特厚煤层综放开采地表沉陷预计模型算法改进

近浅埋深特厚煤层综放开采因其一次性采出煤层厚度大,其地表移动变形特殊性较明显,该地质采矿条件下按概率积分法进行地表沉陷预计结果与实际情况有一定程度的偏差。对试验区近浅埋深特厚煤层综放开采条件下的地表移动变形特殊性进行了分析,考虑到厚硬岩层对地表沉陷的控制作用,并基于层状弹性梁板岩层沉陷控制理论和随机介质理论,建立适合近浅埋深特厚煤层综放开采沉陷预计模型。实践应用表明:该沉陷预计模型算法与实测结果吻合程度较好,适合于特厚煤层综放开采地表沉陷预计应用;较好地解决了概率积分法边界收敛迅速、盆地两侧不对称等问题,提高了地表沉陷的预计精度。

Improvement on prediction model algorithm for surface subsidence of extra thick seam using fully-mechanized top coal caving method

Because of the large mining thickness at one-time for extra thick seam using fully-mechanized top coal caving method and nearly shallow buried depth,the characteristics of surface movement and deformation particularity is obvious.Under this condition,its surface subsidence prediction has a certain degree of deviation with the actual situation.This paper analyzed the partic-ularity of surface movement and deformation for extra thick seam using fully-mechanized top coal caving method and nearly shallow buried depth of the test area.Considering thick-hard rock layer on surface subsidence control function,and based on layered elastic beam slab strata of subsidence control theory and random medium theory,the authors established a set of surface subsidence prediction model which is suitable for nearly shallow buried depth and extra thick seam using fully-mechanized top coal caving method.Practical application shows that degree of agreement for the prediction model algorithm with the experimental results is good,which is suitable for surface subsidence prediction application in extra thick seam mining using fully-mechanized top coal caving method.The prediction model algorithm preferably solved the problems such as rapid boundary convergence and unsymmetrical basin using probability integral method and improved the prediction accuracy of surface subsidence.