Before excavation, small conduit with holes is driven into the surrounding rock along the periphery of the tunnel and injected into the surrounding rock through the conduit. After the grout hardens, the rock around the tunnel forms a reinforcing circle with a certain thickness. Under the protection of the reinforcement ring, excavation and other operations can be carried out safely. If a simple drill bit is welded at the front end of the small conduit, the drilling and intubation can be completed once, which is called self-propelled grouting anchor bolt. After the slurry is injected into the rock fracture and hardened, it not only cemented the rock block or particles as a whole, but also filled the fracture, blocked the passage of groundwater flowing into the tunnel, and played a role of water blocking.<br>
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