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运用相似材料模拟和数值模拟相结合的方式,对百子煤矿8号和5号煤层进行模拟开采.相似模拟研究表明:8号煤层柱式开采时,其底板压力以2.67MPa的原岩应力值为基准窄幅波动,8号煤层开采后所留煤柱保持稳定.5号煤层走向长壁开采时,煤层底板支承压力最大值为3.92MPa,远低于8号煤层煤柱11.8MPa的承载极限.数值模拟表明:5号煤层开采时,其下部煤柱垂向应力明显减小,在8号煤层柱采区形成减压区.5号煤层上行开采过程中8号煤层所留煤柱保持稳定.“,”By means of similar material simulation and numerical simulation, mining of No.8 and No.5 coal seams in Baizi Coal Mine is simulated. Similar simulation results show that the bottom plate pressure of No.8 coal seam is fluctuated on the stress value of the original rock of 2.67MPa and the coal pillars remain stable after completion of No.8 coal seam. For No.5 coal seam, the maximum abutment pressure of coal floor is 3.92MPa, which is much lower than that of coal pillar(11.8MPa). The numerical simulation shows that the vertical stress of the lower coal pillar is obviously reduced when No.5 coal seam is mined out and the decompression zone is formed in the coal mining area. In the process of upward mining of No.5 coal seam, the remaining pillar in No.8 coal seam stay stable.