谢一矿51采区保护层开采卸压规律数值模拟研究

Study on Numerical Simulation of Pressure Released Law in Mining of Protective Seam in No. 51 Mining Block of Xieyi Mine

文章以淮南矿区谢一矿51采区地质条件和开采技术条件为背景,建立FLAC3D三维计算模型,深入系统地研究了B9b及B10保护层分别开采情况下,临近煤层应力分布规律。研究成果表明:①保护层开采情况下,被保护层工作面垂直应力SZZ可分为卸压区、增压区和稳压区;②B9b和B10作为下保护层分别开采条件下,对于上覆B11b被保护层工作面,深部卸压效果弱于浅部;B9b和B10作为上保护层分别开采条件下,深部卸压效果优于浅部;③B9b煤层和B10煤层作为下保护层分别开采,层间距对上覆煤层垂直应力的卸压效果影响不明显,但对增压区影响显著;④B9b煤层和B10煤层作为上保护层分别开采,层间距对下伏煤层垂直应力的卸压幅度和对增压区影响显著。

Based on the geological condition and the mining technology condition of No. 1 Mining Block in Huainan Mining Area as a background, a FLAG3D 3D computation model was established and applied to deep and systematically study the stress distribution law closed to the seam under the mining condition in No. B9b and No. B10 protective seams individually. The study achievements showed that 1 ） under the mining condition of the protective seam, the vertical stress of the coal mining face in the protected seam could be divided into a pressure released zone, a pressure increased zone and a pressure stabilized zone. 2 ） As under the individual mining condition of the No. B9b and No. B10 seams as the underneath protective seam, the deep depth pressure released effect would be lower than the shallow depth. As under the individual mining condition of No. Bgb and B10 seams as the upper protective seams, the deep depth pressure released effect would be better than shallow depth. As under the individual mining of No. B9b and No. B10 seams as the underneath protective seams, a spacing of the two seams would not have obvious influences to the pressure released effect of the vertical stress in the above seam, but would have obvious influences to the pressure increased zone. 4） As under the individual mining of No. B9b and No. B10 seams as the upper protective seams, a spacing of the two seams would have obvious influences to the pressure released range of the vertical stress in the underlying seam and the pressure increased zone and a small spacing would increase the pressure released effect, but the stress concentration coefficient of the pressure increased zone would be increased.