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为探讨非均质地基中V-T联合受荷桩的承载特性,考虑地面处桩周土体剪切模量为非零值且随深度呈幂函数分布,计入桩-土接触面处位移非协调性及加载顺序的影响,基于剪切位移法和桩身荷载传递函数建立桩身位移控制方程,并引入相应力和位移边界条件,导出桩周土体在不同受力状态下桩身的内力位移解析解,进而推导出不同加载顺序下V-T联合受荷桩的承载力,从而得到其承载力包络图。V-T联合受荷桩参数分析结果表明:桩身承载力随长径比L/D增大而增大,而随桩侧土体剪切模量与极限摩阻力分布常数比n、桩土弹性模量比λ增大而减小;桩顶所受扭矩T不断增大时,其能承受的竖向力V随之变小并最终趋于零,且T→V承载力包络线始终处于V→T承载力包络线内侧。
In order to investigate the bearing behavior of the VT combined piles inhomogeneous ground, consider the shear modulus of the soils around the piles as nonzero value and distribution with power as a function of depth, taking into account the non-coordinated displacement at the pile-soil contact surface And the loading order, the displacement control equations of pile body are established based on the shear displacement method and the pile load transfer function, and the boundary conditions of corresponding forces and displacements are introduced to derive the displacement of the pile body under different stress conditions Analytical solution, and then deduces the bearing capacity of VT combined piles under different loading sequences, and obtains the envelope of bearing capacity. The results of the analysis of the parameters of the VT combined piles show that the bearing capacity of the piles increases with the increase of the L / D ratio, while the distribution modulus of shear modulus and the ultimate frictional resistance ratio n, The volume ratio λ increases and decreases; when the pile top subjected to increasing torque T, its sustainable vertical force V becomes smaller and eventually tends to zero, and T → V bearing capacity envelope is always at V → T bearing capacity inside the envelope.