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X形桩是一种具有反拱曲面的新型异形桩,该文以半无限体内受竖向集中力作用的Mindlin应力解为依据,通过沿X形桩桩周8个积分区间线积分,再沿桩长进行积分,得到了X形桩侧摩阻力沿桩身线性增长、沿桩周均匀分布、沿桩身矩形分布、沿桩周均匀分布侧摩阻力产生竖向附加应力系数的数值计算方法。通过沿X形桩截面3个积分区间面积积分,得到了X形桩均布端阻力在地基内产生竖向附加应力系数的数值计算方法。X形桩侧摩阻力和端阻力产生附加应力系数均随着外包方形截面边长和开弧间距增大而减小,随弧度数增大而增大。同周长X形桩侧摩阻力产生附加应力系数大于圆形桩,周长越大差别越大;同面积X形桩端阻力产生附加应力系数小于圆形桩,面积越大差别越大。
X-shaped pile is a new type of deformed pile with inverted arcuate surface. Based on the Mindlin stress solution of vertical concentrated force in a semi-infinite body, the X-shaped pile is integrated by eight integration intervals along the circumference of X-shaped pile, The length of the pile is integrated, and a numerical calculation method of vertical additional stress coefficient of X-shaped pile with lateral growth along the pile body, uniform distribution along the pile circumference, rectangular distribution along the pile body and uniform lateral friction along the pile circumference is obtained. The numerical calculation method of vertical additional stress coefficient of uniform resistance of X-shaped pile in foundation is obtained by integrating three integral sections of X-shaped pile section. X-shaped pile lateral friction and end-resistance generated additional stress coefficient with outsourcing square cross-section edge length and arc spacing increases and decreases, with the increase of the number of arc increases. The additional stress coefficient of frictional resistance of X-shaped pile with the same circumference is greater than that of circular pile, the bigger the difference is, the bigger the circumference is. The additional stress coefficient of X-shaped pile end resistance is smaller than that of circular pile, the bigger the difference is.