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针对基桩实际受力情况,采用数值模拟方法,构建了单桩和低承台多桩有限元模型,通过与相同地层条件、荷载条件及相同桩径的普通灌注桩进行对比分析,对挤扩支盘桩在竖向和水平荷载共同作用下受力性能进行了研究。结果表明,竖向上拔荷载和水平荷载存在明显的荷载耦合效应,挤扩支盘多桩中的群桩效应比等直径桩多桩显著,桩间距为5d时最小基桩效应系数为0.9。
According to the actual situation of pile foundation, the finite element model of single pile and low pile cap is established by numerical simulation method. By comparing with the same stratum condition, load conditions and ordinary pile with the same pile diameter, The mechanical behaviors of the branch pile under vertical and horizontal loads are studied. The results show that there is obvious load coupling effect between vertical pullout and horizontal load. The effect of pile groups in crowded pile is more than that of equal diameter pile. When the pile spacing is 5d, the minimum foundation pile effect coefficient is 0.9.