竖向荷载作用下斜桩承载特性模型试验研究

通过模型试验研究了竖向荷载作用下砂土中单斜桩的承载特性,分析了斜桩倾角对荷载-沉降特性、桩身轴力、弯矩、剪力及桩侧摩阻力的影响,并与直桩的承载特性进行了比较。试验结果表明:1斜桩沉降大于直桩沉降,斜桩倾角越大,斜桩与直桩沉降差越大。2相同桩顶荷载作用下,斜桩轴力小于直桩轴力,斜桩倾角越大,轴力沿深度衰减得越快。3斜桩弯矩主要发生于1/2桩长范围内,且均随着荷载和倾角的增大而增大;4不论斜桩倾角的大小,桩侧摩阻力沿深度分布均可以分成3个区段,在第1区段,斜桩倾角越大,桩侧摩阻力越小;在第2区段,斜桩倾角越大,桩侧摩阻力越大;在第3区段,斜桩倾角越大,桩侧摩阻力越小。

Model test study on bearing behavior of inclined pile under vertical load

A series of model tests were conducted to study the bearing behavior of vertically loaded single inclined pile embedded in sand. The influence of the pile inclination angle on the load-settlement curve, axial force, bending moment, shear force and skin friction was analyzed. The test results show that the settlement of inclined pile is greater than that of vertical pile, the settlement of the inclined pile increases with the inclined angle; the axial force of inclined pile is less than that of vertical pile under the same pile head load and the reduction rate of axial force along the inclined pile shaft increases with the inclined angle; the bending moment mainly occurs in the upper half of the pile, which increases with the pile head vertical load and inclined angle; the distribution of skin friction can be divided into 3 segments regardless of the inclined angle, in which, the skin friction of the inclined pile reduces with the inclined angle in the first segment, the skin friction of the inclined pile increases with the inclined angle in the second segment, and the skin friction reduces with the inclined angle in the third segment.