Laboratory tests on cyclic undrained behavior of loose sand with cohesionless silt and its application to assessment of seismic performance of subsoil

摘要

Geotechnical earthquake engineering in the recent times has been paying its special attention to such themes as performance-based design, liquefaction of sand with cohesionless fines, and seismic mitigation measures for residential areas. Because recent earthquakes in Japan and New Zealand caused many liquefaction problems in residential areas, the above-mentioned themes have become even more important than before. The present study conducted laboratory tests on sand with cohesionless fines in order to show how the seismic performance of loose subsoil is assessed, thus developing a practical methodology of performance-based mitigations. Most experimental data thus obtained is presented together with interpretations, and the mathematical framework for the performance assessment is described together with an example of specified mitigation methods.