基于截面分条法的“人”字形柔性桩结构试验研究

Experimental Study on Herringbone Flexible Pile Structure Based on Section Slice Method

利用桩截面分条计算方法对"人"字形柔性桩结构现场试验的数据进行分析整理,研究了"人"字形柔性桩结构在水平荷载作用下,桩身弯矩和轴力的变化规律、桩截面应力分布及桩身组成材料的荷载分担特征。结果表明:柔性桩结构的桩身弯矩分布具有明显的结构整体承载特征;桩身轴力受周围岩土介质等影响,其分布变化比较复杂;桩身轴力值一般比桩身弯矩值大一个数量级,说明"人"字形柔性桩结构能够充分发挥桩体材料性能;柔性桩截面内力主要由其中钢筋提供,即提高配筋率,可显著提高柔性桩截面内力。

The paper, analyzing and arranging the data of the field test of Herringbone flexible pile structure by slice method of pile section, is to study on the change of bending moment and axial force of the structure under horizontal load, stress distribution in pile section and load sharing characteristics of pile body material. The results show that there is obvious regularity of whole structure loading on the bending moment distribution of the flexible pile structure. The distribution change of pile shaft axial force, which is influenced by surrounding rock and soil medium, is rather complicated. Axial force of pile shaft is generally higher than the pile bending moment value of an order of magnitude, which shows that the Herringbone flexible pile structure can give full play to the performance of pile body material. The internal force of the flexible pile section is mainly provided by steel bar, which means that improving the ratio of reinforcement can obviously increase the internal force of the flexible pile section.