A mechanical model was established by taking the section coal pillar reserved in B8 steep seam in Nanshan Coal Mine as the engineering background and the destabilization of coal pillars as the critical condition, the size of the section pillar of the coal seam with dip angle of 40° was calculated theoretically, and it was concluded that a 20 m-wide coal pillar should be reserved. A numerical model was established for verification, and the stress characteristics of coal pillars and the destabilization characteristics of rock stratum were respectively simulated in the conditions of coal pillar size of 5 m, 10 m, 15 m and 20 m. The simulation results showed that a coal pillar with a reasonable width from 15 to 20 m should be reserved.%以南山煤矿大倾角B8煤层区段煤柱留设为工程背景,以煤柱失稳为临界条件建立力学模型,理论计算煤层倾角40°时区段煤柱的尺寸,得出煤柱宽度留设20 m左右.建立数值模型进行验证,分别模拟煤柱宽度为5、10、15、20 m条件下煤柱的应力特征、岩层失稳特征,模拟结果表明,煤柱宽度留设15~20 m较合理.
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