摘要
厚煤层发生分岔现象较为普遍,上下分层间夹矸层厚度通常变化较大。当夹矸层厚度较小时,受上部煤层采动影响,夹矸层与下部煤层将会发生不同程度破坏,给下部回采巷道支护带来较大困难。以某矿9采区为工程背景,通过现场实测与采用理论分析,建立了巷道薄夹矸顶板刚化理论,分析了夹矸顶板刚化可行性和刚化后岩层的稳定性,形成了采空区薄夹矸下回采巷道的顶板夹矸稳定性分类分案。将巷道顶板分为夹矸层厚大于5m、3~5m和小于3m三类,提出了三类薄夹矸回采巷道的支护方案。
Bifurcation often occurs in thick coal seams,the thickness of the band between the upper and lower layers usually varies greatly. When the band thickness is small,the band and the lower coal seam are affected by the mining of the upper coal seam and will be damaged, which brings great difficulties to the support of the lower mining roadway. Taking the No. 9 mining area of one coal mine as engineering background,with site measurement and theory analysis, rigidification theory of roof slab with thin band was established. The feasibility of rigidification and the stability of strata after rigidity were analyzed, and the classification of the stability of the top-bed refuse in the mining roadway with thin section of goal under goaf was formed. Three types of roadway roof were divided into three categories： band layer thickness greater than 5 m,3-5 m and less than 3 re,and three types of support schemes were proposed.
出处
《中国矿业》
北大核心
2017年第6期102-106,共5页
China Mining Magazine
基金
国家自然科学基金项目资助(编号:51504145
51574155)
山东科技大学人才引进基金项目资助(编号:2014RCJJ035)
关键词
煤层分岔
采空区
薄夹矸
顶板刚化
coal seam bifurcation
goaf
thin band
roof stiffening
