厚松散层矿区地表移动盆地边界角确定方法

现行的"三下"采煤规程规定以下沉10 mm作为边界点来确定地表移动盆地的边界角,并根据不同覆岩类型指出边界角值为50°～65°。但厚松散层矿区地表沉陷实测资料和矿区采动损害实例表明,现行边界角确定方法及角值大小不能很好满足矿山工程需要,提出了厚松散层矿区以地表移动盆地边缘处水平移动10 mm作为边界点来确定边界角,边界角值在规程规定的基础上减少5°～10°等修改建议,对矿山安全高效生产具有指导意义和实用价值。

Determination Method of Boundary Angle of Ground Subsidence Basin in Thick Unconsolidated Mining Area

The current " three under " mining rule regulates that the boundary angle of ground subsidence basin is determined by taking subsidence of 10 mm as boundary points,and the boundary angle is from 50 ° to 65 ° according to different overburden rock types.Surface subsidence measured data of thick unconsolidated layer mine and mining-induced damage example show that the existing method and the size of the angle value for determining the boundary angle are not very well to meet the needs of mining engineering.Amendment suggestion is put forward to determine the boundary angle by taking the horizontal subsidence of 10mm near the boundary zone of ground subsidence basin as boundary points in thick unconsolidated mining area,and the boundary angle value reduces 5 ° to 10 °on the basis of the current regulation.The suggestion has guiding significance and practical value to the efficient and safety production of the mine.