以保龙高速公路镇保隧道为实例,该隧道位于怒江支流南亢河与三岔河分水岭部位,属构造剥蚀中等切割中山陡坡地貌区,分水岭呈近东西向,两侧地形较陡,自然坡度30~47度,局部见残留剥夷面,纵向沟谷较发育,水系呈树枝状,较大沟谷中常年流水,植被覆盖良好。当地雨水非常丰富,而且隧道紧靠一原始冲沟,而且是下坡开挖,隧道富水量很大,怎样有效的采用堵漏技术来顺利进行开挖。 Taking the Bao Paul tunnel of BaoLong Expressway as an example, this tunnel is located on the watershed of Nanjikang and Sanchahe which are tributaries of the Nujiang River. It belongs to the structure of eroded and medium-cut Zhongshan steep slope landform. The watershed is nearly east-west with steep topography on both sides, 30 ~ 47 degrees, the local see remnant peeling surface, the longitudinal valleys more developed, the water was dendritic, perennial flow of larger valleys, vegetation cover well. The local rainfall is very rich, and the tunnel is close to a primitive gully, and it is downhill excavation. The tunnel is rich in water and how to effectively use plugging technology to excavate well.