深部中央采区下山保护煤柱合理宽度研究

Study on Reasonable Width of Protection Coal Pillar in Deep Central Mining Area

姚桥煤矿中央采区埋深大,服务时间长,采区下山巷道保护煤柱的留设至关重要,既要最大限度地进行资源回收,又要保障采区服务期间下山巷道的稳定性,基于此,论文采用理论计算、数值模拟等方法对保护煤柱合理宽度进行分析。结果表明,不考虑时效特征时,大巷保护煤柱的宽度不应小于75 m;由于采区服务时间长,煤体具有明显的蠕变特征,因此对煤柱的长期稳定性进行了分析,在考虑煤体蠕变效应的情况下,保护煤柱宽度应不小于85 m。

The central mining area of Yaoqiao Coal Mine has a large buried depth and a long service time. It is very important to reserve the protective coal pillar of the downhill roadway in the mining area. It is necessary to maximize the resource recovery and ensure the stability of the downhill roadway during the service period of the mining area. Based on this, the paper analyzes the reasonable width of the protective coal pillar by theoretical calculation and numerical simulation. The results show that the width of protective coal pillar should not be less than 75 m without considering the time effect characteristics;As the service time of the mining area is long and the coal body has ob-vious creep characteristics, the long-term stability of the coal pillar is analyzed. Under considera-tion of the creep effect of the coal body, the width of the protective coal pillar should not be less than 85 m.