高港枢纽二线船闸地连墙板桩结构整体数值模拟

Finite element model of sheet-pile structures with underground retaining walls in Gaogang second-line shiplock project and its numerical verification

针对建设中的泰州引江河高港枢纽二线船闸工程,基于ABAQUS平台建立了船闸地连墙板桩结构整体分析的有限元模型,预测锚碇桩、地连墙的变形性态以及拉杆在施工期不同阶段的内力状态。利用ABAQUS的用户子程序功能开发了相应的邓肯-张材料本构模型模拟土体填筑和开挖过程中的应力-应变特性,采用指数型的接触本构关系模拟地连墙与土体之间的相互作用。有限元分析计算结果与现场实测结果对比表明,所建立的整体分析模型能够准确地预测施工期不同阶段锚碇桩、地连墙的变位情况以及拉杆的内力情况。

With a focus on the Gaogang second-line shiplock, under construction on the Yinjiang River in Taizhou City, as a study object, a finite element model of sheet-pile structures with underground retaining walls was established based on the ABAQUS platform. The model can be used to predict the deformation behavior of an anchor pile and underground retaining wall and the internal force state of the bar in different stages of the construction period. Based on ABAQUS user subroutines, the Duncan-Chang constitutive model was developed to simulate the stress-strain characteristics of soil in the process of soil filling and excavation. The exponential contact constitutive model was used to simulate the interaction between the underground retaining wall and the soil. Results from the finite element analysis were compared with the measured data. The results show that the established finite element model of sheet-pile structures with underground retaining walls can accurately predict the deformation of the anchor pile and underground retaining wall and the internal force of the bar in different stages of the construction period.