Strata movement controlling effect of waste and fly ash backfillings in fully mechanized coal mining with backfilling face

• Published in: Mining science and technology (China) 2011-09, Vol.21 (5), p.721-726
• Main Authors: Zhang, Jixiong, Zhang, Qiang, Huang, Yanli, Liu, Jinwei, Zhou, Nan, Zan, Dongfeng
• Format: Article
• Language: English
• Subjects: Backfilling; Backfilling body (BB); Coal; Coal mines; Computer simulation; Equivalent mining thickness; FMCMB; Mathematical models; Mining; Movement; Numerical simulation; Strata; Strata movement; Waste and fly ash; 回填; 固体废物; 岩层移动; 开采厚度; 控制效果; 模拟地层; 煤炭开采; 综采
• ISSN: 1674-5264; 2212-6066
• DOI: 10.1016/j.mstc.2011.03.003

A fully mechanized coal mining with backfilling （FMCMB） provides advantages of safety and efficiency for coal mining under buildings, railways, and water bodies. According to the field geological conditions, we analyzed the controlling effect of strata movement by the waste and fly ash backfilling in FMCMB face. Based on the key strata theory, we established the equivalent mining thickness model, and analyzed the action of the bulk factor of backfilling body to the equivalent mining thickness. In addition, we numerically simulated the controlling function of the strata movement by backfilling bodies with different strength. And the numerical simulation result show that the deformation of stratum and the subsidence of surface can be controlled by FMCMB. The result provides references to the effective execution of fully mechanized coal mining with solid waste backfilling in goaf.