黄金科学技术 ›› 2023, Vol. 31 ›› Issue (6): 944-952.doi: 10.11872/j.issn.1005-2518.2023.06.053
甘会莲1(),蒋新闻1,陈志伟1,乔永昕1,陈淑华1,王建国2()
Huilian GAN1(),Xinwen JIANG1,Zhiwei CHEN1,Yongxin QIAO1,Shuhua CHEN1,Jianguo WANG2()
摘要:
针对传统光面爆破技术在隧道Ⅳ级和Ⅴ级软弱围岩中应用时常出现的超挖和进尺率低等问题,基于聚能水压光面爆破技术的原理及应用现状,设计了一种轴向多孔聚能管,通过将管内水袋、药卷交替间隔搭配导爆索和数码电子雷管形成一体化聚能水压装药结构,并在云南勐省隧道Ⅳ级围岩区域开展了连续装药光面爆破、水袋间隔光面爆破、空气间隔光面爆破和聚能水压光面爆破4种试验。爆后使用测距仪、卷尺和标杆对循环进尺、半孔率和超欠挖等爆破技术指标进行测量。试验结果表明:前3种试验的半孔率依次为13%、45%和38%,一个循环进尺依次为3.40 m、3.50 m和3.45 m,轮廓面围岩破碎存在超欠挖现象,而采用一体化装药结构的聚能水压光面爆破后的半孔率达62%,一个循环进尺为3.60 m,试验区域轮廓线比较平整,没有明显的超欠挖现象。现场应用结果表明:新型一体化聚能水压爆破在软弱围岩隧道周边轮廓平整度控制中效果显著,在减少钻孔数量和炸药量的同时,保持了围岩的完整性,是一种环保、节能的控制爆破技术。
中图分类号:
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