采空区下特厚煤层采场围岩控制研究

Study on Control of Surrounding Rock in Stope of Thick Coal Seam below Goaf High

根据现场实际条件,利用理论分析,对某矿采空区下特厚煤层顶板结构进行分析,并对直接顶和基本顶的运移规律进行研究,得出13#煤层开采后可形成平衡结构,与现场实测吻合,为采场围岩控制提供了理论依据;根据砌体梁理论和载荷估算法,结合该矿工作面实测数据,对工作面支架阻力进行预测,得出15 000 k N的液压支架基本可以满足生产需求,但存在压架危险,并针对工作面实际情况,提出了弱化煤柱、弱化基本顶的防治措施,以保障工作面的安全开采。

Based on the actual conditions of the site,using theoretical analysis,the roof structure of a very thick coal seam under a mined-out area is analyzed,and the transport laws of the direct roof and the basic roof are studied.It is concluded that the No. 13 coal seam can be balanced after mining. The structure,which is consistent with the actual measurement on site,provides a theoretical basis for the control of surrounding rock in the stope. According to the masonry beam theory and load estimation method,combined with the measured data of the working face of the mine,the support resistance of the working face is predicted,and it can be concluded that the 15,000 k N hydraulic support can basically meet the production demand,but there is risk of supports being pressured unmovable and the working face In actual conditions,prevention and control measures for weakening the coal pillar and weakening the basic roof are proposed to ensure the safe mining of the working face.