大规模群桩基础相互作用近似解耦方法

发布时间：2018-07-25 12:56

【摘要】：针对传统弹性理论法过高地估计了桩-桩相互作用效应,基于杆件有限单元法建立了半无限土体中群桩基础的桩侧剪应力求解方程,通过简化桩-桩的相互作用效应,将群桩基础桩侧摩阻力的求解方程近似解耦,实现了群桩基础桩身剪应力和位移的快速求解目标。通过两桩相互作用系数以及柔性承台下群桩基础差异沉降的对比分析,验证了该简化方法的合理性。参数分析结果表明,该简化方法计算得到的相互作用系数与严格的边界积分方程法解答较为接近,稍小于Poulos弹性理论法的计算结果;柔性承台下群桩的差异沉降在桩间距较小时与经典解答较为接近,而在桩间距较大时则存在一定的差别。该简化方法大幅减少了群桩计算工作量,适用于大规模群桩基础的快速计算要求。
[Abstract]:In view of the traditional elastic theory method, the pile-pile interaction effect is overestimated. Based on the member finite element method, the pile-side shear stress equation of pile group foundation in semi-infinite soil is established, and the pile-pile interaction effect is simplified by simplifying the pile-pile interaction effect. The equations for solving the lateral friction of pile group foundation are approximately decoupled to achieve the goal of quickly solving the shear stress and displacement of pile body of group pile foundation. The rationality of the simplified method is verified by comparing and analyzing the interaction coefficient of two piles and the differential settlement of pile group foundation under flexible cap. The results of parameter analysis show that the calculated interaction coefficient of the simplified method is close to that of the strict boundary integral equation method, and is slightly smaller than that of the Poulos elastic theory method. The differential settlement of pile group under the flexible cap is close to the classical solution when the pile spacing is small, but there is a certain difference when the pile spacing is large. The simplified method greatly reduces the amount of pile group calculation and is suitable for the rapid calculation of large scale pile group foundation.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金(No.41172246,No.91315301-05)
【分类号】：TU473.1

【共引文献】