Research on the Distribution Characteristics of the Bulking Coefficient in the Strike Direction of the Longwall Goaf Filled with Slurry

Coal gangue slurry filling is an important technical means for harmless and large-scale disposal of under low-interference conditions, one the most ways to achieve green mining, which in line with national concept development. This paper systematically expounds background scientific connotations birth filling, clarifies key technology process principles constructs lag distance optimization method based on bulking coefficient. In order explore distribution law coefficient overburden broken zone mining process, UDEC numerical simulation similar simulations were used analyze movement a coal seam roof characteristics The results show that evolution spatial structure overlying strata goaf, subsidence decreases from bottom top, finally becomes stable. advancing direction working face, continuously, shows certain zoning characteristics. With it moves forward periodically dynamic changes. strike direction, can be divided into three areas: natural accumulation area, load-affected area gradual compaction area. Finally, determined 60 m, effect adjacent grouting good field test.