顶煤深孔预裂爆破技术在提高巨厚煤层回采率中的应用

Application of Recovery Rate on Top- coal Deep Hole Pre- splitting Blasting Technology in Improving Thick Coal Seam

兖矿新疆矿业有限公司硫磺沟煤矿回采的9～15号煤层平均厚度达34．11m，属巨厚煤层，采用综采放顶煤采煤法回采。在回采过程中因煤体硬度大、节理裂隙不发育，使顶煤冒落困难，顶煤回收率低。针对这一问题，该矿采取了在工作面上下巷中间布置专用工艺巷对顶煤进行深孔预裂爆破，以弱化煤体硬度和增加其裂隙，改善了顶煤的冒放性，提高了工作面的采出率，实现了高产高效。

Yankuang mining Co., Ltd., xinjiang LiuHuangGou 9 ～15 of the coal mining coal seam is 34.11 m thick, on average, the thick coal seam, the mining method of extraction of fully mechanized caving coal face. In the process of extraction for coal hardness, joint fissure development, make the hard top - coal caving, top - coal recovery rate is low. In order to solve this problem, the mine a- dopted in working face layout between up and down which specialized technique lane to deep hole pre - splitting blasting of top - coal, to weaken the hardness and increase its cracks, improved in roof caving in top - coal, Raise the extraction rate of working face, realized the high production and efficiency.