复杂地基中桩基承载机理计算研究

对复杂地基中单桩承载性能进行进一步的分析探讨，分析比较了目前应用于桩基分析计算中的各种弹性理论法的适用性及局限性，建立了一套更接近实际的桩土体系模型，提出了一种新的计算分析复杂地基模型的桩基础计算分析方法——广义弹性理论法，与传递函数法、线性变形层模型、镜象法相结合，利用改进的Mindlin解，对复杂地基中桩基承载性能进行了计算研究。利用优化反分析方法所编制的正、反分析计算程序，不仅可计算复杂地基中桩身各点的荷载．沉降关系曲线，而且可以利用静载试验所得的荷载-沉降关系曲线，反演分析桩周和桩端土的力学参数值，用于指导同类型桩基工程的设计和施工。对大量的工程实例进行了分析计算，并与静载试验进行对比验证，得到了较为令人满意的结果。

CALCULATION AND STUDY ON BEARING MECHANISM OF PILE FOUNDATION IN COMPLICATED GROUND

The interaction mechanism of pile and soil in complicated ground is studied in detail. The limitation and applicability of different methods for solving this problem are analyzed and compared,based on which a new practical model of pile-soil system in multi-layer medium is set up. In combination with improved Mindlin solution,load transfer method,linear deformation layer model,mirror imagine method,optimization and back analysis method,a new generalized elastic theory method is presented to calculate and analyze complicated ground model. The optimization and back analysis program can not only be used to calculate and modify load-settlement curve of a pile,but also to analyze geo-mechanical parameters of ground-pile system on the basis of static load test results of a pile. The values of parameters can be used to supervise the design about bearing performance of a pile. The method and program are validated with engineering cases and proved to be satisfactory.