木寨岭隧道软岩大变形施工技术措施研究

Construction Technology Study on Large Deformation of Soft Rock in Muzhailing Tunnel

通过对兰海高速公路木寨岭隧道3#斜井炭质板岩地段大变形分析研究,归纳得出一些软岩隧道变形特点及规律。施工中采用加大拱架刚度、缩小拱架间距、仰拱增设拱架、双排锁脚锚管、径向注浆、增加预留变形量等措施,控制了变形速率及变形量,达到了预防初支侵限的目的。

By analyzing and researching on the No. 3 inchned shaft large deformation in carbonaceous slate area of the Muzhailing Tunnel in Lanzhou-Haikou Expressway, the deformation characteristics and rules of soft rock tunnels were concluded. In the construction, some measures were taken to control the deformation rate and deformation allowance, such as increasing the stiffness of arch, narrow the arch-frame spacing, adding the arch-frame for inverted arch, using double locking anchor pipe, grouting in radial direction and increasing the reserved deformation allowance. It could achieve the purpose of preventing the primary support from invasion.