在矿山井巷、铁路隧道或其他地下工程中,喷射混凝土作为一种新的支护形式,其技术先进及经济合理性已众所周知。但是,当前国内外广泛采用的干法喷射存在的重要问题之一是:回弹率高,粉尘大。粉尘大污染环境有害于施工人员的健康;回弹量高则影响喷射混凝土的经济效 In mine shafts, railway tunnels or other underground projects, shotcrete as a new form of support, its advanced technology and economic rationality are well known. However, one of the important problems existing in the dry jet widely used at home and abroad is that the rebound rate is high and the dust is large. Large dust pollution environment is harmful to the health of construction workers; high rebound impact on the economic efficiency of shotcrete