浅埋偏压大断面隧道掘进工艺的改进及应用

在浅埋偏压特大断面隧道施工进洞过程中,对双侧壁导坑法进行优化改进,利用临时斜撑,对拉锚杆加固核心土。结合隧道施工监控量测,视围岩的变形稳定情况,确定开挖进尺,适时拆除临时支撑。随着该隧道施工进洞安全有序推进,改进后的双侧壁导坑法在龙头山特大断面隧道施工进洞过程中得到成功实践应用。

Improvement and Application of Excavation Process of Large Section Tunnel with Unsymetrical Pressure and Shallow Bury

During the execavation process of the shallow-buride tunnel with unsymmetrical pressure and large section, the both side drift method is optimized, the temporary supporting is used and the rock bolt is used to reinforce core soil. Combination with thegeological prediction, deformation and stability of surrounding rock we can determine the excavation footage, the timely removal of temporary support. With the tunnel construction in safety and orderly propulsion, the both side drift method with improvement had been successfully applicated in the execavation of Longtoushan tunnel entrance with large section.