2) hard roof
坚硬顶板
1.
Numerical Simulation of hard roof processing step;
坚硬顶板处理步距的数值模拟
2.
Numerical simulation of moving features of hard roof with three-dimensional discrete element method and nonlinear dynamic analysis;
坚硬顶板运动特征的数值模拟及非线性动力学分析
3.
Numerical simulation study with 3DEC on impacted movement of hard roof in manless working face extraction;
无人工作面开采坚硬顶板冲击运动的3DEC数值模拟研究
3) hard top coal
坚硬顶煤
1.
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.
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。
4) hard supporting-board
顶底板硬
5) hard top-coal
坚硬顶煤
1.
Study for macro-damage degree of weakening blast in hard top-coal;
坚硬顶煤弱化爆破的宏观损伤破坏程度研究
2.
Distribution characteristic of breaking extending area of weakening-blast in hard top-coal;
坚硬顶煤弱化爆破的破坏区分布特征
6) false-hard roof
伪硬顶
1.
The composition of the roof rock has a great influence on the stability of the roadway surrounding,especially for those roadway with the false-hard roof,which will be easily weathered or be weakened when encountering water.
不同顶板岩性组成对巷道围岩稳定性影响很大,特别是对遇水软化、风化程度高的伪硬顶板,必须区别对待。
补充资料：综采放顶煤
综采放顶煤：厚煤层煤炭开采技术之一。把原来分层开采的煤炭，一次采完。方法是，在煤层底部按传统方法开采，使上面的煤炭在矿压的作用下，自动落下来。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条