Simulation of Water Infusion in Deep Strip Working Face by High- pressure Gradual Splitting and Its Application in Stress Relief

Tangkou Coal Mine of Zibo Mining Group is near to Jining city and the coal mining is influenced by villages seriously.For ensuring the normal production of the mine,90 m-long strip working face is generally adopted.Since Tangkou Mine is a mine with the mining depth over 1 000 m,the coal seams are prone to burst and have low porosity and large ground stress,water infusion in coal seams may be adopted to achieve the goal of stress relief.A mathematical model of coal seam water infusion was established on the basis of fluid-solid coupling equation of coal and the continuous equation of fluid in porious medium.Based on the establishment of the geometrical model for numerical simulation of coal seam water infusion,numerical simulation was carried out on the seepage pressure field,velocity field and moisture increasement of coal seam under the conditions of 70 m one-way hole as well as 3.5 MPa and 21.0 MPa water pressures according to the actual conditions of Jibei Coal field and by using ANSYS softwere.Finally,seam water infusion technology by high-pressure gradual splitting for 5301 working face of Tangkou Mine was designed,and better stress relief effect was achieved.