Study on Technical Parameter Optimization and Mine Strata Pressure Law of Wongawilli Mining face in Daliuta Mine

In order to ensure the imported Wongawilli continuous mining technology with a safety and high efficient production effect in Shendong Mining Area and to improve the coal mining recovery rate,an optimization was conducted on the technical parameters of the Wongawilli mining at different section of the coal mining face in Daliuta Mine and a study was conducted on the monitoring and measuring of the mine strata pressure law.The comparison and analysis on the monitoring and measuring data of the mine strata pressure showed that the protective coal pillar with 10m wide for the gateway could ensure the safety of the isolation,the coal pillars each with 0.5m thick top coal between the cuttings could assist the coal cutting and coal loading effects of the continues miner and could not play the strata support role.The coal pillars each with 2.0m thickness along the gateway sides could play the roof support role.In comparison with before the optimization of the Wongawilli mining,the coal mining recovery rate after the optimization of the Wongawilli mining could be improved by 12.3%,which could show that the reform of the Wongawilli mining technique was successful.