通过采用含空孔的直孔掏槽方式、反向起爆，并合理选择微差起爆时间，桩井爆破的平均炮孔利用率达到了90 %。
Through adopting the parallel cut and inverse initiation, and selecting correct delay-interval, an average blasting efficiency of 90% had been achieved.
文中通过一个成功的工程实例，初步探讨和总结了用爆破施工法拔出深井井管的方法、原理以及注意事项。
Through a successful Engineering example, this paper discussed and summarized the method, principle and attentive items for drawing out deep-well tubes by the construction technique of blasting.
许楼煤矿在主井人工冻结巨厚砾岩段施工中，采用了控制爆破技术。
A controlled blasting technology was applied to the construction of freezing thick gravel stratum section in the main shaft of Xulou Mine.
据此确定了与矿岩条件相匹配的炸药类型，得到了试验地段一次爆破成井试验的相关参数选取依据。
Based on this, the explosive type that matched the ore rock conditions was determined and the basis for selecting the related parameters of the test of shaft excavation by one blasting was obtained.
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 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.
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。
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.
从目前已有的研究状况来看，对盲天井深孔爆破一次成井的理论和试验研究还不多。
But till today, researches on completion of blind shafting in deep-hold blasting theory and experiment were not many.
采场切割井用中深孔一次爆破技术，采场周边及上盘则采用光面爆破技术，确保采场稳定。
One time blasting of deep and medium holes was applied for the cut through raise and smooth surface blasting was used for the stope periphery and upper wall to ensure the stope safety.
在防洪工程设施保护范围内，禁止进行爆破、井、石、土等危害防洪工程设施安全的活动。
Within the scope of protection of flood control works, exploding, drilling Wells, quarrying stones, collecting earth or other operations endangering the safety of flood control works are prohibited.
青印溪二级水电站用爆破膜代替调压井。
Safety membranes were used at Qingyinxi No. 2 water power station in lieu of surge chamber.
青印溪二级水电站用爆破膜代替调压井。
Safety membranes were used at Qingyinxi No. 2 water power station in lieu of surge chamber.
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