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燕尾段位于线路由单线绕行变为双线并行或由双线并行变为单线绕行的过渡地段,中导洞开挖采用台阶法开挖。Ⅰ线开挖采用上、中、下台阶开挖,为减少对中隔墙的震动和飞石的直接撞击,为控制飞石的方向,调整最小抵抗线方向,开挖时,前中隔墙一侧挂设薄保护层,对中隔墙墙面采用挂草帘、竹条板和钢板防护。
The dovetail section is located at the transitional section where the route is changed from single-line winding to double-line parallel or from double-line parallel to single-line bypass. The middle-lead tunnel is excavated by the step method. Ⅰ line excavation using the upper, middle and lower steps of excavation, in order to reduce the vibration of the wall and the direct impact of flying stone, in order to control the direction of flying stone, adjust the minimum resistance line direction, excavation, the front wall One side of the hanging thin protective layer, the walls of the wall hanging straw curtain, bamboo and steel plate protection.