煤层大巷支护参数优化技术研究

Research on supporting parameter optimization technology of main roadways in coal mine

针对煤层大巷支护形式的可行性和经济性问题,以某矿3-2煤层回风大巷为工程背景,对其原支护形式进行初次优化,采用数值模拟方法对其进行验证。研究表明,3-2煤层回风大巷开挖后和首采32101工作面回采至终采线时,两种支护形式下的大巷最大主应力和位移量相差不大,但初次优化后锚杆间排距减小,支护成本减少。由于煤层埋深浅和顶底板条件较好,在初次优化支护形式的基础上进行最终优化,优化后的支护方式中去掉锚索支护,最终优化后的支护形式现场应用后效果较好,实现了该条件下的煤层大巷支护形式的可行性与经济性。

In view of the feasibility and economic problems of the supporting form of main roadways in coal mine,taking the 3-2 coal seam return airway of a certain mine as the engineering background,the original supporting form was optimized for the first time,and verified by numerical simulation method.The research showed that there was little difference between the maximum principal stress and displacement of the main roadway under the two supporting forms after the excavation of the No.3-2 coal seam return air roadway and the stoping line of the first mining of No.32101 working face,but the row distance between the bolts decreased after the initial optimization,and the supporting cost decreased.Due to the shallow burial depth of the coal seam and the good conditions of the roof and floor,the final optimization was carried out on the basis of the initial optimization of the supporting form.The optimized supporting form removed the anchor cable supporting,and the final optimized supporting form had better effect after field application,realizing the feasibility and economy of the main roadways in coal seam supporting form under this condition.