基于PFC2D的综放工作面放煤步距研究

Research on coal caving step distance at fully mechanized caving face based on PFC2D

为了确定成庄煤矿2200综放工作面合理的放煤参数,本文依据散体介质相似理论和现场数据,运用PFC2D(散体颗粒流)数值模拟软件的试验方法,研究不同放煤步距对顶煤移动放出规律、煤岩流动轨迹以及顶煤的回收率和含矸率的影响。通过模拟得出最优的放煤方式,在此基础上运用PFC软件模拟分析选择最佳的放煤步距。结果表明,2200工作面最优放煤方式为两采一放,最佳的放煤步距为1.6m。

In order to determine the reasonable coal caving parameters in 2200 fully mechanized caving face in Chengzhuang Coal Mine,based on granular media theory and field data,the author studied the influence of coal caving step distance on top coal caving rules,coal-rock flow track,top coal recovery and refuse content by using PFC2D（granular particle flow） test method.By numerical simulation,the optimal caving way was achieved as ＂mining twice and caving once＂,and based on which the best caving step distance was determined as 1.6 m.