多层地基中水平荷载桩计算m法的两种数值解

针对现行多层地基中水平荷载桩计算m法存在的问题,提出了按实际成层地基抗力系数采用有限差分法和弹性地基杆系有限单元法计算桩身位移和内力的方法,编制了全桩位移、内力计算和图形处理程序。实例计算表明:两种数值计算方法所得结果相当一致,且较现行换算地基系数法有更高的计算精度和计算效率,故两种方法均可直接应用于多层地基中水平荷载桩的设计计算与分析。

Two numerical solutions of laterally loaded piles installed in multi-layered soils by m method

Aimed at problems lying in the existing m methods for calculation of laterally loaded piles installed in multi-layered soils, the finite difference method and the pole system finite element method of elastic foundation beam with elastic links were presented in order to compute the displacements and internal forces by adopting actual modulus of subgrade reaction of layered soils. The computations and postprocessing of images for displacements and internal forces of piles were programmed. It was shown by computation and comparison of practical examples that the calculated results by the two numerical methods coincided very well. Meanwhile, the two methods were more precise and efficient than the existing conversion methods of subgrade modulus. Therefore, they could be directly applied to the design calculation and analysis of laterally loaded piles installed in multi-layered soils.