The Cangfeng tunnel on Qingshan Plant Road has a total length of 251.6m.
Cement grout was applied as consolidation grouting. By drilling, fixed grouting tubes and tight seals,injecting cement grout or cement sand grout, and so on, injecting grout in steps into the rock plate, the strength of the rock plate and leakage were improved. The integrity, material,compression and so on, of the rock plate were improved.