摘要
唐公沟煤矿技术改进前3-2煤层采用的是房柱式开采方式,在进行下位4-2上煤层开采时,顶板的相应区域将受到3-2煤层采空区遗留煤柱的影响而产生应力集中,易造成4-2上煤层开采时两巷片帮、冒顶,工作面煤壁片帮。通过建立UDEC数值模型,研究了4-2上煤层工作面推进过程中3-2采空区遗留煤柱的骨牌失稳现象,分析得出了4-2上煤层工作面位移变化规律及不同煤柱宽度对骨牌失稳效应的影响。
The room and pillar mining was used at 3-2 coal seam before Tanggonggou Coal Mine technological improvement.When the 4-2 upper coal seam is mining,the corresponding area of roof will be affected by 3-2 coal seam goaf pillar and produces stress concentration,which is easy to cause rib spalling,roof fall,workface coal wall rib spalling in 4-2 upper coal seam roadway.According to UDEC numerical model,this paper studies the 3-2 goaf legacy pillar domino instability phenomenon with the advancing of 4-2 upper coal seam workface,analyzes and obtains the workface displacement change laws in 4-2 upper coal seam and the effect of different widths of coal pillar on domino instability phenomenon.
出处
《煤矿安全》
CAS
北大核心
2013年第4期49-51,共3页
Safety in Coal Mines
基金
江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)
国家重点实验室自主课题资助项目(SKLCRSM11X02)
关键词
房柱式开采
位移变化
数值模型
骨牌失稳
room and pillar mining
displacement change
numerical model
domino instability
