND DEFORMATION VERIFICATION OF GROUND IMPROVED COMPACTION METHOD BASED ON PERFORMANCE-BASED SPECIFICATIONS FOR OFFSHORE AIRPORTS

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  • 海上空港の性能規定に基づく締固め工法により改良された地盤の支持力及び変形照査

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<p> Ground improved by compaction method to prevent liquefaction of sandy soil may not reach the required N-value after improvement due to the spatial variability of the soil to be improved or other reasons. In some cases, such as airport facilities with large improvement areas and complex soil types, it is difficult to evaluate the entire improvement block as a whole because the N value differs for each boring after improvement. Therefore, in this paper, the distribution of 𝐹𝐿 is represented by random field theory for a partially compacted improved ground that does not reach the required N value. Then, bearing capacity and deformation analyses considering spatial variability of the improved ground were conducted by Monte Carlo simulation using the finite element method. Based on the results, we proposed a method for verifying the bearing capacity and runway surface deformation (gradient) under aircraft transportation, which are required for airports after the event of a large-scale earthquake. As a result of the bearing capacity and deformation verification for Airport A, it was judged that the required bearing capacity and deformation performance after the earthquake were satisfied. In the future, we would like to propose a simplified method to determine the bearing capacity and deformation based on the performance-based specifications for the target ports and airports by adding case studies in which the FL distribution is varied.</p>

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