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一、前言据粗略统计,在地下工程中应用锚杆和喷射混凝土支护(简称锚喷支护)比一般模浇混凝土衬砌节省水泥和投资一半左右,基本上不用木材,而且还可加快施工速度。但是,过去采用干式喷射混凝土施工(简称干喷法),粉尘多,对操作人员的健康不利;此外,每米~3混凝土的水泥用量也较高,这不仅增加了造价,而且经常导致喷混凝土层(简称喷层)出现龟裂现象,破坏了衬砌的整体性,对水工隧洞的运行很不利。上述问题在某种程度上已影
I. Preface According to rough statistics, application of anchor bolts and shotcrete support (referred to as anchor and shotcrete support) in underground engineering can save cement and investment by about half compared with ordinary mold-poured concrete lining, basically do not use wood, and can also speed up the construction speed . However, the past, the use of dry-jet concrete construction (referred to as dry-jet method), dust and more adverse to the health of operators; In addition, the cement per m3 ~ 3 concrete dosage is higher, which not only increased the cost, and often lead to spray Concrete layer (referred to as spray layer) Cracking phenomenon, undermine the integrity of the lining, the operation of the hydraulic tunnel is very unfavorable. The above problem has been affected to some extent