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通过数值模拟,探讨桩型配比、桩径、桩长、桩间距等设计参数对碎石桩与水泥粉煤灰碎石桩(CFG桩)构成的多桩型复合地基抗液化性能的影响。计算结果表明:与单类型桩复合地基相比,相同条件下,多桩型复合地基的抗液化效果更显著;桩径对多桩型复合地基抗液化效果的影响较大;随桩长的增加,桩长对多桩型复合地基抗液化效果的影响逐渐减弱;当CFG桩与碎石桩的桩型配比为5∶4时,多桩型复合地基抗液化性能最优;多桩型复合地基的桩间距宜取4倍桩径。
Through numerical simulation, the effect of design parameters such as pile ratio, pile diameter, pile length and pile spacing on the liquefaction resistance of multi-pile composite foundation composed of gravel pile and cement fly ash gravel pile (CFG pile) was discussed. The calculation results show that the anti-liquefaction effect of the multi-pile composite foundation is more significant than that of the single-pile composite foundation. The effect of the pile diameter on the liquefaction resistance of the multi-pile composite foundation is greater, and the length of the pile increases. The effect of pile length on the liquefaction resistance of multi-pile composite foundation gradually weakens; when the ratio of CFG pile to gravel pile is 5:4, the multi-pile composite foundation has the best anti-liquefaction performance; The pile spacing of the foundation should be 4 times the pile diameter.