隧道围岩施工监测及位移动态模拟分析

为了研究不同支护结构参数和不同开挖方法对围岩位移的影响，以百勺洋隧道为研究对象，通过现场实测、回归分析和数值模拟的技术手段，以大型非线性有限元软件ADINA为研究工具，建立有限元模型。通过改变锚杆支护相关参数和开挖方法，进行大量模拟运算。运算结果表明，随着锚杆长度的增加，地表点下沉量不断减小，隧道的底鼓幅度也逐渐减小，边墙的收敛量也逐渐减小；随着锚杆间距的增加，顶端最大下沉点的竖直方向沉降值增大，边墙收敛值也增大；开挖方法不同时，随着开挖步数的减少，地表下沉值增加，隧道底鼓现象也越明显。开挖步数越多，洞周收敛值越小。

Monitoring and Dynamic Simulating of Surrounding Displacements in Tunnel Construction

In order to research the influence of different support parameters and excavation method on the surrounding rock displacement, Bai Shao Yang tunnel is taken as object for the study, through the measure on site, regression analysis and numerical simulation technological methods. A large number of simulation calculation is done by changing the relative support parameters and excavation method of anchor rod. The results showed that with the increase of the length of the anchor rod,the settlement value at the top of rock continue to reduce; the amount of arch＇s bottom gradually reduces ; the amount of convergence of the sidewall gradually reduces ; the larger of the anchor rod spacing becomes, the larger of the value of the settlement in the vertical direction at the largest settlement point of the top will be, with the larger convergence value of the sidewall. Using different methods of the excavation of the tunnel, with the reduce of the number of excavation step, the settlement value of the surface continue to increase, with the phenomenon of arch＇s bottom gradually clear. The more of the excavation＇ s step is, the smaller of the convergence＇ value of the sidewall will be.