大直径PHC桩竖向承载特性数值模拟研究

以珠海高栏港码头结构为工程背景,对码头的大直径PHC桩的数值模拟技术和承载特性进行研究。首先采用ABAQUS进行数值模拟,并将数值模拟结果与试验结果进行对比分析,验证了有限元分析的可行性,然后通过桩径、桩长,桩侧土和桩端土等一系列参数的变化,探讨这些参数对PHC桩Q-S曲线的影响。结果表明,有限元计算出的位移比实测结果高出2%~20%,桩长超过50 m的PHC桩属于超长桩。

Numerical simulation on vertical bearing capacity characteristics of large-diameter PHC pipe pile

In order to study the numerical simulation techniques and vertical capacity characteristics of large- diameter PHC pipe pile, based on high-piled wharf of Zhuhai Gaolan port, we conduct the numerical simulation on large-diameter PHC pipe piles of the wharf by ABAQUS, the result of which is validated by comparing with that by the field test. Then we study the vertical compression Q-S curves of PHC pile through changing the parameters of pile diameter, pile length, soil of pile shaft and pile toe etc. The results show that the displacement value of numerical simulation is about 2% to 20% smaller than that of the field test in the loading process, and the length of pile which is larger than 50 m belongs to super long pile.