摘要
采用FLAC3D对保护层开采围岩应力分布进行了数值模拟,得出保护层开采围岩卸压特征和上下被保护层倾向卸压范围。结果表明:在倾斜剖面中保护层采空区上方中部偏上区域围岩卸压效果最好,保护层上方采动影响范围沿保护层法线方向可达60 m左右,保护层下方采动影响范围沿保护层法线方向可达40 m左右,保护层对上被保护层上部影响角为75°,下部影响角为48°,保护层对下被保护层上部影响角为60°,下部影响角为42°,研究结果可为矿井煤与瓦斯突出防治工作提供科学依据。
A number of numerical simulation tests were carried out using the numerical analysis code FLAC3D to investigate stress distribution of surrounding rock of protective seam.Obtaining the pressure-relief characteristics and scope of pressure-relief of upper and lower protected seam along the tilt direction.The results show that the best pressure-relief zone is located at above middle partial upper position of goaf along the tilt direction,mining influence range above protective seam reaches 60m approximately along the normal direction of protective seam,and mining influence range below protective seam reaches 40 m approximately along the normal direction of protective seam,upper influence angle of protective seam to upper protected seam is 75°,lower influence angle of protective seam to upper protected seam is 48°,upper influence angle of protective seam to lower protected seam is 60°,lower influence angle of protective seam to lower protected seam is 42°.This result can provide a scientific support for precaution and treatment of coal and gas outburst in mine.
出处
《煤》
2011年第5期10-12,共3页
Coal
关键词
保护层开采
卸压效应
应力分布
数值模拟
煤与瓦斯突出
protective seam mining
pressure-relief effect
stress distribution
numerical simulation
coal and gas outburst
