Deep hole breast method 深孔矿房法
Millisecond delay technology of high step and deep hole is the first application in China, it offers a realistic method for high step exploitation of middle and small scale limestone mine.
高台段深孔孔内微差爆破技术在我国的首次应用，为中小型石灰石矿山高台段开采提供了切实可行的方法。
The method supplys grinding of deep blind hole a economic and reliable technology.
该方法为深盲孔的磨削加工提供了经济可靠的工艺方法。
The treatment of collapse body by deep hole grouting was described in detail. The construction method and the treatment measures were introduced.
本文就深孔注浆处理隧道塌方体进行了详细阐述，并对该项施工方法和处理措施作了介绍。
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