浅埋综放工作面迎采掘进沿空巷道围岩控制技术研究

Study on Surrounding Rock Control Technology of Gob-side Roadway in Shallow Fully Mechanized Top Coal Caving Face

针对浅埋煤层迎采掘进沿空巷道围岩应力环境复杂,围岩稳定性差,常规支护手段控制巷道围岩变形收效甚微现状,以镇城底矿22213工作面为工程背景,分析了浅埋综放工作面矿压显现基本规律,基于迎采掘进巷道与上区段回采工作面间的空间关系,揭示了迎采掘进沿空巷道围岩控制的关键在于有效控制采动影响阶段和采空区动压影响阶段的巷道围岩变形。通过留设合理宽度煤柱、实施迎采掘进沿空巷道围岩动态分段控制以及构建巷道围岩浅部-深部承载圈等方式,综合提出了迎采掘进沿空巷道围岩控制技术,有效构建围岩浅部-深部承载结构,维持巷道稳定。

In view of the complex stress environment and poor stability of surrounding rock in goaf roadway during face mining in shallow coal seams,and the limited effectiveness of conventional support methods in controlling roadway surrounding rock deformation,based on the engineering background of 22213 working face in Zhenchengdi Mine,the basic law of rock pressure behavior in shallow fully mechanized top coal caving working face was analyzed,based on the spatial relationship between face mining roadway and upper section mining working face,It is revealed that the key to the control of surrounding rock in gob-side roadways during face mining is to effectively control the deformation of surrounding rock in the stages affected by mining and dynamic pressure in the goaf.By reserving a reasonable width of coal pillar,implementing dynamic segmented control of surrounding rock in goaf roadway during face mining,and constructing a shallow deep bearing zone of surrounding rock in roadway,a comprehensive control technology for surrounding rock in goaf roadway during face mining is proposed,effectively constructing a shallow deep bearing structure of surrounding rock,and maintaining roadway stability.