Influence on the backfill ratios of backfilling on the structural stability of gob-side entry retaining

Based on the technical characteristics of fully-mechanized backfill mining with solid waste,mechanical analysis and numerical simulation were used to analyze on the influencing relationship between backfill ratios and the structural stability of gob-side entry retaining.The result shows that:the stress and deformation of surrounding rock decreases with the increasing backfill ratio.The support scheme of "build wall with waste+anchor bolt" was obtained based on the research result,and it has been applied successfully in Wugou coal mine.The field measurement showed that:when the backfill ratio reached to 85%,the sides deformation of roadway was only 120 mm,and the roadway could be used normally.