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The 2011 Great East Japan Earthquake caused significant soil liquefaction, and many residences were damaged as a result of associated settlement and inclination. This highlighted the importance of seismic countermeasures for small-scale structures. One such measure involves driving logs into the ground to add density. As trees store carbon during growth, logs placed underground below the water table are not prone to deterioration. Based on this characteristic, subterranean log piling represents a dual measure against both global warming and liquefaction. Since log piles can be set only in ground around existing houses rather than directly beneath them, the effect of the resulting densification is limited. However, rigidity added using this approach and the associated partial densification of soil can be expected to have a certain effect in suppressing ground deformation. In this study, numerical analysis was conducted to clarify the effects of log piles placed around existing houses.

SHAKING TABLE TESTS AND NUMERICAL ANALYSIS ON LOG PILING AS A LIQUEFACTION COUNTERMEASURE FOR EXISTING HOUSES