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港口码头工程建设将向外海开敞式发展,由于工程地质条件日趋复杂,在超厚软黏土地基上建设高桩码头面临重大难题。因持力层埋深较深,预应力高强度混凝土(PHC)管桩成为设计首选的超长桩基础型式。针对某军用码头85 m设计桩长的试桩进行了试验和数值计算,分析了超长PHC管桩承载力机制与传递规律,基于传递函数法提出改进的双曲函数计算模型,并对垂直静载试桩进行计算。结果表明:桩身轴力和桩顶位移的计算值与实测值吻合较好,证明提出的双曲线模型能够反映轴向承载PHC管桩桩-土相互作用实际情况,能够为软黏土中超长PHC管桩基桩设计提供依据。
Due to the increasingly complicated engineering geological conditions, the construction of port wharf will open to the outside sea. The construction of high-pile wharf on the ultra-thick soft clay foundation faces major challenges. Due to the deeper depth of holding layer, prestressed high-strength concrete (PHC) pipe piles become the first choice of ultra-long pile foundation type. The test and numerical calculation of the pile length of 85 m designed for a military terminal were carried out. The mechanism and transmission law of bearing capacity of the super-long PHC pipe pile were analyzed. An improved hyperbolic function calculation model was proposed based on the transfer function method. Load test pile calculation. The results show that the calculated values of pile axial force and pile top displacement are in good agreement with the measured values. It is proved that the proposed hyperbolic model can reflect the actual situation of pile-soil interaction of axially loaded PHC pipe pile, Pipe pile foundation design basis.