| 分幅减振爆破开挖技术实践 |
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| 作者单位： | ;1.西北矿冶研究院;2.招远黄金集团工业总公司;3.西北矿冶研究院 甘肃白银730900;4.山东招远265400 |
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| 摘 要： | 为解决在某石油储库顶部拱形岩巷施工过程中存在爆破振动过强、掏槽效果不佳、炮孔利用率不高、壁面成型不良且周边孔半孔率不足70%及围岩损伤过大等问题,提出"分幅减振爆破开挖技术"的解决方案,将断面化大为小,分次爆破,有效降低单次起爆药量和最大单段药量。采用复式楔形掏槽,周边孔光面爆破,毫秒延时起爆。现场试验表明,围岩峰值振速降为13.1 cm/s,爆破振动明显减弱,炮孔利用率高达90%以上,周边孔半孔率提高到85%,壁面成型良好,改进方案爆破效果良好。分幅减振爆破在大断面硬岩钻爆掘进中体现了良好的适用性,能够实现弱振动、高效率、大进尺开挖,满足地下水封石油洞库的特殊要求,可为类似岩石地下工程钻爆开挖提供借鉴与参考。
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| 关 键 词： | 特大断面隧洞 分幅爆破 减振 楔形掏槽 光面爆破 |
APPLICATION OF SPLIT TUBE IN CONTROLLED BLASTING FOR STOPING OF A SAFETY PILLAR |
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| Affiliation: | ,School of Resource and Civil Engineering, Northeastern University,Hongji Construction Engineering Co., Ltd. |
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| Abstract: | High effective SBP D split tube,a new explosive cartridge,is developed for controlled blasting The structure of SBP D split tube and its trial application in stoping of a safety pillar are introduced in this paper The practice has proved that the blasting effect can be obviously improved and the stability of surrounding rock ensured when this product is used It is a new explosive material being worthy of popularization |
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| Keywords: | Split tube Stope Controlled blasting Smooth blasting |
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