摘要
Abstract
With the continuous increase of coal mining depth,the problem of mine pressure control in Jingfang Coal Mine becomes increasingly prominent.The relatively large retention coal pillars cause serious resource waste,which can easily lead to safety issues such as roadway deformation,roof collapse and so on.To this end,based on the basic principles and process flow of narrow coal pillar pressure relief mining technology(PRMT),combined with the geological conditions of the 3-606 fully mechanized mining face,liquid directional roof cutting technology and constant resistance large deformation anchor cable support technology are proposed,and engineering application is carried out through optimized construction and design schemes.The results indicate that the use of narrow coal pillar pressure relief mining technology achieves the purpose of no advanced excavation,narrow coal pillar retention,and roof pressure relief.During the monitoring period,the deformation control of the roadway surrounding rock is good,and the deformation amount of the roof and floor during the stable stage is 40-60 mm,without the occurrence of wall caving phenomenon.The roof above the rear joint-cutting stops basic movement,and the roof enters a stress equilibrium state again.The research results are of great significance for optimizing mining design,improving resource recovery rate,and ensuring mine safety.关键词
采煤/切顶/留巷Key words
coal mining/roof cutting/retaining roadway分类
矿山工程
