摘要
针对寺河煤矿二号井采掘接替紧张、回采率低等问题,运用理论分析和数值模拟的方法,进行爆破切顶沿空留巷无煤柱开采技术试验。研究结果表明:切顶高度与应力集中和巷道表面位移呈负相关,切顶角度与应力集中和巷道表面位移呈正相关,最优切顶高度为8 m,切顶角度为10°;顶板切顶成缝明显,留巷达到预期效果;巷道补强加固措施设计合理,平均顶底板移近量为254.7 mm,平均两帮移近量为113.1 mm;成巷效果能满足下一工作面安全生产的要求;形成了适合寺河煤矿二号井地质条件下的切顶卸压沿空留巷及围岩控制技术体系。
In view of the problems of tight replacement and low recovery rate in Sihe coal mine No.2 well, the technical test of top cutting and pressure relief and gob side entry retaining without coal pillar is carried out by means of theoretical analysis and numerical simulation.The results show that: the roof cutting height is negatively related to stress concentration and roadway surface displacement, and the roof cutting angle is positively related to stress concentration and roadway surface displacement. The optimal roof cutting height is 8 m and the roof cutting angle is 10°. The roof cutting seam is obvious and achieves the expected effect. The roadway reinforcement measures are designed reasonably, the average displacement of roof and floor is 254.7 mm, and the average displacement of two sides is 113.1 mm.The results show that the roadway forming effect can meet the requirements of safety production of the next working face;the technical system of roof cutting and pressure relief and gob side entry retaining suitable for the geological conditions of Sihe coal mine is formed.
作者
赵栋玉
ZHAO Dong-yu(Majialiahg Coal Company,Jinneng Holding Group,Shuozhou 036000,China)
出处
《煤炭技术》
CAS
北大核心
2021年第8期44-48,共5页
Coal Technology
关键词
沿空留巷
切顶卸压
数值模拟
矿压显现
gob side entry retaining
cutting top and pressure relief
numerical simulation
underground pressure behavior
