【作者】 谢耀峰；

【导师】 王云球；

【作者基本信息】 河海大学 ， 港口、海岸及近海工程， 2003， 博士

【摘要】 在港口桩基工程领域，港口工程水平承载（群）桩的工作性状以及承载力计算方法，涨潮急流等动态荷载作用条件下码头基桩的受力性状，桩的作用荷载与变位趋势关系、桩的负摩擦等问题都要求作进一步的研究。本文致力于以港口工程桩基为主要研究对象，对港口工程（群）桩基水平承载力和负摩擦力进行研究，以更好地满足港口工程建设需要。 结合水平多循环桩模型试验和理论分析，发现双参数法可用于计算水平多循环（群）桩如靠船桩（容许发生较大的水平变位）。通过对模型桩的试验研究，得出了中细砂地质条件下双参数法的指数n的值一般在0.5-0.9。研究得出了计算纵向受荷排桩中各桩水平承载力不均匀分配效率系数公式和n根桩的总水平承载力公式。提出了群桩在砂性土中前桩对后桩土反力的影响折减系数公式，研究得出了水平承载桩（单桩、群桩）的计算方法。 在对粘性土P-Y曲线计算参数Y₅₀的研究中，对粘性土常规8个物理性质指标进行主成分分析，研究用人工神经网络分析预测粘土P-Y曲线中的Y₅₀。建立了神经网络计算模型，可用来计算预测粘性土P-Y曲线中的Y₅₀。 论文提出了在水平试桩未达极限状态时研判桩的水平作用荷载与水平变位相互关系趋势以及预测桩的水平极限荷载的H—S曲线延伸法与双曲线法。 论文对水平荷载下码头基桩的动力特性进行分析，用振动力学理论对码头施工中的基桩进行动力分析。提出涨潮急流下码头基桩内力的分析计算方法和基桩的振动分析方法，找出了断桩原因。 结合湛江港某码头工程基桩，用模型试验模拟现场地质情况，对港口单桩、排架桩基负摩擦力进行模型试验。研究得出港口码头桩基、排架桩基受到负摩擦力作用时的工作机理、发现新的规律，发现桩负摩擦力的性状和有利的工程施工措施，并提出港口单桩、排架桩基负摩擦力的计算方法。更多还原

【Abstract】 The further research in port engineering pile foundation is considered to be important of such as behavior and bearing capacity of laterally loaded single piles and pile groups, and the functional mode of wharf foundation pile under flood tide torrent, and load-deflection curve, and negative skin friction along the pile, et al .The bearing capacity and the negative skin friction of port engineering piles are analyzed, to satisfy port engineering development demand better.Combined with the experiment data, a series of studies have been performed on the behavior and failure mechanism of laterally loaded single piles and pile groups. Through the analysis and research of model piles test data in medium-fine sand, the value of the exponent n in medium-fine sand usually indicates 0.5-0.9 . An efficiency formula for non-uniformity of load distribution the longitudinal direction of pile groups and a total lateral bearing capacity formula of n piles are set up. The revising formula on p-y curves of the back pile subjected to the front pile in sand and the calculation method of laterally loaded single pile and pile groups are put forward. These formulas, which have practical value in piles calculation, are enough to meet piles calculation requirement.Artificial nerve network forecasted YSO in clay p-y curves is researched and 8 physical parameters are studied by using the principal component analysis methodWhen the fracture load was not reached for a trial pile under lateral load, the ultimate load of the pile might be predicted to the field-surveyed load settlement data of existing trial pile and by H-S curve extension method and hyperbola method.The dynamic characteristics of wharf piles subjected to lateral load is analyzed, used the dynamics theory. It gives an analysis and research to the functional mode of wharf foundation pile under flood tide torrent. The method of analyzing and calculating the internal force of wharf foundation pile and vibration analysis method for wharf foundation pile under flood tide torrent are advanced.The test of negative skin friction along the single pile or wharf bent piles, which is modeled after piles of ZanJiang harbor , is studied. The mechanism and some new work laws of negative skin friction along the single pile or wharf bent piles is analyzed. The engineering construction measure decreased the negative skin friction is presented. An improved empirical formula has been put forward for the calculation of the negative skin friction.更多还原