中文摘要：

运用MIDAS有限元分析软件,对挤扩支盘桩单桩竖向承载性能进行数值模拟,根据支盘直径与支盘间距的正交分析,对其相关变化规律进行了研究,并在此基础上进行了优化。模拟结果表明：在支盘间距相同时,桩的承载力随支盘直径的增大呈现先增大后减小的现象。在支盘直径较小时,桩的承载力随支盘间距的变化并不明显;在支盘直径一定时,桩的承载力多数随支盘间距的增大呈现先增大后减小的现象。经分析,在初选挤扩支盘桩的支盘直径与支盘间距时,对于支盘直径,可优先选择为桩径的2倍;对于支盘间距,首选支盘厚度的2~3倍为宜。

英文摘要：

The vertical bearing capacity of single squeezed branch pile is simulated with MIDAS.The orthogonal analysis between branch diameter and branch interval is done to obtain the changing law,and optimize the squeezed branch pile design.Simulation result shows that,the bearing capacity increases first and then decreases as branch diameter increases with the same branch interval.The bearing capacity of the piles doesn＇t change obviously as branches interval changes with small-diameters branches.The bearing capacity of the most piles increases first and then decreases as the branch interval increases with the same branch diameter.According to the results,in the primary selection of branch diameter and interval,the diameter prefers twice as the pile diameter,and the interval prefers twice to three times of branch thickness.