长短桩组合桩基础的模型实验

Model Test of Composite Long-Short Pile Foundation

设计了单桩、三桩、九桩及十五桩等4种(9组)长短桩组合桩基础的模型实验,介绍了实验方案设计、实验设备、实验方法与步骤、实验结果以及实验误差原因.实验结果表明,组合桩基础中的短桩承载性状没有明显变化,而长桩则明显受到短桩的影响,在正常工作条件下长桩承载性状明显不同于单桩,加载初期上半段侧摩阻力不能充分发挥,但随着荷载的增加至接近其极限承载力时上半段的侧摩阻力才能充分发挥,并达到其极限承载力时侧摩阻力.

A model test of the composite long-short pile foundation including single pile, three piles, nine piles and fifteen piles was put forward. Design of plan, measured instruments, methods and results about the model test, test results and factors of test error are also provided. The test data shows that the skin friction behavior of the short pile in the composite long-short pile foundation is almost the same as the single pile and that of the long pile is different from the single pile due to the significant effects by the short piles. At the beginning of loading the skin friction along the upper of the long pile does not work. By the end of the ultimate loading the skin friction along the upper of the long pile does fully play its role, the same as that of the single pile.