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 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。
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.
还进一步进行了孔底空气间隔器的降震实验的研究，其降震率达10～15％，作为张沟采场辅助的降震措施，并且有效地降低了大块率和根底的产生。

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