基于ABAQUS部件装配和单元追踪的盾构隧道施工数值仿真对比研究

Comparative Study on Numerical Simulation of Shield Tunnel Construction Using ABAQUS Component Assembly and Element Tracking Methods

当采用通用有限元软件ABAQUS模拟盾构隧道施工时,部件装配法应用广泛,但其在处理盾壳、注浆体、土体及管片等多部件间复杂接触关系时,常面临计算收敛性不佳的挑战;而单元追踪法通过共节点单元复制有效规避了这一难点。构建了荷载-结构模型,对比验证部件装配法与单元追踪法的收敛性,计算显示在相同的网格密度下,单元追踪法在收敛性方面展现出了显著的优势。以双线盾构隧道下穿路基施工为依托,深入对比分析了部件装配法与单元追踪法模拟盾构施工时,计算所得的土体变形、路面沉降、管片内力及计算效率的差异。研究结果表明,两种方法在土体变形、路面沉降、管片内力计算上的差值在5%以内,且单元追踪法可缩短14%的计算时间。鉴于此,在运用ABAQUS模拟盾构隧道施工且研究重点不聚焦部件间详细接触关系时,推荐单元追踪法作为首选方法。

When using the general finite element software ABAQUS to simulate shield tunnel construction,the component assembly method is widely applied.However,this method often faces challenges related to computational convergence when handling complex contact relationships among multiple components,such as the shield shell,grouting material,soil,and segments.In contrast,the element tracking method effectively addresses this issue by replicating shared-node elements.This paper first constructs a load-structure model to compare and verify the convergence performance of the component assembly and the element tracking method.Calculations indicate that,under the same mesh density,the element tracking method exhibits a significant advantage in convergence.Using the example of a double-track shield tunnel undercrossing a road,this study then conducts an in-depth comparative of the two methods regarding soil deformation,road settlement,segment internal forces,and computational efficiency.The results indicate that the discrepancies between the two methods in calculating soil deformation,road settlement,and segment internal forces are within 5%,and the element tracking method reduces computation time by 14%.Consequently,when using ABAQUS to simulate shield tunnel construction without a primary focus on detailed contact relationships between components,the element tracking method is recommended as the preferred approach.