深孔爆破预压裂技术在综放开采坚硬顶煤中的应用

Application of deep hole blast pre-fracture technology in hard top coal fully mechanized mining

陕西火石咀矿煤矿有限责任公司4号煤,煤层厚度较大,顶煤及老顶硬度较大,采用放顶煤开采的过程中表现出顶煤冒落滞后、大块煤堵塞放煤口、周期来压能量的特点,严重影响了工作面煤炭的采出率和威胁了工作面回采的安全性。特此针对8501工作面的爆破进行了改进,提出"深孔爆破预压裂技术",通过开采实践证明,该种技术效果较以往明显,并取得了良好的经济和社会效益,在类似条件下可以进行推广应用。

No. 4 coal seam with large thickness and hardness of roof coal in Shaanxi Huoshiju Mine, delayed top coal caving, large coal block plugging caving position, periodical pressure energy appear as adopting top coal caving mining,which affect the mining rate and the safety of recovery mining. Deep hole blast pre-fracture technology was adopted in 8501 working face, the practice showed that the technology was effective, with good economic and social benefit and promotion value.