采矿与安全工程学报2016，Vol.33Issue(4)：571-577,7.DOI:10.13545/j.cnki.jmse.2016.04.001
采空区渗透率演化规律及卸压开采效果研究
Research on permeability evolution law of goaf and pressure-relief mining effect
摘要
Abstract
In order to study the permeability evolution law and distribution characteristics of goaf dur-ing protective seam mining and its pressure-relief mining effect, a calculation model to calculate gas flow rate of drilling well extracting gas from goaf and pressure-relieved seams has been simplified. This model has made full use of gas extraction monitoring data of the working face 1242(1) of a coal mine in Huainan city. Combined with Darcy’s law, the equivalent permeability of goaf has been obtained. Meanwhile, by fitting gas extraction volumes from protected seam, thedecline coefficient of gas extrac-tion has been obtained. A decrease multiples ofdecline coefficient has been introduced to reflect the pressure-relief performance of protective seam mining. The results have shown that: 1) The permeability evolution of goaf has experienced three stages including sharp rise stage, the decline stage, and the sta-ble stage. Longwall face advancing distances of the first two stages are 19.24 m and 186.2 m respec-tively. The permeability in the middle of the compacted goaf is much smaller than the permeability on the edge of goaf, and presents O shape trend after longwall face mining. 2) Gas extraction volume from protected seam has also experienced three stages including sharp rise stage, the decline stage and the stable stage. The time of the first two stages are 10 d and 125 d. 3) Decrease multiples of decline coeffi-cient of 1# drilling well is as high as 7.7, which has indicated that the protective seam mining has great pressure-relief effect.关键词
地面钻井抽采/卸压开采/渗透率计算模型/采空区/衰减系数Key words
surface well drilling/pressure-relief mining/permeability calculation model/goaf/decline coefficient分类
矿业与冶金引用本文复制引用
屠世浩,张村,杨冠宇,白庆升,闫瑞龙..采空区渗透率演化规律及卸压开采效果研究[J].采矿与安全工程学报,2016,33(4):571-577,7.基金项目
国家自然科学基金项目(51374200)；国家高技术研究发展计划(863)项目(2012AA062101)；江苏高校优势学科建设工程项目 （51374200）
