切缝药包预裂爆破减振技术试验研究

发布时间：2019-02-12 08:14

【摘要】：针对城市地铁区间隧道施工掏槽眼爆破所致振速大之问题,通过在掏槽眼上方600 mm处横向布置5-7个预裂孔,采用不同药包进行预裂爆破形成裂缝及裂隙区,减少、阻碍掏槽眼爆破所致振动波向上传播,从而减小预裂孔本身爆破所致振速,使振速降低。研究结果表明,采用预裂爆破,拱顶上方质点Z向振速最大,侧向质点Y向振速最大;较在循环进尺、总装药量及炮眼数目基本不变情况下,采用5孔切缝药包预裂爆破降振效果最明显;侧向采用5孔普通药包预裂爆破降振效果最明显;切缝药包预裂爆破时随预裂孔总装药量的增加,拱顶及侧向爆破振动增强。施工中应综合考虑现场实际情况,选择合理的减振措施,实现安全高效施工。
[Abstract]:Aiming at the problem of large vibration velocity caused by cutting hole blasting in urban subway tunnel construction, 5-7 pre-cracking holes are arranged horizontally at 600 mm above the cutting hole, and different charge packs are used to pre-split blasting to form cracks and crack areas, which are reduced. The vibration wave caused by the cut hole blasting is prevented from propagating upward, thus reducing the vibration velocity caused by the blasting of the pre-split hole itself and reducing the vibration velocity. The results show that the Z direction vibration velocity of the particle above the arch roof is the largest and the lateral particle Y direction vibration velocity is the largest by pre-splitting blasting. Under the condition that the total charge and the number of holes are not changed, the effect of reducing vibration is most obvious by using 5 hole cutting seam charge pre-splitting blasting, and the effect of lateral conventional charge pre-splitting blasting is the most obvious. The vibration of the dome and lateral blasting increases with the increase of the total charge of the pre-cracked hole during the pre-splitting blasting. In order to realize safe and efficient construction, reasonable vibration reduction measures should be taken into account comprehensively.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金重点项目(51134025);国家自然科学基金面上项目(51274203,51374212)
【分类号】：U231;U455.6

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