基于Matlab的山区急倾斜煤层开采沉陷预计系统

Prediction System for Mining Subsidence of Steeply Inclined Coal Seam Based on Matlab in Mountainous Area

为研究山区条件下急倾斜煤层开采对地表移动变形的影响,基于Matlab编程语言,将皮尔森Ⅲ型公式法与山区地表移动预计模型进行叠加,开发出了具有多项功能的开采沉陷预计系统,并对其适用性进行了验证。该系统的主要特点为,利用地表高程点对山区地表进行曲面二元多项式拟合,基于地表曲面函数有效解决了任意点倾斜方向角、倾角、地表特性系数、影响半径等重要参数的获取问题,减少了前期数据准备的工作量。将甘肃某矿区急倾斜煤层开采相关参数代入预计系统进行计算及绘图,并与实际观测值进行了对比分析。结果表明:在下沉值和走向移动值预计中,约有86.8%的点位所处区域的地表变形符合实测值的凹形发展趋势,可有效反映矿区变形特征;而在倾向移动值预计中不符合实测值的发展趋势,是因为系统的预计误差受到地表曲面拟合精度及矿区实际条件制约,应采用更精确的矿区参数进一步验证。该系统对于山区急倾斜煤层开采所引起的地表移动变形预计具有一定的参考价值。

In order to study the mining influence of steeply inclined coal seam on surface movement and deformation in mountainous area,based on the Matlab programming language,the Pearson III formula method is superimposed with the prediction model of mountain surface movement,so as to develop a prediction system with multiple functions.Subsequently,its applicability is verified.The main feature of the system includes that the surface bifurcation polynomial fitting is made on the surface of the mountainous area by using the elevation point of the surface.It is convenient to solve the problem of obtaining important parameters based on the surface function such as the direction angle of inclination,dip angle,surface characteristic coefficient and influence radius of any point,which reduces workload of preparing data.By calculating and plotting the parameters related to the steeply inclined coal seam mining in a mining area in Gansu Province,and comparing with the actual observations.The study results show that for prediction of the subsidence value and the strike movement value,86.8%of the points are in line with the measured values with concave development trend,and variation characteristics of surface deformation can be effectively described;however,for prediction of dip movement value,it is not consistent with the development trend of the measured values.It is analyzed that the reason for prediction error of the prediction system mainly comes from the surface fitting and the actual conditions of the mining area,which should be further verified by using more accurate mining area parameters.The system developed in this paper can provide certain reference for the prediction of surface movement and deformation caused by steeply inclined coal seam mining in mountainous area.