复杂环境或复杂结构下的群桩基础将受扭矩荷载作用,深入探讨受扭群桩工作性状,并建立相应计算理论十分必要。首先在分析受扭群桩变形与荷载分配特点的基础上,考虑实际工程中各基桩的刚度差异,提出采用3个参数(承台转心x坐标与y坐标、转角φ)描述各基桩位移量的方法,并基于力平衡条件解算承台转心位置及任意转角条件下各基桩所分配的水平荷载和扭矩荷载。引入p–y曲线法与单桩扭矩刚度计算理论分别确定各基桩的水平刚度与扭转刚度,考虑受扭群桩中基桩共同工作特性与扭矩–水平荷载耦合作用特性,结合现有的试验成果确定了相关计算参数的取值。根据该方法编制了相应的计算机程序,实例分析表明,本文程序计算结果与实测结果吻合较好。最后,对刚度不对称时群桩转心位置的偏移量进行了计算分析,获得了一些有益的结论。 The pile group foundation under complex environment or complex structure will be affected by the torque load. It is necessary to study the working characteristics of the twisted pile group in depth and establish the corresponding calculation theory. Firstly, on the basis of analyzing the deformation and load distribution characteristics of the twisted pile groups and considering the difference of the rigidity of each pile in the actual project, three parameters (the x coordinate and y coordinate of the bearing platform) Displacement method and calculate the horizontal load and torque load of each foundation pile under the condition of center of rotation and any corner of the platform based on the force balance condition. The p-y curve method and the single pile torsion stiffness calculation theory are respectively used to determine the horizontal stiffness and torsional stiffness of each pile. Considering the coupling behavior of the pile and the torque-horizontal load in the twisted pile group, The results determine the value of the relevant calculation parameters. According to this method, the corresponding computer program has been compiled. The example analysis shows that the calculated results in this paper are in good agreement with the measured results. Finally, the misalignment of the pile group at the center of rotation is calculated and analyzed, and some useful conclusions are obtained.