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.