According to the practical projects, through the proper selection of j et concrete raw materials, gradation design, jet machineries, technologies, taki ng the jet concrete as main support of tunnel, the design goals are obtained.

• 根据隧道合同段的具体实际情况及施工工艺,通过合理选择喷射混凝土的原材料,精确的配合比设计,正确选择喷射机械和工艺流程,严格控制喷射施工质量,使喷射混凝土作为围岩开挖后的主要支护构件,达到设计的作用效果。