Application of steel fibre shotcrete in permanent support of water diversion tunnel

Steel fibre shotcrete is widely used in tunnel works in many countries.For example,in Switzerland,Norway,Belgium,Germany,Canada,South Africa,France,U.S.A,Finland,Japan etc.,the design and construction standards have been drawn up,and steel fibre concrete is used for initial-stage support and permanent support in large amount.This paper briefly introduces mix ratio test of steel fibre concrete before support process and main points of quality control in support process,especially construction technology control,and carries out technologic and economic analysis for permanent support in underground chamber by steel fibre shotcrete.The practice in this project will promote further application of steel fibre concrete.