厚松散层下矸石充填开采地表移动规律研究

摘要

In order to analyze the surface ground movement law of coal rejects backfill mining under thick and loose overburden strata,the FLAC3D numerical simulation software with orthogonal and uniform designed test to calibrate the mechanics parameters of indoor rock samples was applied to individually establish and calculate numerical model of the coal rejects backfill mining under the different thickness of the thick and loose overburden strata. Under the conditions of the same base rock thickness and different loose strata thickness and under the conditions of same mining depth and different loose strata thickness, the study on the surface ground movement law of the coal rejects backfill mining showed that,firstly,under the conditions of the same base rock thickness,with the loose strata thickness increased,the max subsidence value of the surface ground above the coal rejects backfill mining, the max horizontal movement value and the tangent value of main effect angle would be increased.Secondly ,the surface ground subsidence coefficient of the backfill mining under the thick and loose o-verburden strata would be increased in linear with the rate of the loose strata thickness and the mining depth. Finally, the mining depth would be the major factor affected to the surface ground movement scope of the coal rejects backfill mining under the thick and loose overburden strata and the thick and loose overburden strata would be less affected to the surface ground movement scope.%为分析厚松散层下矸石充填开采地表移动规律,采用FLAC3D数值模拟软件,利用正交均匀设计试验校正室内岩样力学参数,分别建立不同松散层厚度条件下矸石充填开采数值计算模型.通过对相同基岩层厚度、不同松散层厚度条件下与相同采深、不同松散层厚度条件下矸石充填开采地表移动规律的研究得出:①在相同基岩层厚度的条件下,随着松散层厚度的增大,矸石充填开采地表最大下沉量、最大水平移动以及主要影响角正切均增大；②厚松散层下充填开采地表下沉系数随松散层厚度与采深之比呈线性递增；③采深是厚松散层下矸石充填开采地表移动范围的主要影响因素,而松散层厚度对地表移动范围的影响较小.