INVESTIGATION OF SHALLOW GROUND LIQUEFACTION COUNTERMEASURE USING LOG PILE BASED ON SHAKING TABLE TEST

Abstract

 This study investigates the application of log piles as a shallow ground improvement technique against liquefaction for low-rise buildings. This method has recently gained attention for its potential to sequester carbon and mitigate climate change. The research conducted 1G shaking table experiments and needle penetration tests to evaluate the method’s effectiveness. The primary objective was to clarify the impact of pile length on the effectiveness of liquefaction countermeasures by varying the improvement depth while maintaining a consistent thickness of the liquefiable layer. The key findings from the experiments revealed several significant outcomes. Firstly, the penetration of piles resulted in densification in both the vertical and lateral directions of the surrounding soil. Secondly, even with shorter pile lengths, the liquefaction-induced settlement of the structure model was notably reduced compared to non-improved ground conditions. Furthermore, depending on the pile length, lateral ground displacement was suppressed, which contributed to a further reduction in settlement.