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在分析推扭荷载下群桩基础工作机理的基础上,根据静力平衡条件建立了以转心为参照点的各基桩位移及转角普适方程。采用p-y曲线法与单桩扭转刚度计算理论分别确定各基桩的水平刚度与扭转刚度,并提出了各计算参数的取值方法。然后,建立出推扭荷载群桩内力与位移的解算流程,编制了相应的计算程序。与试验数据的对比表明,文中方法计算结果与实测结果吻合较好,且计算过程简单,具有工程实用性。最后,采用计算程序对推扭耦合作用下群桩基础进行了失稳破坏分析。结果表明,当荷载偏心距变大时,同等量级荷载下群桩转角即随之增大,偏心距对承台转角的影响更明显,而影响群桩水平位移的主要因素则是水平荷载及桩头水平刚度。
Based on the analysis of working mechanism of group pile foundation under the condition of push-torsion load, the displacement and angle universal equation of each pile with reference to the turning center are established according to the static equilibrium condition. The p-y curve method and the calculation theory of torsion stiffness of single pile were used to determine the horizontal stiffness and torsional stiffness of each pile separately. The calculation methods for each parameter were proposed. Then, a solution procedure of pushing internal forces and displacements of pile groups is established, and a corresponding calculation program is compiled. The comparison with the experimental data shows that the calculated results in the paper are in good agreement with the measured ones, and the calculation process is simple and practical. Finally, the calculation program is used to analyze the failure of the pile foundation under the action of the push-torsion coupling. The results show that when the load eccentricity becomes larger, the turn angle of pile group increases with the same magnitude of load, and the eccentricity has a more obvious influence on the pile cap turning angle. The main factors that affect the pile group horizontal displacement are horizontal load and Pile head horizontal stiffness.