大直径、超长钻孔灌注桩竖向承载性状的自平衡试桩法试验研究

GEOTECHNICAL ENGINEERING WORLD(2006)

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Abstract
采用自平衡试桩法检测了洞庭湖区两座在建大桥基桩的竖向承载力,并对试桩的竖向承载性状进行了综合分析.试验表明:该地区典型土层的极限侧阻力较大,而规范推荐值和地质报告值过于保守;钻孔灌注桩由于桩底沉渣的影响,桩底阻力的发挥需要较大的位移.提供了一桩径为φ2.2m,长65m的大直径超长灌注桩的分析实例.
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