The stone that cannot be dug directly can use blasting operation.
机械不能直接开挖的石方采用爆破法开挖。
It is concluded that the rock mass structure has a not negligible influence when a quality threshold has to be set for a tunnel blasting operation;
研究表明，在必须为隧道爆破作业规定质量参数临界值时，岩体构造有不可忽视的影响。
It is mainly applied to blasting operation of general mining, tunneling, road-building, bridge-construction and building water conservancy projects.
主要用于一般采矿、开凿隧道、筑路修桥、兴建水利等爆破作业。
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