AN EXPERIMENTAL STUDY ON ADVANCEMENT OF DAMPINGPERFORMANCE OF FOUNDATIONS IN SOFT GROUNDPART2 EXPERIMENT FOCUSING ON DAMPING ANDANTIVIBRATION PERFORMANCE OF SIDE SURFACE OFFOUNDATION BLOCKS

摘要

To aim at progress of damping performance of foundations that will be built at soft ground, we haveproposed an improved foundation work of backfilling a damping material into trenches dug along a foundationsupported by improved soil medium. This damping material is a mixture of asphalt with crushed stones andrubber chips (MACSRC) and has itself high attenuation and mitigation performance. Not only to comprehendthe attenuation ability of the improved foundation work quantitatively and qualitatively but also to verify theeffectiveness of this work, we carried out forced vibration tests for two test blocks, which were constructed by anormal construction work and the above improved foundation work.According to the experiment results of the blocks by the normal construction work and by the improvedfoundation work that were excited by the vibration generator, magnitude of amplitudes of the latter became halfthan the former. Effectiveness in the attenuation performance of MACSRC was confirmed. When the block bythe normal construction work was vibrated, the improved foundation work decreased magnitude of amplitude ofthe adjacent block than the normal construction work. It is expected that MACSRC would exert mitigationability against earthquakes or other external and internal forces.