三软厚煤层综采工作面采动应力分布规律研究

Study on Mining Stress Distribution Law of Fully Mechanized Coal Mining Face in Thick Seam with Soft Roof,Soft Coal and Soft Floor

由于采动应力会导致煤层顶板垮断冒顶、巷道底鼓以及冲击矿压和煤与瓦斯突出发生,因此采用现场应力测试和数值模拟相结合的方法,研究了焦家寨煤矿三软厚煤层综采面采动应力分布规律,结果表明：距离工作面0—12 m为超前支承压力降低区、12—40 m为增高区、40 m以外为稳定区,应力集中系数为1.4-1.7;侧向支承压力在0—14 m形成应力降低区,在14—36 m形成应力增高区,36 m以外进入应力稳定区。

The mining stress would cause the roof and floor broken and failure,spalling and roof falling,floor heave of the seam and would cause the mine pressure bumping and the coal and gas outburst occurred.The site stress measurement and the numerical simulation combined method was applied to study the mining stress distribution law of the fully mechanized coal mining face in the seam with soft roof,soft coal and soft floor in Jiaojiazhai Coal Mine.The results showed that the pilot support pressure and stress reducing area was at a distance of 0—12 m in front of the coal mining face,the stress increased area was at a distance of 12—40 m in front of the coal mining face,the stress stable area was beyond 40 m in front of the coal mining face and the stress concentration coefficient was 1.4-1.7.There was a stress reduced area formed within a scope of 0—14 m of the lateral support pressure area,a stress increased area formed in the scope of 14—36 m and the stress sable area formed beyond 36 m.the analysis showed that the deformation and failure of the air return gateway in No.51109 coal mining face in Jiaojiazhai Mine was located under the lateral support pressure increased area formed by the above seam mining face.