基于m法的高承台桩复合受力计算分析

为分析高承台桩竖向荷载对水平承载性能的影响,考虑桩身摩阻力、桩身自重及土抗力的影响,从弹性桩的挠曲微分方程出发,假定均匀地基土地基系数按m法线性增大,推导了在水平荷载、竖向荷载及弯矩共同作用下基桩的内力和位移的幂级数解答。结果表明:在桩头自由长度较小的情况下,竖向荷载的作用能稍微提高管桩的水平承载性能,随着自由长度的增加,竖向荷载的作用引起基桩的P-Δ效应,但影响不大,可忽略不计。

Calculation Analysis of Composite Stress of High Cap Pile Based on m Method

In order to analyze the effect of vertical load of high cap pile on its horizontal bearing capacity,power series solutions for foundation pile inner force and displacement under combined effect of horizontal and vertical load and bending moment are educed according to the elastic pile＇s differential equation by considering pile frictional resistance,pile deadweight and soil resistance,assumed that uniform soil foundation coefficient is in linear increase according to m method.It is shown that horizontal bearing capacity of tube pile can be slightly improved under the presence of vertical load when pile head free length is small.With the increase of free length,foundation pile P-Δ effect is produced by vertical load,but the influence is little and can be neglected.