厚松散层矿区综放开采地表移动变形规律

Research on Surface Movement Law for Fully-mechanized Top Coal Caving Under Thick Unconsolidated Layers

以鑫龙煤矿首采工作面1501综放工作面地表移动观测数据为基础,研究了厚松散层地质采矿条件下综放开采对地表移动变形相关静态及动态参数的影响。结果表明:相较于一般采矿地质条件,在厚松散层下综放开采引起的地表下沉系数、水平移动系数及最大下沉速度系数偏大,分别为0.86、0.75和17.53;地表移动活跃期及衰退期较长,所占总移动时间的比值分别为58.0%和37.2%,阶段下沉量占总下沉量的比值分别为97.6%和2.0%,表明厚松散层下综放开采,地表将较长时间处于移动剧烈期且地表稳定所需时间较长。

On the basis of the surface movement observation data of 1501 working face in Xinlong Coal Mine, the influence of fully-mechanized top coal caving on the parameters of surface movement and deformation, surface correlation angle parameters and dynamic parameters are studied under the condition of thick unconsolidated layers. It was concluded that, compared to general mining geological conditions, the surface subsidence coefficient, horizontal movement coefficient and maximum coefficient of subsidence caused by fully mechanized caving mining are more larger under the thick unconsolidated layers, is 0.86, 0.75 and 17.53, respectively; the active stage and decline stage are longer, and the ratio of the total moving time is 58.0% and 37.2%, the ratio of the stage subsidence to the total subsidence is 97.6% and 2.0%. It shows that the surface will be in a long moving period, and the surface stability will take a long time under the mining of thick unconsolidated layers.