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中文摘要：
基于Davis一维非线性固结理论，求得桩周土体固结沉降随时间和深度变化的计算公式；结合桩一土双曲线荷载传递模型，建立复合地基中桩体平衡方程的矩阵表达式，通过将矩阵方程组联立迭代求解，得到复合地基中桩侧摩阻力、桩身轴力及中性点位置。通过针对某工程实例的对比分析，验证了本文中所建理论计算方法的可靠性；继而探讨了地基土固结度、桩周土体初始体积压缩系数、桩端土体压缩模量及桩-土应力比对桩侧负摩阻力和中性点位置的影响。研究结果表明：所建立的考虑土体非线性固结沉降的桩侧负摩阻力计算模型可以有效、准确地反映复合地基中基桩负摩阻力和中性点位置随地基土固结时间的变化规律；桩周土体初始体积压缩系数对桩侧摩阻力影响显著，桩端土体压缩模量对中性点位置影响显著；桩身下拽力、中性点深度随着桩-土应力比的增大而减小。
英文摘要：
Based on Davis one-dimensional nonlinear consolidation theory, the formulas for calculating the variation of soil settlement with time and depth were obtained. With a hyperbolic model of load-transfer for pile-soil interface, the equilibrium equations of pile in composite foundation were established and related matrix expressions were deduced. Pile skin friction, pile axial force and position of neutral point were obtained by iterative method. A case study proved that the proposed theoretical method was reliable. The influences of soil consolidation degree, the initial coefficient of volume compressibility, the stiffness of pile tip soil and the pile-soil stress ratio on negative skin friction and position of neutral point were also discussed. The results show that the computational model considering nonlinear consolidation of soil can effectively and accurately predict the variation of negative skin friction and position of neutral point with soilconsolidation time; the friction and the stiffness force on piles and depth initial of pil coefficient of volume compressibility significantly affects pile skin e of neut tip soil ral point Key words, road engineering; composite negative skin friction significantly affects position of neutral point; down-drag decrease with the pile-soil stress ratio.
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