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Tunnel millisecond-delay controlled blasting based on the delay time calculation method and digital electronic detonators to reduce structure vibration effects

机译：基于延迟时间计算方法的隧道毫秒延迟控制爆破和数字电子雷管以减少结构振动效应

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摘要

The reasonable delay time of millisecond-delay blasting using digital electronic detonators can significantly reduce the vibration effects induced by tunnel blasting. This study proposes a method for calculating the delay time for cut holes, easer holes and periphery holes, considering the rocks breaking effect as well as wave superposition theory. And then according to the actual layout diagram of the tunnel holes, the delay time calculation formulas of different holes are put forward. Then the delay times were calculated according to the formulas and applied in the field tests. The velocities, rocks breaking and wave superposition cancellation of the vibration using different delay times are analyzed with digital electronic detonators. Then the optimum delay times of different holes were obtained and applied to New Hongyan tunnel project. The velocity and frequency of the vibration with digital electronic detonators are analyzed, compared with non-electronic detonators. The effects of charge and delay time on the velocity and principal frequency of a blasting seismic wave are discussed. The results indicate that the delay time for the holes must be prioritized to achieve breaking effects in the rock with the simultaneous formation of a new free surface, next considering the wave superposition cancellation. When the delay time of cut holes was 5 ms, the rocks breaking effect and wave superposition cancellation effect both worked well. The velocity of the vibration induced by the cut holes blasting was about only 0.46–0.51 cm/s. When the delay time was 6 ms or much longer, the rocks breaking effect would fail. With regard to the easer holes and periphery holes, the optimum delay time of them were all 5ms. The vertical peak particle velocity was reduced from 2.974 cm/s to 0.901 cm/s with digital electronic detonators. Therefore, the velocity had decreased by 69.70% than non-electronic detonators, which was caused by reducing the single simultaneous explosive charge and setting optimum delay time. The proposed delay time calculation method is demonstrated to be sufficiently accurate and can thus be used as a guideline to reduce tunnel blasting vibrations.
机译：使用数字电子雷管的毫秒级延迟爆破的合理延迟时间可以显着降低隧道爆破引起的振动影响。这项研究提出了一种方法，该方法考虑了岩石破裂的影响以及波浪叠加理论，用于计算切孔，缓和孔和外围孔的延迟时间。然后根据隧道孔的实际布置图，提出了不同孔的延迟时间计算公式。然后根据公式计算出延迟时间，并将其应用于现场测试。使用数字电子雷管分析了使用不同延迟时间的速度，碎石和波的叠加消除。然后获得不同孔的最佳延迟时间，并将其应用于新红岩隧道工程。与非电子雷管相比，分析了数字电子雷管的振动速度和频率。讨论了装药和延迟时间对爆破地震波的速度和主频率的影响。结果表明，必须优先考虑孔的延迟时间，以在岩石中同时产生新的自由表面的情况下达到破碎效果，然后再考虑波浪叠加抵消。当切孔的延迟时间为5 ms时，碎石效果和波浪叠加抵消效果都很好。切孔爆破引起的振动速度仅为0.46-0.51 cm / s。当延迟时间为6 ms或更长时，碎石效果将失效。对于安放孔和外围孔，它们的最佳延迟时间均为5ms。使用数字电子雷管，垂直峰值粒子速度从2.974 cm / s降低到0.901 cm / s。因此，速度比非电子雷管降低了69.70％，这是由于减少了同时爆炸的一次装药和设置了最佳延迟时间所致。所提出的延迟时间计算方法被证明是足够准确的，因此可以用作减少隧道爆破振动的指导。

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  • 期刊名称 other
  • 作者

    Xiaoming Guan; Caixia Guo; Ben Mou; Leilei Shi;

  • 作者单位
  • 年(卷),期 -1(14),3
  • 年度 -1
  • 页码 e0212745
  • 总页数 25
  • 原文格式 PDF
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  • 入库时间 2022-08-21 11:06:00

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