一、喷混凝土衬砌的作用 在隧道施工中,使用喷混凝土内衬与灌筑混凝土衬砌的目的基本相同,即使隧道拱圈围岩稳定,但两者在结构处理的观点上则有所不同。灌筑混凝土衬砌中,开挖后的松动围岩借助内衬的反压达到稳固;喷混凝土是在早期将围岩裂隙节理填实封闭,从而减小围岩的松 First, the role of sprayed concrete lining In the tunnel construction, the use of sprayed concrete lining and filling of concrete lining the same purpose, even if the tunnel arch ring surrounding rock stability, but both in terms of structural treatment is different. In the filled concrete lining, the loose surrounding rock after excavation is stabilized by the back pressure of the liner; sprayed concrete is used to seal and fill the fractured joints of the surrounding rock in the early stage so as to reduce the looseness of the surrounding rock