近年来,新建铁路隧道锚杆喷混凝土支护技术有了较大的发展,但是,锚喷技术用于整治运营铁路隧道衬砌裂损病害,是从1974年在成昆线正式开始的。几年来,在不断试验和施工实践中得到了进一步的发展和提高。铁道科学研究院长、沙铁道学院等单位都做了模型试验。1974年,昆明铁路局在碧鸡关隧道作了喷射混凝土加固裂损衬砌 In recent years, the new railway tunnel bolt shotcrete support technology has made great development, but the anchor spray technology used to remediate the operation of railway tunnel lining crack damage, is from 1974 in Kunming Line officially began. Over the past few years, continuous testing and construction practices have been further developed and improved. Railway Science Research Institute, Sand Railway Institute and other units have done a model test. In 1974, Kunming Railway Bureau in Bijiguan tunnel made of sprayed concrete reinforcement cracking lining