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Numerical Simulation of hard roof processing step;

坚硬顶板处理步距的数值模拟

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

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

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。

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

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

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。

The control parameters of strata stress field in pre cracked top hard coal bed are researched using water fracturing under controlling of strata stress field, and the relationship between water seepage, expanding in occlude type of top coal crack and strata stress value is analyzed in this condition.

对坚硬顶煤预裂中存在的问题 ,采用在地应力场控制下水力压裂的方法 ,研究了煤层地应力场控制参数 。

The technology soften the mechanic property of top hard coal effectively.

该方法有效地软化了陈家山矿坚硬顶煤,煤块度明显下降,顶煤回收率提高了23%。