Application technology of ultra high-water material in coal mine

Based on the basic characteristics of ultra high-water materials, such as early strength, strength adjustable and re-cementing, in view of the practical pro blems encountered in the process of coal mining, the development of ultra-high water slurry process, super high water material flldl with hydraulic support. The applica tion of ultra-high water materials in the new technology fields such as coal mining, gob-side entry retaining, ground pit grouting reinforcement, goaf fire prevention and C ontrol technology, and"two-step-method' grouting transfortion. The results showed that the activity of the overburden strata in the goaf was smooth and the apparent pre ssure was not obvious in the mined-out area, and the flling effect was better. The ultra-high water material was used for the fire-not only play the role of isolation of the air, but also to prevent the evaporation of harmful gases, reducing the concentration of toxic and harmful substances in the air, reducing the amount of materials, reduci ng the flling costs. The application technology of ultra-high water material as a new type of mine flling material in coal mine had been basically mature.