马脊梁矿河床及采空区下煤层安全开采研究

Study on safe mining of coal seam in riverbed and goaf in Majiliang Coal Mine

以晋能控股煤业集团马脊梁矿为研究对象,针对河床及采空区共同影响下,石炭系煤层安全开采问题,采用现场踏勘方式查明了地表径流形态、周期性水量变化情况;采用物探手段初步圈定了上层侏罗系采空区积水区域,并采用钻探进行了验证;根据岩移角临界值及空间分布特征计算出了石炭系煤层开采断裂带高度数值;综合物探、断裂带分布、煤厚变化和顶板特征,划定了石炭系8117工作面分区开采高度。结果表明:侏罗系煤层采空区局部沟通地表径流,且在中部存在积水区;石炭系煤层开采断裂带未扩展至侏罗系煤层采空区。

Taking Majiliang Mine of Jineng Holding Coal Industry Group as the example, aiming at the problem of safe mining of Carboniferous coal seam under the integrated influence of riverbed and goaf, by means of field survey, geophysical exploration and drilling, the surface runoff morphology and periodic water change were analyzed, and the geophysical anomaly areas of upper Jurassic coal seam were delineated;according to the critical value of rock movement angle and spatial distribution characteristics,the height value of fracture zone in Carboniferous coal seam mining is solved, and the partition mining height of working face in Carboniferous coal seam is determined by comprehensive geophysical prospecting, fracture zone distribution, coal thickness variation and roof characteristics. The results show that: Jurassic coal seam goaf is filled by the surface runoff locally, and there is a water accumulation area in the middle. It is concluded that Carboniferous coal seam mining fracture zone does not extend to Jurassic coal seam goaf.