Due to the unbalanced top coal drawing process, the recovery ratio is low, and the equipment stability is poor in the longwall top coal caving mining (LTCC) with an inclined seam. Aimed at these problems, this paper proposes the dynamic group caving method (DGCM). The basic procedure is that when the drawn volume of top coal from a support reaches about half, the next support begins drawing top coal, and the drawing process between the two supports is half done. Taking the panel no. 8103 in Beixinyao mine as the research object, the characteristics of drawing body shape, particle movement trace, and variation of recovery ratio are investigated by using Particle Flow Code. Furthermore, the effect of mining-caving ratio on the top coal drawing law under DGCM is revealed by the simulation results, and compared with the single-opening sequence caving method (SSCM) and the double-openings sequence caving method, advantages of DGCM are determined in inclined seams. The results show that the drawing body can be divided into the left and the right under DGCM. Specifically, the drawn top coal particles in the left are from the upper part of this support, that in the right are from the lower part of next support, which verifies the correctness of the theoretical analysis. The characteristics of the drawing body shape are more significant when the mining-caving ratio is relatively small. In addition, with increasing mining-caving ratio, the recovery ratio of the panel both increases gradually under DGCM and SSCM. When the mining-caving ratio is less than 1:1, the recovery ratio of DGCM is obviously higher than that of SSCM, indicating that DGCM can greatly improve the recovery ratio. While when the mining-caving ratio is larger than 1:1, the recovery ratio of two caving methods is basically equal; however, the advancing time is significantly shortened under DGCM. This study are of great significance to realize high efficiency and precise caving in LTCC with an inclined seam.

中文翻译：

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斜煤层LTCC动态群放法顶煤运动规律

在斜煤层长壁放顶煤开采（LTCC）中，由于采顶煤工艺不平衡，采收率低，设备稳定性差。针对这些问题，本文提出了动态群落崩落法（DGCM）。其基本程序是，当一个支架的顶煤提取量达到一半左右时，下一个支架开始提取顶煤，两个支架之间的提取过程就完成了一半。以面板编号。以北新窑矿8103为研究对象，利用粒子流编码对拉体形状、粒子运动轨迹、采收率变化等特征进行了研究。此外，模拟结果揭示了采放比对DGCM下顶煤规律的影响，与单孔顺序放落法（SSCM）和双孔顺序放落法相比，DGCM在倾斜煤层中的优势明显。结果表明，在DGCM下，绘图体可以分为左右两部分。具体来说，左边绘制的顶煤颗粒来自该支座的上部，右边的则来自下一支座的下部，验证了理论分析的正确性。采放比较小时，拉拔体形状特征更为显着。此外，随着采放比的增加，DGCM和SSCM下面板的采收率均逐渐增加。当采放比小于1:1时，DGCM的采收率明显高于SSCM，表明 DGCM 可以大大提高回收率。而当采放比大于1:1时，两种放顶方式的采收率基本相等；然而，在 DGCM 下推进时间显着缩短。该研究对斜煤层LTCC实现高效精准放顶具有重要意义。