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中文摘要：
以江苏省南京长江第四大桥北接线工程N1标段现浇X形桩软基加固段为工程背景，建立了路堤荷载作用下现浇X形桩复合地基数值分析模型，开展了现浇X形桩复合地基承载机理的分析，并采用现场实测沉降曲线验证了分析方法的合理性。就填土期和运营期地基土固结对现浇X形桩桩身轴力和桩侧摩阻力的影响进行分析，探讨了褥垫层模量、褥垫层厚度、桩体模量、桩端土模量对桩身轴力、桩侧摩阻力和桩土应力比的影响。结果表明：随着路堤的填筑和地基土的固结，桩土应力比先快速后缓慢增加并逐渐趋于稳定，中性点逐渐下移；褥垫层模量和厚度的增加对调节现浇x形桩桩土应力分配有明显的作用；由于现浇x形桩为摩擦刚性桩，桩顶荷载主要由桩侧摩阻力承担，桩端土模量和桩体模量对桩身轴力和中性点位置的影响较小；路堤荷载下现浇X形桩的桩土应力比可在30左右，褥垫层模量建议取为20～50MPa，厚度为30～50cm。
英文摘要：
Based on the Fourth Nanjing Yangtze River Bridge section N1 of Jiangsu Province, the numerical analysis model of cast-in-place X-section （XCC） pile composite foundation under road embankment loading was established and the bearing performance of XCC pile composite foundation was analyzed. The rationality of analytical method was verified by the field measured settlement. The effects of filling and consolidation process on pile shaft force and shaft friction were analyzed. Moreover, the effects of cushion modulus and thickness, pile modulus, soil modulus on pile shaft force, shaft friction and pile-soil stress ratio were discussed. The results show that with the embankment filling and foundation soil consolidating, pile-soil stress ratio increases rapidly at first, then slowly increases and gradually tends to stability, the location of the neutral point of shaft descends gradually at the same time the increasing of cushion modulusof frictional and rigid pile, shaft friction bears main load on pile top, as a result, soil pile modulus have little influence on pile shaft force and position of neutral point. stress ratio of XCC pile under road embankment loading is around 30, the cushion to 50 MPa and the cushion thickness is 30 to 50 era. pile is a kind modulus and The pile-soil moduli are 20
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