Tunnel Entry Method for Slopes Covered with Gravel and Pebble Layers
TakingShigu Water Source Project of Dianzhong Water Diversion Project as an example,this paper discusses the tunnel entry method for slopes covered with sand and gravel.The stability of the slope covered by gravel and gravel is poor,and the safety risk of excavation at the tunnel entrance is relatively high.This article proposes construction control measures for the excavation of tunnels on slopes covered with gravel and gravel.Steel pipe grouting piles and self advancing advance grouting large pipe sheds are installed on both sides of the slope at the hole mouth.The excavation method of reserving core soil and dividing steps is adopted for the tunnel entry.It can effectively reduce the safety risks of tunnel excavation,improve the construction progress of tunnel entry,and meet quality requirements.
sand and gravel covering layerexcavation of tunnel entranceconstruction quality control