School of Mining, 71206Guizhou University, Guiyang, China.
Sci Prog. 2023 Jan-Mar;106(1):368504231152739. doi: 10.1177/00368504231152739.
Aiming at the problem that it is difficult to popularize in Guizhou mining area due to high filling cost, taking 11071 working face of Panzhihua Coal Mine in Liupanshui as the research background, the idea and technology of strip interval filling mining are put forward. Through theoretical analysis and mechanical tests, the reasonable range of strip spacing distance and mechanical parameters of filling body were obtained. The FLAC3D simulation software is used to analyze the stress field, displacement field, and plastic zone of five kinds of design schemes, and the UDEC simulation software is used to carry out the filling mining of No.7 coal seam. The results show that the strip interval filling mining technology regards the empty roof area as a controllable underground spatial structure, and the single spatial stress field changes little. The load on the immediate roof is gradually transferred from the top of the empty roof area to the top of the filling body. The "filling body-direct roof" structure improves the self-bearing capacity of the immediate roof, and the overlying surrounding rock migration is controlled. With the increase of mining depth, it gradually tends to the original rock stress, and the control effect on surface subsidence is more significant. Finally, "filling 3 m interval 3 m" is determined as the optimal filling scheme. In the process of simulated filling mining, the peak stress in the stress concentration area of the front coal wall shows a trend of "increase-decrease-increase," and the peak stress curve of the immediate roof in the middle of the stope changes from "increase-decrease 'trend to' increase-decrease-increase-decrease" trend. The rock layer near the immediate roof is in a stress concentration state in the coal wall area on both sides, and the middle part is not obvious.
针对贵州矿区充填成本高、推广困难的问题，以六盘水盘江煤电集团公司下属的攀枝花煤矿 11071 工作面为研究背景，提出了条带间隔充填开采的思路和技术。通过理论分析和力学试验，得出了合理的条带间距和充填体力学参数范围。利用 FLAC3D 模拟软件对 5 种设计方案的应力场、位移场和塑性区进行了分析，利用 UDEC 模拟软件对 7 号煤层进行了充填开采。结果表明：条带间隔充填开采技术将采空区顶板区域视为可控制的地下空间结构，单一空间的应力场变化不大。直接顶的载荷逐渐从采空区顶板顶部转移到充填体顶部。“充填体-直接顶”结构提高了直接顶的自承载能力，控制了覆岩移动。随着开采深度的增加，逐渐趋近于原岩应力，对地表沉降的控制效果更加显著。最终确定“充填 3m 间隔 3m”为最优充填方案。在模拟充填开采过程中，煤壁前方应力集中区的峰值应力呈“增加-减少-增加”的趋势，采场中部直接顶的峰值应力曲线由“增加-减少”的趋势变为“增加-减少-增加-减少”的趋势。直接顶附近的岩层在煤壁两侧区域处于应力集中状态，中部不明显。
