村庄下厚煤层综合机械化矸石充填开采地表沉陷与变形分析

Analysis of Surface Subsidence and Deformation of Thick Mechanized Coal Gangue Filling Mining Under Village

为解放村庄下浅埋厚煤层资源,延长矿井服务年限,同时保证地面建筑物的安全使用,需开展浅埋厚煤层综合机械化矸石充填开采控制地表沉陷变形研究。以潞安集团王庄煤矿52采区5201工作面为例,首先对该矿井矸石进行了一系列级配试验,以提高矸石充填体的充实率;然后根据综合机械化矸石充填开采工艺设计了3种充实率控制方案,同时基于等价采高开采沉陷预计分析得出3种充实率控制方案的地表移动与变形值;最后依据地面建筑物损坏等级、矸石充填量以及充填工艺等因素综合确定了最佳充实率控制方案。研究表明:该方案实施不但能确保地面建筑物的安全使用,同时还节约了矸石充填材料。

In order to liberate the resources of shallow and thick coal seams under villages,prolong the service life of mines,and ensure the safe use of surface buildings,it is necessary to carry out the study on controlling surface subsidence deformation by comprehensive mechanized gangue filling mining in shallow and thick coal seams.In this paper,5201 working face of 52 mining area in Wangzhuang Coal Mine of Lu’an Group is selected as the experimental working face.First,a series of gradation tests are carried out to improve the filling rate of waste rock,then three filling rate control schemes are designed according to the comprehensive mechanized waste rock filling mining technology,and at the same time,the mining subsidence is based on the equivalent mining height.It is predicted that the surface movement and deformation values of the three kinds of filling rate control schemes can be obtained.Finally,the optimum filling rate control scheme can be determined according to the damage grade of the surface buildings,the amount of waste filling and the filling technology.The study shows that the scheme can not only ensure the safe use of surface buildings,but also save the waste filling materials.