论文部分内容阅读
桥梁桩基长期受到恒定和循环载荷的影响,研究其服役期的沉降、承载性能与桩侧摩阻力、循环载荷与土层性质之间的关系,对桥梁的改扩建有重要的意义。采用钢管粘贴光纤光栅(串)的方式设计出了理想模型桩,用于加载试验系统。通过模型试验,对黄土地基中桩基在竖向循环荷载作用下承载特性进行研究,基于桩顶沉降、桩身轴力、桩侧摩阻力及桩周土体应力等数据分析,揭示试验加载次数与桩基承载特性间的关系,拟合了黄土中模型试验桩基在静载作用下桩基的承载力与桩顶沉降关系以及循环荷载作用下的桩顶沉降与循环次数间的变化关系。
The bridge pile foundation is affected by constant and cyclic loads for a long time. Studying the relationship between the settlement, bearing capacity, pile friction, cyclic load and soil properties during its service life, is of great significance to the bridge reconstruction. An ideal model stub was designed by using a steel pipe to stick a fiber grating (string) for loading the test system. Based on the model test, the bearing behavior of pile foundations under vertical cyclic loading in loess foundation is studied. Based on the data analysis of pile top settlement, axial force of pile, friction of pile side and soil stress around pile, the experimental loading times And the relationship between the load-bearing characteristics of pile foundation and the relationship between the bearing capacity of pile foundation under static load and the settlement of pile top and the relationship between the settlement of pile top under cyclic loading and the number of cycles.