Backfill Mining Technology with Ultra High Water Material in Coal Mine and Outlook
Based on the property of the ultra high water material, the features of the backfill mining technology with the ultra high water material was studied. The technology was including the open type, full package type, mixed type and other mining goaf backfill method. The backfill technical system was composed with material storage and transportation, slurry preparation, slurry transportation, slurry mix- ing, and the backfill technical system was applied to several mines. The application results showed that the ultra high water material had a high water content ( water volume reached at 95% ~ 97% ) , fast setting rate ( initial setting time of 8 ~ 90 min), high early strength, con- solidate incompressible, good loading performances, controllable material strength and setting time and other excellent performances and could be a good backfill material of the mining goal. The backfill technical system would have a low initial investment ( not over RMB 5.0 millions), simple operation, high automatic degree and low pipeline abrasive wear. After the backfill mining conducted, the backfill rate of the mining goaf was over 85% in average, the mine strata pressure behavior degree of the coal mining face was obviously reduced, the failure grade of the surface buildings was within grade 1 failure scope stipulated by the state.
ultra high water materialbackfill miningopen type backfillfull package type backfillmixed type backfill
NETL
NSTL
万方数据
维普
