1) bundle-hole blasting
集束孔
1.
The complex technical problems of pillar group mining are solved by applying high efficiency block forced caving method with bundle-hole blasting and safety measure of flexible shockwave resistance wall,even ore drawing,and covering co.
本文分析了该矿柱群开采技术特点,针对性地采用高效率的集束孔阶段强制崩落技术,同时采取了柔性阻波墙、均匀放矿、地表覆盖等系统的安全控制措施,解决了复杂隐患区矿柱群回采技术难题,达到了根治火区隐患的目的。
2) bundle holes
集束炮孔
3) bundle drills
集束钻孔
1.
Based on analyzing the characteristics of ventilation system patterns and measuring the parameters of gas at coalfaces,the structure of three-dimensional "W" aerodynamic system is designed based on the theory of aerodynamics,which consists of U ventilation system,bundle drills and pumping roadways.
本文对已有工作面通风系统模式特点进行综合分析和现场通风瓦斯参数测定的基础上,应用空气动力学理论设计了高瓦斯高产工作面的“‘U 通风系统+集束钻孔+高抽巷”的立体“W”型空气动力学系统结构。
4) cluster down the hole hammer
集束潜孔锤
5) parallel bunch-long-hole
平行集束深孔
6) Concentrated parallel bunch blasthole blowing
密集平行束孔落矿
补充资料：第二孔(继发孔)型缺损
第二孔(继发孔)型缺损
ostium secondary defect
是心房间隔在形成上发生障碍，一般缺损较大，多在卵圆孔附近称第二孔(继发孔)型缺损。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条