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 delayblast 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。
2
The reasonable delay time of blast in the iron mine has been discussed tentatively with the gray-scale map invented by Anderson d.
用安德逊的灰度图对该矿爆破的合理微差时间作了初步探讨。
3
This paper systematically described the test and application of millisecond delay detonation technique in blast-Winning face of very thin seal in Xiehe Coal Mine.