文中结合某商业建筑项目,对大直径钻孔灌注桩进行竖向抗压静载试验,并分析钻孔灌注桩桩身的荷载传递行为.结果表明,钻孔灌注桩Q-s曲线呈现先近似线性增加后快速增加的趋势;卸载后位移回弹比例达到34.5%,大多数土体已经进入了极限状态;桩端阻力随着荷载的增加先小幅增加后快速增加;桩端阻力及桩端位移的关系曲线为先小幅增加后线性增加、最后趋于平稳阶段,线性增加阶段的曲线斜率为桩端阻力458.9 kN,桩端位移1 mm.
Field Test Study on Vertical Compressive Bearing Characteristics of Large Diameter Bored Pile
In this paper,combined with a commercial building project,the vertical compressive static load test of large-diameter bored pile was carried out,and the load transfer behavior of bored pile was analyzed.The results show that the Q-s curve of bored pile shows a trend of ap-proximate linear increase at first and then rapid increase.After unloading,the displacement rebound ratio reaches 34.5%,and most soils have entered the limit state.Pile tip resistance increases slightly at first and then rapidly with the increase of load.The curve of the relationship be-tween pile tip resistance and pile tip displacement is the stage of slight increase at first,linear increase and finally stable.The slope of the curve in the stage of linear increase is the pile tip resistance 458.9kN and the pile tip displacement 1 mm.
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