蹬空条件下上提面回采巷道顶板运动特征研究

Characteristics of Roadway’s Roof Movement under Floor Failure in Longwall with Increased Upper Mining Limit

提高回采上限工作面(上提面)的回采巷道由于受到底部蹬空采动影响,矿压显现较浅部其他回采巷道更加剧烈,为安全生产需研究其老顶运动特征。通过悬臂梁理论计算拟合远距离上覆工作面及回采巷道基本顶受下部蹬空回采影响在初始影响段的下沉挠度曲线;并通过数值模拟计算对比分析了理论计算结果及进一步计算分析了上覆工作面及回风巷的基本顶运动变形特征。结果表明:数值模拟计算曲线与理论拟合曲线较好吻合,结合工程实践,其计算过程能够很好地反映顶板运动变形特征。研究结果能为类似条件下回采巷道布置提供一定参考依据。

Due to upper mining limit of longwall is increased, roadway is affected by floor failure, which strata stress occurrence is more obvious than that in other shallow roadways. In order to assure safe mining the charac- teristics of roof movement are needed to study. By theoretical calculation of cantilever beam, subsidence deflec- tion curves of fundamental roof of the wall and roadway wich were influenced by lower seam mining, were fitted. Theoretical calculation results were compared with numerical simulation calculation results. Further more deform- ation characteristics of the wall and fundamental roof of return airway were calculated. The results showed that theoretical curve was well fitted with numerical simulation curve. Combining with engineering practice, the cal- culation results well reflect deformation characteristics of fundamental roof movement. The results provide a refer- ence to roadway layout under the similar conditions.