盾构法地铁施工地表变形分析及数值模拟

Analysis of ground surface deformation due to shield tunneling and 3D-FE simulation

文章全面分析了在不排水条件下软土地层中采用盾构法施工引起地面沉降的因素,并运用通用有限元程序ANSYS,综合考虑这些因素建立力学模型。以天津地铁一号线扩建工程为背景,对盾构的推进过程进行了三维非线性有限元仿真模拟。通过研究得出了地表土体的变形规律,其计算结果与实测值比较吻合。

The study is based on the available documents of Line 1 of Tianjing Metro project. A comprehensive analysis on the factors related to undrained ground movements induced by shield tunneling in soft stratum was carried out and a 3D nonlinear constitutive model taking into account these factors was formulated. Software ANSYS was a- dopted to simulate the advance of a tunneling shield incorporating nonlinear finite element analyses. The results of numerical analyses are found consistent with the in -situ measured soil displacements.