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支盘桩是近年来新应用的一种桩型,它相对于等截面桩而言具有较高的抗拔承载力和较小的上拔位移,具有良好的经济和社会效益,但是它作为一种新技术在理论研究上尚不够成熟。本文在已有的挤扩支盘桩研究成果的基础上,通过抗拔桩静载荷试验对上拔荷载作用下挤扩支盘桩的荷载传递性状进行了分析。试验结果表明:随着荷载的增加,由上往下各承力盘先后发挥其端承作用,各承力盘下端一定范围内侧摩阻力不能发挥出来。侧摩阻力的发挥也存在时间效应,自上而下逐渐发挥作用。
The branch pile is a kind of newly applied pile in recent years. It has higher anti-pull-bearing capacity and smaller uplift displacement than the equivalent section pile, and has good economic and social benefits. However, The new technology in the theoretical research is not yet mature enough. Based on the existing research results of crowded-expanded branch pile, this paper analyzes the load-transferring characteristics of the branch-expanded branch under the action of uplift load. The experimental results show that with the increase of load, the load bearing plates from the top to the bottom exert their bearing functions one after another, and the frictional resistance at the lower end of each bearing plate can not be exerted. Lateral friction also exerts a time effect, gradually exerting a role from top to bottom.