偏压高铁隧道施工监测与有限元仿真

Site-measurement and FEM Simulation of High-speed Rail Tunnel with Unsymmetrical Loading

利用现场量测和有限元仿真的方法研究了偏压高铁隧道施工后的位移应力变化。现场实测中,在每个断面布置7个测点,测量断面间距为10m,获得了第一手的现场实测数据,在隧道施工过程中提供实时的监控依据。利用专业网格划分软件Hyper Mesh和大型通用有限元软件ABAQUS建立了偏压地形-隧道衬砌的高仿真有限元模型,对隧道开挖后的应力场和位移场进行了模拟,模拟结果显示,偏压隧道呈现位移场和应力场不对称分布的特点,总的来说,埋深较大的位置沉降大。有限元模拟结果与实测的结果吻合,能很好地为实际施工给出指导作用。

Displacement and stress field of a high- speed rail tunnel with symmetrical loading were researched using site measurement and finite element method（FEM） simulation. Seven measurement points were set on every section and the distance between each two measurement section was 10 meters.Displacement monitoring supplied one-hand data to the construction process. A vivid FEM model were built and calculated via the Software of Hyper Mesh and ABAQUS, which contains lining of tunnel and terrain close to real geography. The result shows a symmetrical distribution of field of both stress and displacement exists because of the symmetrical loading, and generally speaking, a large depth of tunnel leads to a large settlement. The FEM result is coincide to the result of site survey.