Advanced grouting reinforcement technology for fully mechanized caving face passing through fault under complex geological conditions

Taking the water-conducting fault DF₂₉ at the coalface 401101 of Mengcun Coal Mine in Binchang Mining Area as an example, the water-richness of the large fault DF₂₉ was identified by means of roadway disclosure, hydrogeological exploration and water sample analysis. In view of the characteristics of the large fault DF₂₉, this article proposed that it was prone to sudden water, impact pressure, roof fall and other disasters during the process of passing through the fault DF₂₉. In addition, a new method for grouting water-conducting water in fully mechanized caving face is proposed to improve the bearing capacity of coal-rock mass in fault perturbation zone, that is, to adopt the governance idea of “advanced pre-grouting of double gateways treatment and coalface local grouting treatment”. Two products were developed, one is a kind of cement-based grouting reinforcement material（SCJG-1） with strong injectability, good fluidity and good bonding, the other is a kind of mine composite grouting reinforcement material（SCPJG-2）with low reaction temperature and high strength. Engineering practice shows that adopting the grouting method and the special material, the fully mechanized caving face 401101 successfully passed through the water-conducting fault DF₂₉, which ensures the safe mining of the coalface.