大采高综采工作面围岩活动特征研究

Research on Movement Characteristic of Surrounding Rock in Full-mechanized Mining Face with Large Mining Height

以某矿大采高工作面地质条件为背景,运用FLAC3D与3DEC数值模拟软件,研究了不同采高、不同工作面长度下工作面煤壁前方破坏面积以及上覆岩层活动范围的变化情况,结果认为:随着采高加大、工作面长度加长,煤壁前方破坏面积明显加大,易于发生煤壁片帮冒顶;顶板断裂线前移;随着采高的增加,岩层间离层量不断增加,顶板失稳时容易产生冲击载荷,支架要有较大的可缩性。

For geological condition of a colliery, this paper applied FLAC3D and 3DEC to researching coal failure area ahead of face and movement range of overlying rock under condition of different mining heights and face lengths. Results are as show. With increase of mining height and face length, failure area increases obviously and this will result in coal slide and roof fall. With increase of mining height, roof broken line advances and separation of strata increases. Roof instability is liable to form dynamic loading, so powered support needs larger yielding.