中文摘要：

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。

英文摘要：

The influence of design parameters including pile type ratio,pile diameter,pile length and pile spacing on the anti-liquefaction effect of multi-type-pile composite foundation with stone columns and cement-flyash-gravel piles（ CFG piles） was analyzed by three-dimensional numerical simulation. The numerical results showed that the antiliquefaction effect of multi-type-pile composite foundation was better than single-type-pile composite foundation. The pile diameter had great influence on the anti-liquefaction effect of multi-type-pile composite foundation. With the increase of pile length,the effect of pile length on the liquefaction resistance of multi-type-pile composite foundation was gradually decreased. For multi-type-pile composite foundation,when the ratio of CFG piles and stone columns was 5∶ 4,the anti-liquefaction effect was the best. It was suitable to select 4 times pile＇s diamter as the pile spacing of multi-type-pile composite foundation.