喷混凝土结构是当前地下工程中一项新的支护结构型式。它与传统的模注混凝土比较,因支护结构能与围岩有较好的粘合,支护及时,因而在防止岩体的松弛和岩块的坍落,改变围岩的二次应力场,增强坑道围岩的稳定性方面都有较显著效果。因此近年来在我国日益广泛地在各种地下建筑中大量地、有成效地采 Sprayed concrete structure is a new type of support structure in underground engineering. Compared with the traditional injection molding of concrete, because the support structure can be better with the surrounding rock bonding, support timely, and thus prevent the relaxation of rock mass and rock slump, changing the secondary stress field of the surrounding rock , To enhance the stability of tunnel surrounding rock have more significant effect. In recent years, therefore, it has been increasingly extensively and effectively exploited in various underground structures in our country