At present, in the design and construction of smooth blasting, considering few influence that main blast hole 'first blast damage to rock of smooth blasting parameters.
目前，在光面爆破设计与施工中，均未考虑主爆孔先爆造成光爆层岩石损伤对光面爆破参数的影响。
The optimum design method and basic principles of main reducer of rotary blast hole drill are discussed, The main reducer is taken as a whole and is optimized by discrete Complex method.
论述了牙轮钻机主机构减速器的优化设计方法和基本原理，以主机构减速器作为整体进行优化，采用离散复合形算法。
The results show that the blast hole diameter has little effect of the vibration level in production blasting, and the other factors should be considered in large scale delay blast design.
结果表明，除炮孔孔径在实际生产爆破中对振动影响不明显外，其它因素在大区微差爆破的设计中都值得注意。
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