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由于刚性基础下的复合地基没有考虑桩土变形协调和土的沉降位移,桩土相对位移计算偏大,导致计算桩侧摩阻力值偏大而设计桩长偏小。针对复合地基传统设计方法的不足,建立了一个考虑桩土变形协调和土的压缩变形对桩体荷载传递影响的双曲线模型函数,以及建立了荷载从桩顶向下传递计算的方法,可更准确计算桩侧摩阻力及桩端荷载,桩底土层沉降采用切线模量法计算,以桩体压缩量及桩端土体沉降量为控制要求,进而可以确定满足复合地基承载力及沉降要求的单桩长度。通过工程实例验证,该方法计算得到的复合地基桩长与实际工程中桩长基本一致,为今后复合地基桩长设计提供参考。
Because the composite foundations under rigid foundation do not consider the coordination of pile-soil deformation and the settlement of soil, the relative displacement of pile-soil is too large, which leads to the calculation of pile-side frictional resistance value is too large and the designed pile length is too small. Aiming at the insufficiency of the traditional design method of composite foundation, a hyperbolic model function considering the influence of pile-soil deformation coordination and soil compression deformation on load transfer of pile body is established, and a method of transferring load from pile top to bottom is established. Accurate calculation of pile-side friction and pile-end load, pile-soil subsidence by tangent modulus method to calculate the amount of pile compression and pile-end settlement of soil as the control requirements, which can be determined to meet the composite foundation bearing capacity and settlement requirements Single pile length. The engineering example shows that the pile length of the composite foundation calculated by this method is basically the same as that of the actual project, which provides a reference for the design of pile length of the composite foundation in the future.