In a fractured carbonate filled with water-bearing rock, the overburden cover is thick than 100m above the tunnel with the serious rock mass weathering and strong permeability of rock. In the excavation of the cave, broken hole or fault fracture zone, there is greater vein-like gushing in the working face. After simply blocking, the daily inflow is around 2000³. It makes the drilling work different and causes the problem of clamp drill and hole collapse occurs.
For such a special formation, it is suggested to use Sinorock® self drilling rock anchor(pernos autoperforantes
) that can set drilling, grouting and anchoring simultaneously and avoid two potential disadvantages: The first is hard to make a drill and easy for hole collapse; the second is the grout leaking during grouting due to the pressure of water gushing and rock crusher. And then it can effectively control the surrounding rocks of deforming, displacing and cracking, keep the integrity and stability of surrounding rocks， make a construction and achieve the purpose of the consolidation of the rock.