抗拔群桩变形计算方法研究

抗拔群桩基础的加筋和遮帘效应是客观存在的,只有对群桩进行直接整体的分析才能很好地考虑桩的这种效应。目前现有的群桩分析研究方法本身就有较多的近似性,而且如果同时考虑遮帘效应和桩的加筋将会对桩之间相互作用结果放大,不能真实地反映群桩的作用效应。为解决这一关键问题,对抗拔群桩基础中任意一根桩的上拔位移进行分解,基于弹性叠加原理提出了能同时考虑群桩的加筋和遮帘效应的抗拔群桩变形计算方法。将理论计算结果与有限元和模型试验结果进行对比,结果表明理论分析方法能较好地计算抗拔群桩的变形。该方法不但理论严谨简便实用,而且计算比较方便,适用于工程应用。

AN ANALYTICAL CALCULATION METHOD FOR UPLIFT GROUP PILES

The reinforcement and shadowing effect of uplift group piles foundation is objective existence, only for the directly whole analysis pile group can very well consider the effect of piles. At present, not only the existing analysis methods of group piles foundation are more approximate, but also the reinforcement and shadowing effect can not consider at the same time ,which causes the overestimating of the pile-pile interaction. In order to solve the key problem, the displacement decomposition of a single pile in uplift group piles foundation is carried out, and based on elastic superposition principle, the method for calculating deformation of uplift group piles foundation taking into account of the reinforcement and shadowing effect of piles is proposed. The calculated results of finite element and model test results are compared with the calculating results of the method proposed, the results shows that the theoretical analysis method can well calculate of the deformation of uplift group piles foundation. The method is strict in theory and simple in calculation, and has good engineering application prospect.