挤扩支盘桩的承载特性

结合具体工程对挤扩支盘桩在外荷载作用下的承载特性及桩身荷载传递规律进行了测试分析,现场测试结果表明:相对于传统等截面灌注桩,挤扩支盘桩具有承载力高、沉降变形小等优点;支盘的存在可以大幅提高桩体的承载力,支盘在单桩承载力中的贡献可达50%以上;支盘的存在,使得桩侧、桩端等部位承载力的发挥也明显不同于等截面灌注桩,具有明显的时序性;现行挤扩支盘桩单桩承载力计算方法偏于保守.

Bearing behaviors of squeezed branch piles

Based on a practical project, the bearing behaviors and load transfer characteristics of squeezed branch piles under external loads were studied. The filed investigations indicate that compared with the conventional bored piles with equivalent cross-sections, the squeezed branch piles are of advantages of high bearing capacity and small settlement. The existence of branches results in great increase of the bearing capacity of the piles and they have a contribution of more than 50% to the total bearing capacity of a pile. Due to the existence of branches the function of the bearing capacity at the side and end of the piles is different from that of the bored piles with equivalent cross-sections, and it is of obvious time sequence. The results of static load test show that the current design method for the bearing capacity of the squeezed branch piles is conservative.