基于FLAC3D隧道开挖的关键命令流

Command Flow Analysis of Tunnel Excavation Based on FLAC3D

利用FLAC3D软件开展数值模拟分析隧道工程中遇到的问题,以上海软黏土盾构为例,建立隧道开挖的有限差分模型,使用壳单元生成衬砌,锚索单元生成锚杆,用该方法得到的隧道模型与现实隧道更加贴切.运算结果表明:用该隧道模型诱发的地表沉降能用Peck公式进行较好的拟合,基本符合高斯分布,可以有效地模拟隧道开挖引起的地表变形规律.

The numerical simulation of FLAC3 D was used to analyze the tunnel engineering problems. Taking Shanghai soft clay shield as an example,the finite difference model of tunnel excavation was established. The shell element was used to generate the lining,and the cable element was used to generate the anchor rod. The tunnel model obtained by this method is more suitable to the real tunnel. The calculation results show that the ground settlement induced by the tunnel model can be well fitted by the Peck formula,which basically conforms to the Gaussian distribution and can effectively simulate the ground deformation law caused by tunnel excavation.