地下开采有用矿物矿床和建筑地下构筑物都必须掘进大量水平巷道,其比重约占矿山巷道总掘进量的40％。巷道支护是劳动量最大和材料消耗最多的工序,到巷道交付使用时支护费用占总费用的35～40％。因此,矿井建设者对愈益广泛采用的喷射混凝土轻型支护的兴趣是有根 Underground mining useful mineral deposits and underground structures must dig a large number of horizontal roadway, the proportion of the total roadway accounted for about 40% of the total amount of tunneling. Roadway support is the largest labor and material consumption of the most processes, to the tunnel when the use of support costs accounted for 35 to 40% of the total cost. As a result, miners have an interest in the increasingly widespread use of shotcrete lightweight support