The undermine method of well drilling technology once of blasting is put forward as well as the calculation of blasting parameters and the demand of implementation for hole.
介绍了爆破一次成井技术在漂塘钨矿的应用实践，提出了爆破一次成井的掏槽方式，爆破参数的设计计算方法和炮孔的施工要求。
The implementation scheme, blasting design and technology which were applied to excavate the inverse-induced shaft of Yanshan Reservior Power Station are introduced in detail.
详细介绍了燕山水库电站反导井爆破开挖所采用的施工方案选择，钻爆设计及施工工艺等。
When implementing the smooth blasting in small-sectional roadway excavation under complex geologic conditions, the blasting parameters and the implementation technology have a certain particularity.
在复杂地质条件小断面巷道掘进中实施光面爆破，其爆破参数和施工工艺有一定的特殊性。
When implementing the smooth blasting in small-sectional roadway excavation under complex geologic conditions, the blasting parameters and the implementation technology have a certain particularity.
在复杂地质条件小断面巷道掘进中实施光面爆破，其爆破参数和施工工艺有一定的特殊性。
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