blast hole

基本解釋

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面爆破參數(shù)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，除炮孔孔徑在實際生產(chǎn)爆破中對振動影響不明顯外，其它因素在大區(qū)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驗的研究，其降震率達10～15％，作為張溝采場輔助的降震措施，并且有效地降低了大塊率和根底的產(chǎn)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