考虑长期稳定性的深井采区上山保护煤柱合理留设

发布时间：2019-03-29 08:03

【摘要】：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。
[Abstract]:The long-term stability of Shangshan protective pillar in the mining area has an important influence on the safety of mine production. In view of the creep deformation and long-term stability of the IV1 coal pillar in the typical deep mining area of Kongzhuang Coal Mine, the field measurement is adopted. The method of combining creep test with numerical simulation is studied. The field measurement shows that the influence range of leading supporting pressure in 7433 face is 73 m. Based on the creep test results, the creep parameters of coal samples are obtained by using the improved Burgers model. On the basis of this, the creep characteristics and long-term stability of coal pillars are numerically simulated. The results show that when the width of coal pillar is larger than 85 m, when the width of coal pillar is larger than 85 m, the time of stabilization and creep deformation is not much different. When the width of coal pillar is less than 85 m, the time of stabilization of coal pillar becomes longer and longer as the width of coal pillar decreases. The deformation also increases gradually. Considering the long-term stability of deep coal pillar, the reasonable width of IV1 coal pillar should not be less than 85 m. The monitoring results of mine pressure show that the coal pillar of mountain protection is in a good stable state during the monitoring period.
【作者单位】：山东科技大学矿业与安全工程学院矿山灾害预防控制省部共建国家重点实验室培育基地;山东农业大学水利土木工程学院;西山煤电(集团)有限责任公司马兰煤矿;
【基金】：国家自然科学基金项目(51379116,51574156) 山东省自然科学基金重点项目(ZR2013EEZ001)
【分类号】：TD822.3

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