内蒙地区黄土隧道大变形控制研究

以内蒙地区窑沟黄土隧道为工程依托，通过对施工过程中该隧道围岩变形的监控量测，了解隧道开挖过程中黄土隧道围岩变形的规律:拱部沉降的量值远大于净空收敛的量值，进而明确黄土隧道大变形的控制应以拱部沉降为主。运用有限元分析确定黄土隧道施工过程中控制隧道大变形的途径:初期支护的及时跟进能显著降低黄土隧道围岩的变形；桩处理隧道黄土地基可以有效地降低围岩变形；系统锚杆的施作对围岩变形基本没有影响。

Control Study on Large Deformation of Loess Tunnel in Inner Mongolia

The deformation law of loess tunnel surrounding rock in the process of tunnel excavation is known via the monitoring measurement of deformation of the kiln tunnel surrounding rock during construction. The arch settlement value is far greater than the clearance convergence value, so it is clear that the control of the large deformation of loess tunnel should be based on the arch settlement. The ultimate way to control the large deformation of loess tunnel during the construction process through the finite element:timely follow-up of primary supporting can significantly reduce the deformation of loess tunnel surrounding rock; pile treatment for loess tunnel foundation can effectively reduce the deformation of surrounding rock. The construction of system anchor bar has no impact on the deformation of surrounding rock basically.