急倾斜煤层开采地表下沉预计修正模型

Prediction Correction Model of Surface Ground Subsidence Above Steep Inclined Seam Mining

为了研究概率积分法对于急倾斜煤层开采沉陷预计的适宜性问题,采用了相似材料模型模拟的研究方法,通过Matlab非线性最小二乘拟合法,发现拟合求取的部分地表移动参数不符其原来的物理意义。鉴于此,提出了基于概率积分法的地表下沉预计修正模型,分析了该模型的修正效果,求出了其修正参数。研究结果表明:当煤层倾角50～70°时,该模型下沉拟合精度达到2%以下,并得到了其修正参数与煤层倾角之间的表达式;当煤层倾角大于70°时,该模型不适用。

In order to study the suitability of the probability integral method applied to the mining subsidence estimation of a steep inclined seam, a simulation study method of the similar material model was applied. With the nonlinear least square fitting method of Matlab, the results showed that partial surface ground moving parameters obtained from the fitting could not meet the original physical meaning. Thus a surface ground subsidence estimation correction model was provided based on the probability integral method. The correction effect of the model was analyzed and the correction parameters were obtained. The study results showed that when the seam angle was 50 - 70°, the subsidence fitting accuracy of the model would be less than 2% and the expression between the correction parameter and the seam inclina- tion could be obtained. When the seam angle was over 70°, the model would not be suitable.