沿空掘巷小煤柱合理留设与联合支护技术研究

Study on Reasonable Setting of Small Coal Pillar and Combined Support Technology of Gob-side Entry

针对山西王家岭煤矿2#煤的开采巷道小煤柱合理宽度设计的问题,先确定支护方式,其次运用极限平衡理论,得出沿采空区留设的小煤柱宽度范围,再运用FLAC^(3D)软件分析4、5、6 m宽度煤柱的数值模拟结果,观察该联合支护方式下,在掘进巷道时留设小煤柱的竖直及水平位移随煤柱宽度增加的变化趋势,以及在煤体工作面开采时,各宽度煤柱和巷道的塑性区分布。

Aiming at the design of reasonable width of small coal pillar for mining roadway of No.2 coal seam of Wangjialing coal mine in Shanxi province,the support mode is preliminarily determined in this paper,then the limit equilibrium theory is used to obtain the range of small coal pillar width along the goaf. Use FLAC^3D software to analyze the numerical simulation results of the coal pillar with width of 4,5 and 6 m and observe the vertical and horizontal displacements of small coal pillars with the increase of coal pillar width under the combined support. Also observe the distribution of plastic zones of coal pillars and mining roadways with different widths when exploring the coal working face.