大倾角特厚煤层开采地表沉降规律数值模拟研究

Numerical Simulation of Surface Subsidence Patterns in Large Inclination Extra-thickk Coal Seam Mining

为寻求大倾角煤层开采地表沉降规律,利用FLAC^(3D)数值模拟软件,对乌东煤矿煤层进行了沉降模拟,针对不同倾角条件下的地表沉降范围、地表沉降量进行了分析。并结合Excel软件分析了煤层倾角与开采沉降量之间相关性,建立了煤层倾角与煤层开采地表沉降量的线性回归方程,对煤层倾角和地表沉降量的关系进行验证。研究发现,煤层倾角是影响地表沉降量的重要因素。煤层倾角为35°、45°、55°和65°的煤层地表沉降最大值分别为1 039.9、495.44、234.42、118.56 mm,表明煤层倾角越小,随着开采层数的增加,地面沉降越明显。煤层倾角对矿区开采后地面沉降有显著影响。

In order to study the surface subsidence pattern of large inclination coal seam mining,the subsidence simulation of coal seam in Wudong coal mine was carried out by using FLAC^(3D) numerical simulation software. The surface subsidence range and the amount of surface subsidence were analyzed for different inclination conditions. The correlation between coal seam inclination and mining subsidence was also analyzed in conjunction with Excel software, and a linear regression equation between coal seam inclination and coal seam mining surface subsidence was established to verify the relationship between coal seam inclination and surface subsidence. It was found that the coal seam inclination angle is an important factor affecting the amount of surface subsidence. The maximum values of surface subsidence were 1 039.9 mm, 495.44 mm, 234.42 mm and 118.56 mm for coal seam inclination angles of 35°, 45°, 55° and 65° respectively, indicating that the smaller the coal seam inclination angle is, the more significant the surface subsidence is as the number of mined seams increases. The coal seam inclination angle has a significant effect on the ground settlement after mining.