复杂地质条件下桥梁桩基竖向承载力研究  

Research on Vertical Bearing Capacity of Bridge Pile Foundation under Complex Geological Condition

作　　者：刘彦玲 LIU Yanling(Sichuan Chenzhongchen Construction Engineering Co.,Ltd.,Chengdu 610081,Sichuan,China)

机构地区：[1]四川省辰中辰建设工程有限公司,四川成都610081

出　　处：《工程技术研究》2024年第15期11-13,共3页Engineering and Technological Research

摘　　要：探究复杂地质条件下桥梁桩基的竖向承载力特性对保障桥梁的安全性和稳定性而言至关重要。文章依托某桥梁桩基施工工程,对该工程中的桩基进行加载试验,分析了加载及卸载过程中试桩的荷载-位移曲线;采用数值模拟方法建立三维桩基分析模型,在模拟数据与试验数据基本吻合的基础上,分析了加载过程中的桩身轴力、桩侧摩阻力及桩体沉降规律。结果表明,试桩的极限承载力为38629 kN,满足设计要求,终止加载后,试桩向上位移最大值为10.76 mm,向下位移最大值为7.07 mm;随着桩身深度的增大,桩身轴力逐渐减小且减小幅度增大;在不同分级荷载下,桩侧摩阻力最大值均出现在桩身深度35 m位置。It is very important to explore the vertical bearing capacity characteristics of bridge pile foundation under complex geological conditions to ensure the safety and stability of the bridge.Based on a bridge pile foundation construction project,the loading test is conducted on the pile foundation in the project,the load-displacement curve of the test pile during loading and unloading is analyzed,the three-dimensional pile foundation analysis model is established by numerical simulation method,and the pile axial force,pile side friction and pile settlement law in the loading process are analyzed on the basis of the basic agreement between the simulation data and the test data.The results show that the ultimate bearing capacity of the test pile is 38629 kN,which meets the design requirements,after the loading is terminated,the maximum upward displacement of the test pile is 10.76 mm,and the maximum downward displacement is 7.07 mm;with the increase of the pile depth,the axial force of the pile decreases gradually and the decrease amplitude increases;under different graded loads,the maximum value of pile side friction appears at the depth of 35 m.

关 键 词：复杂地质 桥梁桩基 竖向承载力 数值模拟 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]