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基于现浇X形桩在任意方向轴惯性矩控制方程和异形几何截面特性以及地基反力法的基本原理,分析X形桩在任意水平向荷载作用下截面应力分布规律及其控制参数变量对截面应力集中现象的影响规律,并与同等情况下等周长和等面积的圆形桩、方形桩的力学特性进行对比分析,提出考虑截面应力分布的X形截面设计最优化设计形式,为X形桩截面形式设计提供参考依据。研究结果表明,等面积情况下,X形桩截面的应力随着外包圆直径的增大而减小,随着开弧间距和开弧角度的减小而减小;等周长情况下,X形桩截面的应力随着外包圆直径的增大而减小,随着开弧间距和开弧角度的减小而减小。实际工程中建议外包圆直径可以取0.5～0.7 m左右,开弧间距取0.1～0.2 m左右,开弧角度采用110o～130o左右。
Based on the governing equations of the inertia moment and the geometrical cross-section of the in-situ X-shaped piles in arbitrary direction and the basic principle of the foundation reaction force method, the stress distribution of the X-shaped piles under arbitrary horizontal load and the influence of the control parameters on the cross- Stress concentration phenomenon, and with the same circumstances such as circumferential and equal area of the circular pile, square pile mechanical properties were compared and analyzed, taking into account the cross-section stress distribution of the X-shaped cross-section design optimization design form, X-shaped The design of pile section form provides reference. The results show that under the condition of equal area, the stress of X-shaped pile section decreases with the increase of the diameter of the outer circle, decreases with the decrease of the arc-opening distance and arc-opening angle; The stress of the cross-section decreases with the increase of the diameter of the outer circle, and decreases with the decrease of arc-opening distance and arc-opening angle. In the actual project, it is suggested that the diameter of the outsourcing circle should be about 0.5-0.7 m, the spacing between arcs should be about 0.1-0.2 m, and the angle of arc opening should be about 110o ~ 130o.