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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。
The existing “three under” coal mining regulations stipulate the boundary angle of 10 mm as the boundary point to determine the boundary angle of the surface movement basin and indicate the boundary angle value of 50 ° ~ 65 ° according to different types of overburden. However, the measured data of surface subsidence and the mining damage in the mining area show that the method of determining the current boundary angle and the size of the angle can not meet the needs of the mine engineering. The authors put forward that the thick loose seam mining area moves horizontally by 10 mm As the boundary point to determine the boundary angle, the boundary value of the rules in accordance with the provisions of the regulations to reduce the 5 ° ~ 10 ° and other amendments to the safe and efficient production of mines with guiding significance and practical value.