Design of Water Injection Technique for High Ground Pressure Low Cracking Rate Seam Pressure

In order to solve the water injection difficult problem in the high ground pressure and low porosity seam, the paper analyzed the seam water injection an d coal wetting process and had a study and design on the water injection technique for the high ground pressure and low porosity seam with the permeation agent and t he high pressure pre-fracturing wave water injection.A site application of the water injection technique was conducted in E3101 East coal mining face of Xingcun Mine.T he permeation agent and the water injection technique parameters was individually optimized suitable for the coal mining face.The results showed that after the applicat ion to E3101 East coal mining face, the water injected to each borehole in average would be over 53 m3.The dust control rates of the total dust and respirable dust wou Id be 32.9% and 3.8% individually.Although the mine pressure bumping frequently occurred, the energy released from each bumping would be below 105 J in average.T here was no mine pressure bumping accident occurred during the mining process.The temperatures of the coal mining face, air return corner and air return flow were in dividually reduced by 1.075。C, 0.525。C and 0.475。C individually in average.With above measures made, the water injected quantity in seam of E3101 East coal mining face was obviously improved.A good dust control, mine pressure bumping prevention and control and temperature reduction effect was obtained.