极近距离薄煤层同采工作面覆岩移动规律研究

Overlying Strata Movement Law of Ultra-Close Thin Coal Seam Adopting Simultaneous Mining Face

应用FLAC3D建立数值力学模型,通过研究极近距离薄煤层同采时,在上、下层工作面不同错距时,工作面覆岩位移场、塑性区及应力场的变化,并揭示其应力传递规律,并结合现场工业试验,得出合理的同采工作面错距公式.利用这一规律进行现场工程实践,取得了较好的技术经济效果.结果表明:运用建立数值力学模型及现场工业试验相结合的方法来解决极近距离薄煤层同采问题,较传统方法更可靠、更有效.数值模拟分析及工业试验相结合的方法在处理极近距离煤层开采时,值得进一步探讨和应用.

Using the numerical mechanics model established by FLAC3D,we study the changing law of the overlying rock displacement,plastic zone,and stress field when ultra-close thin coal seams are mined simultaneously when the staggered distance between higher working face to lower working face is different.The reasonable staggered distance formula in simultaneously mining face is obtained by site commercial test in combination with the stress transferring rule revealed.The law was applied in the in-site engineering p...