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中文摘要：
结合南京某污水处理厂软基处理工程，开展了现浇X形钢筋混凝土桩（简称X形桩）单桩竖向抗拔承载力现场试验，测得了荷载-位移关系曲线；基于FLAC3D软件建立了竖向上拔荷载作用下X形单桩、群桩特性分析的数值模型，并与现场单桩抗拔试验结果进行对比分析；比较研究了与等效圆形截面桩抗拔承载力的差异，并分析了基桩长度、桩-土摩擦因数以及基桩位置等因素对X形群桩力学特性的影响规律。研究结果表明：X形桩竖向抗拔承载力与其等外包直径的圆形截面桩承载力相近，较等混凝土用量的圆形截面桩承载力提高了近17．4％。
英文摘要：
Based on Nanjing Sewage Treatment Plant soft ground improvement engineering, field tests of X-section cast-in-situ reinforced concrete pile （referred to as XCC pile） under vertical uplift bearing capacity were carried out, in which the relation curves of load-displacement were measured. Numerical models for XCC single pile and pile group under uplift load were built by using FLAC3D software. The simulation result was compared with single pile field test result. Comparing analysis with the bearing capacity of circular piles under uplift load was carried out. Then, the mechanical properties of XCC pile group which were influenced by pile length, pile-soil fraction coefficient and pile position were analyzed and discussed. The study results show that the vertical uplift bearing capacity of XCC pile is relatively equals to that of circular pile with the same out-diameters, nearly 17.4% larger than that of circular pile with the same concrete volumes.
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