摘要
为了探究近距离薄煤层工作面回采过程中不稳定层间距顶板的破裂断开以及来压规律,以官地煤矿3318工作面为研究对象,通过理论分析、数值模拟和现场实测等方法开展研究。理论研究结果表明,工作面回采过程中顶板的破断满足散体破坏结构,覆岩块段会形成散体失稳滑落现象;模拟结果证明,当顶板结构的强度较低时,就会失去支撑作用,伴随工作面的回采,顶板不断垮落,发生微弱矿压显现;利用现场实测的数据研究分析矿压显现规律,得到工作面的周期来压步距为22 m,首次来压步距是26 m,矿压显现规律基本与数值模拟结果吻合。
In order to explore the roof breaking and weighting law of unstable layer spacing in the mining process of short-distance thin coal seam working face,taking 3318 working face of Guandi Coal Mine as the research object,the research is carried out by means of theoretical analysis,numerical simulation and field measurement.The theoretical research results show that the roof breaking in the mining process of the working face meets the loose-body failure structure,and the overburden block has the phenomenon of loose-body instability and sliding.The simulation results show that when the strength of the roof structure is low,it will lose its support function,and weak ground pressure behavior will occur with the continuous collapse of roof of the working face.The field ground pressure observation shows that the periodic weighting step distance of the working face is 22 m and the first weighting distance is 26 m.The ground pressure behavior law is basically consistent with the numerical simulation results.
作者
雷建华
LEI Jianhua(Safety Production Management Center,Shanxi Coking Coal Group Co. ,Ltd. ,Taiyuan 030000,China)
出处
《陕西煤炭》
2021年第6期17-21,67,共6页
Shaanxi Coal
基金
国家自然科学基金(51774230)“大倾角伪俯斜采场支架与围岩系统四维作用机理及稳定性研究”
国家自然科学基金重点项目(56134007)“大倾角煤层长壁工作面安全高效开采基础研究”。
关键词
顶板破断
散体滑落
来压步距
超前支承压力
矿压显现
roof breaking
loose-body slipping
weighting step
advance bearing pressure
ground pressure behavior
