桥梁桩基础变形监测研究

Study on Deformation Monitoring of Bridge Pile Foundation

为提升桥梁桩基础施工质量,文中以某特大桥梁工程为例,对施工过程中桥梁桩基础沉降量、桩身轴力以及压缩变形变化规律进行分析。结果表明,梁施工与初始承台浇筑施工相比,桩基顶部桩身轴力增加了146倍,最大桩身轴力增加了21倍,桩底轴力增加了63倍。随着桩身深度的增加,桥梁桩底压缩层沉降量表现为先快速增加后趋于稳定的变化规律;梁施工时,与承台浇筑相比,桩底压缩层沉降量增加了1.3倍。随着桩身深度的增加,桥梁桩底压缩层沉降量表现为先快速增加后趋于稳定的变化规律,梁施工与承台浇筑相比,桩底压缩层沉降量增加了1.3倍。随着桥梁工程施工进程的不断推进,桩基础的桩身轴力,桩基础的桩身压缩量、总沉降量以及桩基底部压缩层沉降量不断增加。

In order to improve the construction quality of bridge pile foundation,this paper takes a large bridge project as an example to analyze the variation law of bridge pile foundation settlement,pile axial force and compression deformation during construction.The results show that the axial force at the top of pile foundation increases 146 times,the maximum axial force increases 21 times and the bottom axial force increases 63 times compared with the initial cap pouring construction.With the increase of pile depth,the settlement of compressed layer at the bottom of bridge pile increases rapidly at first and then tends to be stable.During beam construction,the settlement of compressed layer at pile bottom increases by 1.3 times compared with the pouring of cap.With the increase of pile depth,the settlement of compressed layer at the bottom of bridge pile increases rapidly at first and then tends to be stable.Compared with beam construction and cap pouring,the settlement of com-pressed layer at the bottom of pile increases by 1.3 times.With the continuous progress of bridge construction,the axial force of pile founda-tion,the compression of pile foundation,the total settlement and the settlement of compressed layer at the bottom of pile foundation increase continuously.