地铁盾构分岔式隧道数值模拟及应用

Numerical simulation and application on forked tunnel of metro shield

为研究地铁盾构分岔隧道问题,采用FLAC3D三维模拟技术以原始隧道经过简化得到计算分析三维模型,分析了不同分岔角度下的应力、变形问题.研究结果表明:分岔隧道的应力、变形随分岔隧道夹角的增大而减小,应力叠加越来越小,当分叉角度较大时,应力集中峰值开始分岔变为两个峰值;通过与现场监测结果对比,现场监测值与数值模拟结果吻合.

In order to study the problem of shielded subway forked tunnel,the original tunnel was simplified for the 3D model to analyze the stress and deformation of different bifurcation angle by using the FLAC3D 3D simulation technology.The research results show that the stress and deformation of different forked tunnels are reduced with the bifurcation angle increasing,and the stress superposition is getting smaller and smaller.When the bifurcation angle is large enough,the peak of stress concentration begins to branch into two peaks.By comparing with the field monitoring results,the field monitoring values are agreed with the numerical simulation results.