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为了分析结构桩在邻近堆载作用下的受力特性,以条状梯形分布堆载为代表,基于布西奈斯克弹性理论解得出堆载作用下地基附加侧压力表达式,并据此通过对局部塑性变形理论模型的改进,推导得出桩前土体侧移作用下桩身实际附加荷载,同时考虑土体可能发生绕桩流动的极限状态,结合绕桩极限模型给出桩身被动荷载的合理确定方法;在此基础上,考虑地基土体塑性屈服和桩顶结构荷载的影响,基于三参数Winkler弹性地基梁模型,建立桩身自由段、被动受荷段和主动作用段的微分方程,并通过桩身离散与矩阵传递法给出结构桩被动受力特性的半解析解。实测结果、文献理论解与该解答的对比分析,验证了本文计算方法的可靠性。
In order to analyze the stress characteristics of the pile under the action of adjacent stowage, the stress expression on the additional side of the foundation under stowage is obtained based on the Boussinesque elastic theory. Based on the improvement of the local plastic deformation theory model, the actual additional load of pile under lateral displacement of piles is deduced. At the same time, the limit state of the pile around the piles may be considered. Combined with the winding limit model, the passive loads On the basis of this, considering the plastic yielding of foundation soil and the influence of pile-top structure load, the differential equation of the free-body section, passive-loaded section and active section is established based on the three-parameter Winkler elastic foundation beam model. The semi-analytical solution of the passive stress behavior of the structure pile is given by the pile body dispersion and matrix transfer method. The measured results, the literature theoretical solution and the comparison of the solution, verify the reliability of the calculation method.