The seepage effect problem caused by the deep mining engineering has come into focus following the damage and collapse of water inflow during the mining production, principally due to the formation pressure and high hydrostatic pressure. Although treated by interception and grouting with Portland cement slurry, air shaft water inflow of Tangkou Mining (1044m, Jining, China) still reached about 170 m~3/h because of the seepage effect. If the water inflow was not managed effectively and efficiently, it would cause great economic losses and casualties. A method of grouting and anchoring for water plugging was presented in this paper. Considering the size of rock fissures was very fine, ultra-fine cement was taken as grouting material. Thus, experimental investigations of ultra-fine cement viscosity were performed. It is found that water-cement ratio 1:1 and Naphthalene based superplasticizer 1.5% are optimum to viscosity of ultra-fine cement. As a result, water inflow was successfully controlled by the method of grouting and anchoring with ultra-fine cement slurry. The drainage fee $434,286 could be saved per year.
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