ABSTRACT
As one of the widely used anti-liquefaction ground improvement techniques, the relevant Chinese standards mainly consider the densification effect of stone columns on the surrounding soil, but ignore the effect of stone columns on drainage and shear stress redistribution effect. Foreign standards and literature provide quantifiable calculation methods for the anti-liquefaction effects of densification, drainage, and shear stress redistribution effect, but there is a lack of systematic research on the test methods and evaluation of the comprehensive anti-liquefaction effects of this composite foundation. Based on the common calculation formulas, key parameters for assessing the anti-liquefaction effects of stone column composite foundations of sandy soil are refined, and potentially feasible testing methods are summarized for each key parameter. Taking the Tibar Bay Port Project (Timor-Leste) as an example, the inspection and acceptance process and comprehensive evaluation method of the anti-liquefaction effect of this composite foundation in coral sand in strong earthquake areas are proposed, which can provide a reference for the assessment of the anti-liquefaction effect in other similar areas. As per the analysis and research in this paper, when evaluating the anti-liquefaction effect of stone column composite foundations in strong earthquake areas, the three major anti-liquefaction effects of stone column, namely drainage, densification, and shear stress redistribution effect, shall be considered comprehensively.
