复合锚杆抗拔桩承载性能试验研究

Experimental study on bearing properties of composite anchor uplift pile

本文所述的新型复合锚杆抗拔桩,是用于解决工程抗浮问题。这种复合锚杆抗拔桩具有造价低、承载力高、施工速度快的优点。为了研究新型抗浮复合锚杆的承载性能,在现场进行了三组足尺试验,通过在抗拔桩内设置钢筋计,测出各级荷载下桩身不同深度的应变,推算出其轴力和侧摩阻力,进而对抗拔桩的受力机理进行分析。分析结果表明,桩身不同的受力模式,其极限承载是有差异的,全桩身受压抗拔桩的极限承载力最大。在工程应用中,可以根据工程的要求选择合适的复合锚杆抗拔桩。

The new type of composite anchor uplift pile described in this paper is used to solve the problem of engineering anti-floating.This kind of composite anchor has the advantage of low cost,high bearing capacity,rapid construction speed.In order to study new composite anchor bearing character,three full-scale tests are conducted in the field.By setting the steel bar gauges in the uplift pile,the strains at different depths of the pile under different loads are measured,and it’s axial force and side friction resistance are calculated,and then the stress mechanism against the piles are analyzed,the analysis results show that the ultimate bearing capacity of piles are difference according to different loading modes.the largest is pile that the whole body compressive.In engineering application,suitable composite bolt uplift piles can be selected according to engineering requirements.