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中文摘要：
针对某桥梁为主跨480m的双塔组合梁斜拉桥，主桥桥址地质条件复杂，试桩是直径为2．5～2．8m的变截面钻孔灌注桩，对这种大直径超深钻孔桩基进行轴向静荷载试验。其方法为：采用白平衡法测试方案，荷载箱设黄存距桩端最仕位置3．5m处，试验中在荷载12～56MN内共设置9个级别；根据试验结果，对桩侧、桩端阻力与桩士相对位移进行拟合分析，同时，对各级荷载下岩层侧摩阻发挥系数C，进行反算，对桩侧各十层试验过程中并类参数进行分析。研究结果表明：衙载为25MN时对该类桩型的檐顶位移几乎没有影响，桩身侧摩阻力足以抵抗上部荷载：桩侧各土层实测时间一位移曲线与拟合曲线在加载后期均趋缓，表明擗侧摩阻力基本达到极限。
英文摘要：
Based on the fact that one bridge is a main span cable-stayed beam with 480 m twin towers, its bored pile diameter is 2.5-2.8 m and its geological conditions is complex, the self-balancing method was adopted. The processes were as follows. The load box best location was set 3.5 m away from the pile, and these tests were set 9 grades in 12-56 MN. According to the test data, pile section ＆ its tip resistance and relative displacement of soil were analysed. The results show that it almost has no influence on pile top displacement when the load is 25 MN, and the pile body side upper friction is sufficient to resist loads. The soil pile measured displacement-time curves and the fitting curves slow down in the loading stage, which indicates that skin friction basically reaches the limit.
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