摘要
为了查明保德煤矿8#煤层坚硬顶煤内节理、裂隙的分布特征,及裂隙的变化和顶煤破坏随工作面推进的发展过程,在88203工作面前方布设两个观测孔（煤孔S1和煤孔S2）,采用LB钻孔数字摄像仪探测,记录节理、裂隙的发育、发展情况。观测结果表明：煤壁前方下位顶煤（0～2.19 m）的原生节理裂隙比较发育,上位顶煤（2.19～3.83 m）比较完整;采动超前支承压力超前作用距离10～13 m,产生压裂破坏和新裂隙。支承压力对顶煤具有一定的预裂功效,但效果不明显。
To make out the distributing character of joint and crack,chang of crack and breakage developing process of top coal with advancing of workface to hard top coal of coal seam No. 8 in Baode mine,two observation station were set up in front of workface 88203. Based on LB bore digital instrument of photo,we detected and noted the developing process of joint and crack. The result of observing demonstrated that crude joint and crack of lower top coal were much more developed than integrated upper top coal in front of coal wall ; the advance abutment pressure had effect on advance workface for 10m to 13m and brought about presplitting and new crack. Abutment pressure had the effect of presplitting,but not evident.
出处
《煤》
2007年第9期8-9,共2页
Coal
关键词
坚硬顶煤
裂隙
原生节理
LB数字摄像仪
hard top coal
crack
crude joint
LB digital instrument of photo
