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通过兰州某交通枢纽项目旋挖钻孔灌注桩静载荷试验与内力测试,分析了该旋挖钻孔灌注桩的荷载传递机理和承载特性。研究表明,桩顶荷载的大部分由桩侧阻力承担,桩端阻力只承担竖向荷载的一小部分;桩侧阻力优先于桩端阻力发挥;荷载-沉降(Q-S)曲线呈缓变型;该试验桩的竖向承载力明显高于一般钻孔灌注桩。
Through the static load test and internal force test of a rotating cast-in-place bored pile in a transportation hub project in Lanzhou, the load transfer mechanism and bearing characteristics of the bored pile are analyzed. The results show that most of the pile top load is borne by the pile side resistance and the pile end resistance only takes a small part of the vertical load. The pile side resistance takes precedence over the pile tip resistance and the load-settlement (QS) curve shows a gradual change. The vertical bearing capacity of test piles is obviously higher than that of ordinary bored piles.