超长群桩的模型试验研究

针对超长群桩使用较多而深入研究较少的现状，设计并完成了不同桩间距的3组超长群桩模型试验。通过超长群桩模型试验数据分析了超长群桩的荷载传递机制和承载力特性，得到了超长群桩侧阻力与桩间距的关系、超长群桩承载力与桩间距的关系以及超长群桩效应系数与桩间距的关系。通过超长群桩轴力分布研究了超长群桩的有效桩长问题，其结果对于超长群桩的理论研究和工程应用具有重要参考价值。

Model test study of super-long pile groups

Considering the fact that the super-long pile groups are used very often and lucubrated less, three pile group models with deferent pile spaces are designed and done. Based on the model test data of super long-pile groups, the load transfer mechanism and the bearing behavior are analyzed. The relations between the pile group efficiency and pile spacing, between the pile capacity and pile spacing and between the skin friction and pile spacing are obtained. Through the axial force of super-long pile, the valid length problem is researched into. Results above are provided as important references to the theoretical research and technical application of super-long pile groups.