坝基基岩保护层开挖的一次爆破技术

本文分别论述了孔间微差爆破和炮孔底部柔性垫层的作用机理．经试验证明，采用孔间微差爆破及炮孔底部设置柔性垫层可有效地降低底部保留岩体的破坏影响，又能起到改善爆破效果的作用。

Research on One-Shot Blasting Method for Excavating Protective Layer of Dam Foundation

Mechanism of hole-to-hole millisecond delay blasting and behaviour of soft spacer at the bottom of boreholes are discussed.Through experiments it is proved that damage effect due to blasting on protective rock mass below the intended bottom can be reduced and blasting results improved by applying the hole-to-hole milli-secod delay blasting technique and setting soft spacer at the bottom of boreholes.