含硬煤分层厚煤层放煤工艺参数优化研究

 摘要：针对秦源煤矿含硬煤分层综放面放出煤块大，单架放煤时间长，放出率低的问题。通过PFC2D数值模拟和现场工业试验相结合的方法，分析了不同放煤步距和放煤方式对煤矸流动形态及顶煤损失特征的影响。得出采用两刀一放单轮间隔放煤的放煤方式，能加强对顶煤的扰动改善含硬煤分层顶煤的冒放性，同时有效控制含矸率，提高顶煤回收率。

Study on top-coal caving parameters optimization in thick coal with hard coal dissection

Abstract: According to the problems of Qinyuan coal mine’s top-coal caving face with hard coal dissection: coal pieces are too big, the caving time of each support is too long, and release rate is low. Through numerical simulation using PFC2D and field experiment, analyzed the effect of different caving pace and different caving method on configuration character of coal and gangue flow and the character of top coal loss. Draw out that using the sublevel caving with two passing cutting could strengthen the disturbance of top-coal and improve the caving characteristic, and effectively control waste content at the same time and improve the coal recovery ratio.