基于充实率的矸石充填开采地表移动数值模拟

Numerical Simulation on Ground Movement of Gangue Backfill Mining Based on Filling Percentage

为了研究矸石充填开采在不同充实率条件下的地表移动变形规律,采用FLAC3D数值模拟软件建立某矿区不同充填强度下的矸石充填开采数值计算模型,分析不同的充实率对地表沉陷的影响规律,并在此基础上结合等价采高理论对比分析了薄煤层垮落法开采与矸石充填开采地表移动结果,得出两者地表最大移动量的差值随充实率的变化特征,研究表明:矸石充填开采充实率越高,地表沉陷的控制效果越好,地表移动与变形极值均随充实率的增加而呈线性减小;基于等价采高的矸石充填开采预计是偏于保守和安全的,且随着充实率的增大,等效薄煤层与充填开采地表移动极值逐步接近,相对偏差逐渐减小。

In order to study the ground movement and deformation laws under different filling percentages of gangue backfill mining,a FLAC3 Dnumerical simulation software is applied to establish numerical models of backfill mining under different filling intensity based on a coal mine respectively. Through analyzing the influence of different filling percentages of gangue backfill on ground subsidence,it is obtained that with the increase of filling percentage,the better the effect of controlling surface subsidence is,the ground movement and deformation extremum value is associated with filling percentage change of linear relation; then combined with the equivalent mining height theory,the ground movement results are compared between caving mining of thin seam and gangue backfill mining,and the difference with the variation of filling percentage between the both maximum amount of movement were given.