党新煤矿4^(-2)+5~#煤层放顶开采可行性研究

Feasibility Study on Top Coal Caving Mining of No.4^(-2)+5~# Coal Seam in Dangxin Coal Mine

以山西朔州平鲁区西易党新煤矿4-2+5#煤层为研究对象,通过模糊综合评价与数值分析的方法对该煤层顶煤冒放性及工作面长度方向上支承压力分布与变化规律进行分析研究。结果表明,该煤层适合采用放顶煤开采且初步确定了顶煤初次垮落步距为7 m,正规循环形成后顶煤的垮落角平均为90°。

Takes the No.4^-2＋5^# coal seam in Dangxin coal mine as the research object,and Dangxin coal mine locates in Pinglu county,Shuozhou city,Shanxi province. Through fuzzy comprehensive evaluation and numerical analysis to analyze top-coal caving ability as well as the distribution and variation of the abutment pressure along the length direction of the working face, The results show that the top coal caving mining is suitable for this coal seam, the first top-coal caving step distance is initially determined to be 7m, and the average top-coal caving angle is 90° after the normal cycle was formed.