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目前有关预制混凝土管桩竖向承载力的计算公式较少,更无一种相对精确的计算方法.结合扬州某砂性土工程场地,通过单桩竖向承载力静载试验,分析了超长预制混凝土管桩的竖向承载特性,同时基于试验数据对比分析了规范公式及文献公式在砂性土地基中计算超长预制混凝土管桩承载力的可靠性.结果表明:在最大试验荷载作用下,8根试桩发生刺入性破坏,2根试桩发生缓变型破坏;超长预制混凝土管桩单桩承载力的确定,按照规范法计算可靠性大于文献法;采用3种公式计算所得的各试桩端阻比在16.15%~21.11%之间,表明该地区超长混凝土管桩为摩擦型桩.
At present, the calculation formula of vertical bearing capacity of precast concrete pipe piles is less, and there is not a relatively accurate calculation method.According to the static load test of vertical load capacity of a sand pile in Yangzhou, The vertical bearing capacity of precast concrete pipe piles and the reliability of calculating the bearing capacity of extra long precast concrete piles in the sandy soil foundation based on the test data and comparative analysis of the normative formula and the literature formula.The results show that under the maximum test load , 8 test piles piercing damage, two test piles occurred slowly changing damage; long precast concrete piles bearing capacity of the pile to determine, according to the normative method to calculate the reliability is greater than the literature method; calculated using the three formulas The end resistance ratio of each test pile is between 16.15% and 21.11%, indicating that the super long concrete pipe pile in this area is a friction type pile.