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采区上山保护煤柱的长期稳定性对矿井安全生产具有重要影响,针对孔庄煤矿典型深部开采中IV1采区上山保护煤柱的蠕变变形及长期稳定性问题,采用现场实测、蠕变试验及数值模拟相结合的方法开展研究。现场实测表明,7433工作面超前支承压力明显影响范围为73 m。基于蠕变试验结果,采用改进的Burgers模型回归求得煤样蠕变参数,在此基础上,对煤柱的蠕变特性及长期稳定性进行了数值模拟计算。结果表明,当煤柱宽度大于85 m时,再增加煤柱宽度,其趋于稳定的时间及蠕变变形量相差不大,当煤柱宽度小于85 m时,随着煤柱宽度减小,煤柱趋于稳定的时间越来越长,变形量也逐渐增大。考虑深井煤柱的长期稳定性,IV1采区上山保护煤柱的合理宽度不应小于85 m。矿压监测结果表明,监测期内上山保护煤柱处于较好的稳定状态。
The long-term stability of coal pillar in mining area has important influence on coal mine safety production. In view of the creep deformation and long-term stability of coal pillar in IV1 mining area in the typical deep mining of Kongzhuang Coal Mine, field test and creep test And numerical simulation methods to carry out research. Field measurements show that 7433 working face advance support pressure significantly affected the range of 73 m. Based on the creep test results, the creep parameters of coal samples were obtained by the improved Burgers regression model. On this basis, the creep characteristics and long-term stability of coal pillar were numerically simulated. The results show that when the width of coal pillar is more than 85 m, the width of coal pillar is increased, and the time and the amount of creep deformation are almost the same. When the width of coal pillar is less than 85 m, Pillar tends to be stable for longer and longer, the amount of deformation is also gradually increased. Considering the long-term stability of deep coal pillars, the reasonable width of the protective pillars in the IV1 mining area should not be less than 85 m. Rock pressure monitoring results show that during the monitoring period, the coal pillar in the mountain is in a good stable state.