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目前,井下喷射混凝土支护一般可分为素喷混凝土、喷锚及喷锚网联合三类,根据配筋品种的不同,还可分为锚杆、钢筋网混凝土支护及纤维混凝土支护两种。应该指出,尽管喷锚网联合支护的出现,能部分的改善混凝土材料的工作性能,但是仍不能从根本上克服混凝土的致命缺陷——脆性破坏。依照材料力学的观点,根据不少矿山的具体情况来看,笔者认为克服这一缺陷的关键和研究的主攻方向仍在于提高混凝土材料本身的抗拉及抗弯能力,其研究内容主要包括以下两个方面。
At present, the grouting support of shotcrete in underground can be generally divided into three types, that is, sprayed concrete, sprayed shotcrete and shotcrete and bolting wire mesh. According to the different varieties of reinforcement, it can be further divided into two types: anchor bolt, steel mesh concrete support and fiber concrete support two Species. It should be pointed out that although the combined support of shotcreting and anchor net can partially improve the workability of concrete materials, it still can not fundamentally overcome the fatal flaw of concrete - brittle failure. According to the mechanics of materials, according to the specific conditions of many mines, I believe that the key to overcome this defect and the main direction of the study is still to improve the tensile strength and flexural capacity of concrete itself, the main contents of the study include the following two Aspects.