摘要
为了解决钻孔爆破炮眼利用率低,装药量大等问题,结合多种机械动作堵塞结构的特点,应用膨胀技术的原理提出膨胀式堵塞结构,通过对堵塞结构进行力学分析,建立了最优膨胀角和最优堵塞长度计算模型。在摩擦系数为0.0028时,膨胀半锥角理论值为8°,在围岩、炸药、孔深一定的情况下,最优堵塞长度理论值为0.34 m,在经验值范围内。采用两种不同堵塞结构进行工业性试验,结果表明:膨胀式堵塞结构相对于粘土堵塞结构提高了炮孔的利用率,降低了用药量。膨胀式堵塞结构对堵塞结构的设计具有一定的指导意义。
In order to solve drilling blast problems such as low utilization rate of hole and big charge amount,the principle of expansion technology and stemming structure were d by combining with several kinds of mechanical ac- tion stemming structure characteristics. The stemming structure was discussed with mechanics behavior. Meanwhile, the optimal stemming length formula and the optimal expansion angle were established. On the condition with the fric- tion coefficient 0.0028, and the theoretical value of half cone expansion angle 8 degree,the theoretical optimal stem- ming length was obtained as 0.34 m. Two different stemming structures were taken into industrial test. the results show that, the expansion type stemming structure improved the utilization rate of blast hole, and reduced the explo- sives amount greatly.
出处
《爆破》
CSCD
北大核心
2017年第2期55-59,共5页
Blasting
基金
山西省科学技术发展计划(工业)项目(20140321003-05)
山西大同大学科学研究项目(2013K3)
山西大同大学校级科研项目(2016K11)
大同市基础研究计划项目(2017133)
关键词
堵塞结构
膨胀技术
膨胀角
堵塞长度
stemming structure
expansion technology
expansion angle
stemming length
