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采用复合式衬砌的隧道及地下工程 ,锚喷支护系统的耐久性直接影响结构的稳定性和运营年限。锚杆主体属于钢构件 ,极易遭受侵蚀。从采用复合式衬砌的隧道及地下工程的结构特点可知 ,对于一定形式的锚杆 ,所遭受的侵蚀作用主要取决于锚杆与来自围岩的侵蚀性地下水的相互作用。本文探讨了含硫化物围岩中影响锚杆侵蚀的主要因素 ,描述了侵蚀性地下水的形成 ,以及锚杆侵蚀作用的物理化学机理 ,并提出了基于此机理的含硫化物围岩中锚杆使用年限的估算方法
The use of composite lining of the tunnel and underground engineering, anchor spray support system durability directly affect the stability of the structure and operating life. Anchor body belongs to the steel components, vulnerable to erosion. From the structural characteristics of tunnels and underground works using composite linings, it can be seen that the erosion suffered by a certain type of anchor rod mainly depends on the interaction between the anchor rod and the aggressive groundwater from the surrounding rock. In this paper, the main factors influencing the erosion of rock bolts in sulphide-bearing surrounding rock are discussed, the formation of aggressive groundwater and the physical and chemical mechanism of rock erosion are described, and the mechanism of rock bolt Estimated useful life method