摘要
Abstract
In order to tackle the challenges of coal resource mining beneath the industrial square and villages in Yuecheng Coal Mine,as well as gangue disposal,the mine plans to adopt a short-wall interval paste filling mining technology system.By constructing a phased mining model of"mining one and retaining two"and employing an interval filling process with skip mining,the working face is divided into composite units of 5m branch roadways and 10 m coal pillars,forming a three-phase alternating advancement system for simultaneous mining and filling.Research indicates that the paste mix(cementitious material 200 kg/m3,fly ash 350 kg/m3,gangue 1250 kg/m3)achieves a 28-day strength of≥3.5 MPa and an active roof-contact expansion rate of 5%～10%.The collaborative filling process with dual discharge outlets ensures a roof-contact rate exceeding 95%,reducing the mining-filling cycle to 7 days per coal pillar.The predicted maximum surface subsidence is 135 mm,with horizontal deformation of 0.30 mm/m,both below the Grade I damage threshold for buildings(structures).Engineering applications demonstrate that this technology processes 900,000 tons of gangue annually,releases 593,000 tons of trapped coal,and generates comprehensive benefits of 153 million yuan.关键词
短壁间隔矸石充填/充填材料配比/地表变形/经济效益Key words
short-wall interval gangue filling/filling material ratio/surface deformation/economic benefits分类
矿业与冶金
