摘要
在综采工作面过上层集中煤柱期间,顶板的破断结构对矿井的整体稳定性和安全性有着重要影响。集中煤柱的存在会导致围岩应力发生复杂变化,直接影响顶板和周围岩层的稳定性。对工作面过集中煤柱时受力、矿压显现特征进行研究。结果表明,在工作面进上层集中煤柱阶段时,部分顶板垮落会同时作用于下层工作面,导致下层采场出现明显的矿压显现现象。同时工作面出上覆集中煤柱阶段时,上层集中煤柱失稳,运移活动更频繁,其矿压显现也更剧烈。模拟研究了31110综采工作面过上覆集中煤柱围岩应力分布规律,研究结果表明,采场应力场在下层煤工作面过集中煤柱期间急剧增加,顶板存在严重失稳隐患。通过采取矿压监测、施工大直径卸压孔、顶板管理及单体支护一系列过集中煤柱管控措施,成功回采了31110综采工作面。
In the period of fully mechanized mining face crossing upper-layer concentrated coal pillar,the broken structure of the roof has an important influence on the overall stability and safety of the mine.The existence of concentrated coal pillar will lead to complex changes in surrounding rock stress and directly affect the stability of roof and surrounding rock strata.The characteristics of stress and mine pressure behavior with the working face crossing concentrated coal pillar are studied.The results show that:When the coal pillar is concentrated in the upper layer of the working face,part of the roof caving will act on the lower working face at the same time,resulting in obvious mine pressure appearing in the lower stope.When the working face is in the stage of overlying coal pillar,the upper coal pillar is unstable,the migration activity is more frequent,and the law of mine pressure appearance is more intense.The stress distribution law of surrounding rock of the 31110 fully mechanized coal face passing the overlying coal pillar is simulated.The research results show that the stope stress field increases sharply during the period of the overlying coal pillar,and there is a serious instability hidden danger in the roof.By adopting a series of over-concentrated coal pillar control measures,such as mine pressure monitoring,large-diameter pressure relief hole,roof management and single support,the safe and efficient mining of the 31110 fully mechanized mining face has been guaranteed.
作者
陈鑫
CHEN Xin(Cuncaota Coal Mine,CHN Energy Shendong Coal Group Co.,Ltd.,Ordos 017209,China)
出处
《陕西煤炭》
2025年第8期27-31,共5页
Shaanxi Coal
关键词
集中煤柱
矿压显现特征
顶板失稳
数值模拟
concentrated coal pillar
mine pressure behavior characteristics
roof instability
numerical simulation
