地下结构物使用喷射混凝土作为临时支护或永久衬砌,已经有几十年的历史。在用喷射混凝土加固和改建旧隧道衬砌方面,也有不少成功的先例,采用这种新型的衬砌结构可以提高工效,降低成本,节约材料、设备和劳力。目前在国内外矿山,水利、建工 Underground structures have been used for decades as a temporary support or permanent lining with shotcrete. There are also many successful precedents in using shotcrete to reinforce and rehabilitate old tunnel linings. Using this new lining structure can improve work efficiency, reduce costs and save on materials, equipment and labor. Currently at home and abroad mines, water conservancy, construction