随着“新奥法”在铁路隧道工程的推广应用,隧道的开挖方法也逐步由小断面分步开挖发展到大断面一次或两次爆破成型。全断面开挖有利于实现光面爆破,减少对围岩的扰动,充分发挥围岩的自稳能力,便于及时喷锚支护形成封闭环,防止坍塌,保证施 With the popularization and application of “New Austrian Law ” in the railway tunnel project, the excavation method of the tunnel gradually develops from small section to large section blasting once or twice. Full-face excavation is conducive to the realization of smooth blasting, reducing the disturbance to the surrounding rock and give full play to the self-stability of the surrounding rock to facilitate the timely formation of a closed ring spray anchor support to prevent collapse