保德煤矿冲沟地形下综放开采地表沉陷规律研究

    Research on surface subsidence characteristics caused by comprehensive mining of gully terrain in Baode Coal Mine

    • 摘要: 针对保德煤矿综放开采易导致冲沟地形坡体裂缝异常发育甚至滑坡的现象,本文采用现场实测及数值模拟方法,研究了冲沟地形下高强度开采地表沉陷规律。研究结果表明:实测保德煤矿81306综放工作面采后的地表最大下沉量为3 158 mm,下沉系数为0.53,采动影响范围190 m,计算得出基岩裂缝角为83°,移动角为78°,边界角为68°,其开采扰动影响程度及范围比传统条件有明显增大。模拟研究发现,当冲沟地形处于开采边界的正上方时,其引起的开采沉陷会异常增大,主要原因是井下采动导致上覆沟谷坡体出现一定的滑动现象。基于此,本文针对性地提出了塌陷裂缝的治理措施,研究结果为冲沟地形建筑物下开采边界的合理选择及类似条件下的沉陷控制提供借鉴。

       

      Abstract: Aiming at the influence of mining in Baode Coal Mine on ecological environment and village relocation in gully terrain, it is considered to use on-site measurement and numerical simulation methods to study on the characteristics of surface subsidence caused by comprehensive mining in gully terrain.The results show that the measured maximum ground subsidence after mining at the 81306 working face is 3 158 mm, the sinking coefficient is 0.53, the mining influence range is 190 m, the fracture angle is 83°, the movement angle is 78°, the boundary angle is 68°, and the mining influence degree along with range are significantly larger than in traditional conditions.Combined with numerical simulation, it is found that the mining subsidence will increase abnormally when the gully terrain is directly above the mining boundary.The main reason is that the underground mining leads to a certain sliding phenomenon on the overlying gully slope.Based on that, the control measures of surface subsidence are proposed.The research results provide reference for the reasonable selection of mining boundary under constructions in gully terrain and the subsidence control under similar conditions.

       

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