摘要
以郑徐(郑州—徐州)高速铁路一特大桥桩侧堆载为背景,采用ABAQUS建立桩-土相互作用有限元模型,研究在不同堆载等级和堆载距离下桩侧摩阻力和桩身轴力的分布规律以及桩顶沉降规律。结果表明:桩侧负摩阻力主要分布在0.57倍桩长范围内,堆载等级越大桩侧摩阻力和桩身轴力越大,负摩阻力最大值出现在0.29倍桩长处,轴力最大值出现在0.52倍桩长处;堆载距离越大桩侧摩阻力和桩身轴力越小,堆载距离大于5倍桩径时,桩侧摩阻力和桩身轴力均明显减小;堆载等级越大堆载对桩基的竖向位移影响越大,堆载距离越大堆载对桩基的竖向位移影响越小。计算结果可以为桩侧堆载控制提供理论依据。
The lateral stack load nearby the pile of the D4 large bridge of the Zhengxu high speed railway line was studied in this paper.The finite element model of pile-soil interaction was established using.The distribution of skin friction and axial force,a nd the settlement of pile top were studied respectively, considering different stack load levels and distances.The results indicate that the negative skin friction is mainly distributed within the range of 0. 57 pile length away from the pile top. The larger surcharge level,the greater negative skin friction and axial force. The maximum negative skin friction appears at 0. 29 pile length and the maximum force occurs at 0. 52 pile length.The greater stack load distance,the smaller skin friction and axial force.When the stack load distance is greater than 5 times of the pile diameter, skin friction and axial force are significantly reduced.Higher level of the stack load leads to more significant effect on vertical displacement of the pile while larger stack load distance results in less influence on the vertical displacement.The calculation results are supportive for the controlling of lateral stack load nearby the pile.
作者
王军
马学宁
WANG Jun;MA Xuening(College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)
出处
《铁道建筑》
北大核心
2018年第9期72-75,共4页
Railway Engineering
基金
国家自然科学基金(41562014)
关键词
铁路桥梁
侧向堆载
数值计算
单桩基础
负摩阻力
桩顶变形
Railway bridge
Lateral stack load
Numerical calculation
Single pile foundation
Negative skin friction
Pile top deformation
