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为准确考察海孜矿7煤层上保护层工作面开采后下部卸压保护范围,保障被保护层工作面的顺利接替,应用FLAC-3D数值模拟软件,模拟实际地质条件下的保护层开采行为。研究了受采动影响后的被保护层走向及倾向上的应力分布。应用实际地质条件参数计算得出被保护9煤的应力卸压准则:当煤层最大主应力小于8.18 MPa时,煤层得到充分卸压。结合被保护层应力分布及应力卸压准则研究得出上保护层开采卸压保护范围:风巷侧卸压角为77°,机巷侧卸压角为75°,走向卸压角为63°。这些结果与实测结果基本一致。
In order to accurately examine the scope of pressure relief protection at the lower part of protective seam working face of seam in No.7 coal seam of Haizi Mine and ensure the smooth succession of the protected face, FLAC-3D numerical simulation software was used to simulate protective seam mining under actual geological conditions. The stress distribution on the trend and tendency of the protective layer affected by mining is studied. Applying the actual geological conditions parameters to calculate the pressure relief principle of 9 coal under protection: when the maximum principal stress of coal seam is less than 8.18 MPa, the coal seam is fully decompressed. According to the stress distribution of stress-relief layer and the principle of stress-relief, the pressure-relief protection range of upper protective layer is 77 °, the relief angle is 75 ° and the relief angle is 63 ° . These results are basically consistent with the measured results.