煤层群双重保护层开采煤层膨胀变形规律实验研究

Experimental Study on Swelling Deformation Law of Mining Seam in Dual Protective Seam of Seam Group

为了得到煤层群双重保护层开采时煤层膨胀变形特征,用相似材料模拟实验的方法研究了贵州金佳矿依次开采22#、18-1#煤时被保护层17#煤和18#煤的膨胀变形规律。结果表明:开采22#煤时被保护层走向方向上均分为压缩区、迅速膨胀区、膨胀量减小区、膨胀量稳定区四个区域,但在双重保护层开采时,17#、18#煤再次经历压缩、膨胀量增大、减小、稳定的过程后四个区域重新分布;倾向方向上膨胀变形曲线均呈"M"型;17#煤、18#煤膨胀变形的主导因素分别为开采22#煤、18-1#煤保护层。

In order to obtain the seam swelling and deformation features during the mining in the dual protective seam in the seam group,the simulation experiment method with the similar materials was applied to investigate the swelling and deformation law of No.17 protected seam and No.18 protected seam during the sequence mining in No.22 seam and No.18-1 seam of Guizhou Jinjia Mine.The results showed that during the mining in No.22 seam,the strike direction of the protected seam was divided to four regions,including the compressed region,rapid swelling region,swelling reduced region and swelling stabilized region.During the mining in the dual protective seam,No.17 and No.18 seams were experienced with the redistribution of the four regions after the process of the compression and the swelling increased,reduced and stabilization.On the inclination direction of the seam,the swelling deformation curve was in ＂M＂ mode.The major factors of the swelling deformation in No.17 and No.18 seams were the mining in No.22 and No.18-1 protective seams.