竖向荷载作用下桥梁工程桩基承载性能试验研究

Experimental Study on Bearing Capacity of Pile Foundation of Bridge Engineering Under Vertical Load

文中以贵州省某桥梁工程为依托,对桥梁桩基的竖向受力、桩侧摩阻强度以及桩基土压力随着桩身的变化规律进行研究。结果表明,小荷载水平下,随着桩基深度的增加,桩基竖向受力表现为先稳定后快速降低的变化规律且内外侧曲线基本一致;大荷载水平下,随着桩基深度的增加,桩基竖向受力表现为持续降低的变化规律。所有荷载水平下,随着桩基深度的增加,桩基桩侧摩阻强度表现为先增加后降低的变化规律,曲线存在显著的反弯点。随着桥梁施工进度的不断推进,桩基内侧的土压力水平不断降低,且桩基外侧的土压力水平高于桩基内侧的土压力水平。

In order to analyze the bearing characteristics of bridge piles under vertical loads,this paper,based on a bridge project in Guizhou Province,studies the vertical force of bridge pile foundation,pile side friction strength and pile soil pressure changes with the pile body.The results show that with the increase of pile depth under low load,the vertical force of pile foundation is stable at first and then decreases rapidly,and the internal and external curves are basically the same.With the increase of pile foundation depth,the vertical force of pile foundation shows a continuous decrease under large load level.Under all load levels,with the increase of pile depth,the side friction strength of pile foundation increases first and then decreases,and there is a significant reverse bending point in the curve.With the progress of bridge construction,the soil pressure inside pile foundation decreases continuously.The soil pressure on the outside of pile foundation is higher than that on the inside of pile foundation.