“三软”大采高综采面煤壁稳定性及其控制研究

为有效控制“三软”大采高综采面煤壁稳定性,以淮北矿业集团许疃煤矿7219面为工程背景,实测了“三软”煤层大采高综采面煤壁片帮特征,建立了采场煤壁“楔形”滑动体稳定性分析的力学模型,分析了“楔形”滑动体稳定性的关键影响因素.结果表明:“三软”大采高综采面煤壁片帮以上半部片落的“楔形体”滑落形式为主,“楔形”滑动体稳定系数K与C,Ph,μ呈正比关系,与Wo,θ呈反比关系.通过提高支架初撑力、控制端面冒顶、加固煤壁、用好护帮板以及适当提高工作面推进速度等技术措施,7219面煤壁稳定性得到了有效控制.

Coal Wall Stability of Fully Mechanized Working Face with Great Mining Height in Three Soft Coal Seam and Its Control Technology

To effectively control the coal wall stability of fully mechanized working face in "three soft" coal seam,we measured the characteristics of coal wall falling at NO.7219 fully mechanized face with great mining height in Xutuan Coal Mine of Huaibei Mining Group,built the mechanical model for stability analysis of wedge sliding object in coal wall,and analyzed the key effect factors of the sliding object stability.The results show that the coal wall falling in fully mechanized face with great mining height in "three soft" seam occurs mainly in wedge sliding type in the upper part of coal wall,and the stability coefficient of wedge sliding object(K) is proportional to C,Ph and μ,and inversely proportinal to W0 and θ.By adopting technical measures of increasing the support resistance,controlling end face roof fall,strengthening coal wall,correctly using guard plate,appropriately increasing the advancing speed,et al,the coal wall stability of NO.7219 face has been effectively controlled.