考虑桩侧双线性土抗力时长桩临界荷载计算

为了探讨目前工程中广泛使用的超长桩的临界荷载计算，考虑了桩侧土壤的弹性抗力，将桩侧土体的弹性抗力假定为由两部分组成，通过选择合适的桩柱挠曲变形函数，用瑞利-里兹法求解其临界荷载，分析桩周土抗力模式对超长桩的临界荷载及计算长度的影响关系。结果表明，桩的临界荷载主要取决于桩的入土深度、折减系数等系统参数。

Calculation of critical loads for long pile with lateral soil resistance

To investigate the calculation of critical load for super-long pile widely used in engineering, elastical resistance of soil on the side of pile is taken into account. The soil resistance on the side of long pile is assumed to consist of two parts. By choosing suitable wrapping function of pile, the critical load is solved by Rayleigh-Ritz method, and then the relations between resistance model and the critical load and calculated length of super-long pile are analyzed. The result shows that the critical load of pile depends on the length of pile in the soil, reduction coefficient and other pile-soil system parameters.