综放开采大放高坚硬顶煤预先弱化方法研究

Study of pre-weakened method on the hard thick-top-coal in fully mechanized caving

在对坚硬特厚煤层综放开采顶煤破坏基本特征及影响顶煤破碎冒放主要因素分析的基础上 ,提出了综放开采大放高坚硬顶煤深孔爆破和爆后破坏区动压注水预先综合弱化方法 ,建立了预先弱化作用力学模型 ,分析了预先综合弱化作用基本规律及主要参数的确定方法 .结合靖远矿务局红会一矿的具体条件 。

Based on analyzing the top coal destroying basic characters as well as the main influencing factors on the top coal fracturing and falling in fully mechanized caving of the hard extra thickness coal seam, the method synthetically pre weakened hard thick top coal with the deep bore blasting and dynamic pressure water injecting into coal body of the blasted area is put forward, the pre weakened mechanics model is set up, the pre weakened basic laws and the determining way of its main parameters are researched. An example applied actually in Jingyuan, Honghui Coal Mine No 1 is given out according to the concrete conditions.