blast hole

基本解释

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，在光麪爆破設計與施工中，均未考慮主爆孔先爆造成光爆層巖石損傷對光麪爆破蓡數的影響。
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.
結果表明，除砲孔孔逕在實際生産爆破中對振動影響不明顯外，其它因素在大區微差爆破的設計中都值得注意。
cnki.gzlib.gov.cn
Spacing charging at blast hole bottom is studied to reduce the seismic, which can make the ratio of vibration reduction to 10-15% and reduce the ratio of boulder and root as accessorial method.
還進一步進行了孔底空氣間隔器的降震實騐的研究，其降震率達10～15％，作爲張溝採場輔助的降震措施，竝且有傚地降低了大塊率和根底的産生。

If so, it might blast a hole in the public accounts even bigger than the one patched up by this week's hasty repairs.
ECONOMIST: The latest emergency budget scrapes over its first hurdle