Abstract: The geological data of Jiaozuo mining area and Zhongmacun colliery has been investigated and sorted out to analyze the sources and conduits of water bursting; the constitutive relation of surrounding rock in water inrush area has been raised according to rock and soil effective stress principle, besides the study has shown that the method of water inrush prevention is to increase the effective stress of surrounding rock and decrease the pore water pressure simultaneously. And the rheological property, flowing law and coverage pattern of grout has been analyzed and researched deeply; then in allusion to the actual conditions of Zhongmacun colliery, a technology of water inrush prevention by pre-grouting in surrounding rock of roadway has been designed and the grouting parameters have been determined. The final project practice has demonstrated the reasonability of the design and has obtained good water plugging effect and successfully met the needs of the mine safety production.

Key words: water inrush, pre-grouting, pore water pressure, parameters of grouting