竖向载荷下桥梁桩基承载特性研究  

Research on Bearing Characteristics of Bridge Pile Foundation Under Vertical Load

作　　者：王道亮 Wang Daoiang(Sichuan Railway Construction Co.Ltd.,Chengdu,Sichuan 610000)

机构地区：[1]四川省铁路建设有限公司,四川成都610000

出　　处：《江西建材》2024年第6期306-308,共3页

摘　　要：为分析竖向荷载作用下桥梁桩基础的承载特性,文中以某桥梁工程为例,通过静载试验分析了单桩及群桩的荷载-位移曲线、单桩桩身轴力以及桩侧摩阻力随桩深的变化规律。结果表明,随着桩身深度的增加,桩身侧摩阻力呈现先增加后降低的趋势,曲线存在反弯点,发生在桩深为30cm的位置;随着加载水平的增加,桩身侧摩阻力不断增加。桩的数量越多,桩基的沉降量越小,承载力越好。九桩的最大桩顶沉降量为20mm,卸载后的恢复沉降量为8.5mm;六桩的最大桩顶沉降量为25mm,卸载后的恢复沉降量为12.1mm;四桩的最大桩顶沉降量为28mm,卸载后的恢复沉降量为18.5mm。In order to analyze the bearing characteristics of bridge pile foundation under vertical load,the load-displacement curve of single pile and pile group,the axial force of single pile and the lateral friction resistance of pile with pile depth were analyzed through static load test of a bridge project.The results show that with the increase of pile depth,the lateral friction resistance of pile body increases first and then de-creases.There is a reverse bending point in the curve,which occurs at the pile depth of 30 cm.With the increase of loading level,the lateral friction of pile body increases continuously.The greater the number of piles,the smaller the settlement of pile foundation and the better the bearing capacity.The maximum tip settlement of the nine piles is 20 mm,and the recovery settlement after unloading is 8.5 mm.The maxi-mum tip settlement of the six piles is 25 mm,and the recovery settlement after unloading is 12.1 mm.The maximum pile top settlement of the four piles is 28mm,and the recovery settlement after unloading is 18.5 mm.

关 键 词：桥梁工程 桩基础 承载特性 桩身轴力 桩侧摩阻力 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]