小间距隧道施工动态监测与数值模拟分析

主要对小间距隧道在洞口偏压和两个洞口有错台的情况下进行施工动态监测和平面数值模拟分析.以云南省平年隧道为例,通过分析现场监测数据,得出现场量测的洞口地表沉降值对预测洞口塌方有重要的作用的结论.应用施工动态反馈的原理对选定断面的洞周收敛和地表沉降量测值进行分析,得到了正常施工情况下的拟合函数,可为后续步骤的施工提供参考价值.再通过二维情况下的数值模拟分析,与实测结果进行对比,反映了一些规律性问题,重点研究了两个隧道中夹岩体的稳定性.

Dynamic Monitoring and Numerical Simulation Analysis of Closely-spaced Tunnel

The paper focuses on the dynamic monitoring and numerical simulation analysis of closely - spaced tunnel. This is a special type of tunnel because the altitude of two tunnels is different which is called altitude difference. In addition, the opening of tunnel is partially pressed. This paper gives an example of Pingnian tunnel in Yunnan province. It can be concluded that the settlement of ground surface in opening is very important to forecast land - slip. With the principle of in - time back analysis, the tunnel periphery convergence and settlement of ground surface is also analyzed, and we get the nonlinear curves, which is helpful to following construction steps, besides, the same behavior is simulated in two - dimension with numerical method. After the comparison of the results between the numerical calculation and measurement, some regular conclusions are got. In addition, research on the stability of the intermediate surrounding rock is emphasized.