西安科技大学学报2018，Vol.38Issue(1)：71-78,8.DOI:10.13800/j.cnki.xakjdxxb.2018.0111
近距离上保护层开采下伏煤(岩)裂隙时空演化过程分析
Analysis of the fracture spatial-temporal development process of underlying coal(rock)through the mining of a close upper protective layer
摘要
Abstract
To study the fracture space-temporal development characteristics of underlying coal(rock)af-ter the mining of a close upper protective layer,the No.5 coal mine of Pingdingshan TianAn Coal Co. Ltd was taken as an example(the average distance between the protective layer and the protected layer is 8 m).Numerical simulation was carried out using 3DEC software,and the fracture development and distribution characteristics of coal(rock)were simulated under different mining distance. Then the effect of protective layer mining was verified by the pressure-relief gas drainage data of protected layer. The results show that with the working face of protective layer advancing continuously,the fractures in underlying coal(rock)gradually develop and extend to the deep.From 8 m of the mining distance,the fractures appear in the protected layer;when the mining distance is 18 m,the transverse and vertical fissures develop obviously.However,due to the collapse of overburden rock in goaf,these fractures will be closed.In horizontal direction,the fractures in underlying coal(rock)can be divided into 3 areas in-cluding original state area,high pressure relief area and re-compaction area.As the effect of pressure unloading became more and more obvious,there was an obvious increase for the drainage quantity of pressure-relief gas of protected layer from June 2014 to November 2014,and the maximum value reached 174 400 m3/month;Afterwards,due to the closure of fractures in protected layer,gas drainage quantity of each month began to decrease,and gradually stabilized at 50 000 m3/month.关键词
近距离上保护层/裂隙发育/煤(岩)变形特征/数值模拟Key words
close upper protective layer/fracture development/deformation characteristics of coal (rock)/numerical simulation分类
资源环境引用本文复制引用
陈荣柱,涂庆毅,程远平,刘庆峰..近距离上保护层开采下伏煤(岩)裂隙时空演化过程分析[J].西安科技大学学报,2018,38(1):71-78,8.基金项目
国家自然科学基金(51574229) （51574229）
