桩基托换中顶升荷载对新旧结构的影响研究

The Influence of the Jacking Load on the New and Old Structures in the Process of Pile Foundation Underpinning

利用ABAQUS有限元软件对郑州轨道交通5号线的桩基托换项目进行模拟研究,在截桩前对原上部结构进行的预顶升,由于顶升过程对桥台和托换梁以及新桩和旧桩影响方式是不同的,分别分析得出顶升过程对原结构和托换结构的影响特点。

In this paper, the ABAQUS finite element software is used to simulate the pile foundation underpinning project of Zhengzhou rail transit line 5. Before cutting pile, the upper structure need to be jacked, the jacking process has influence on the abutment, underpinning beam, new pile and old pile, and the influencing methods are different. Paper analyzes the influence characteristics of the original structure and the new underpinning structure in the jacking process.