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毫秒延期爆破作为降低爆破震动效应的主要措施,已广泛应用于实际工程。但毫秒延期间隔时间多以经验或现场爆破试验给出,数值模拟方面所做研究较少。基于ANSYS/LS-DANY有限元软件的动力分析功能,建立了隧道三维爆破模型。简要分析了最大段药量对爆破震动效应的控制作用,在此基础上首次定量研究了不同的毫秒延期时间对隧道衬砌动力响应的影响;并结合质点震动速度安全判据,给出了合理的毫秒延期爆破时间。本文定量研究毫秒延期爆破间隔时间的方法及所采用的模型,可结合不同隧道的具体爆破条件修正后推广应用。
Demolition blasting in milliseconds as the main measure to reduce the blasting vibration effect has been widely used in practical engineering. However, the delay interval in milliseconds is mostly given by experience or field blasting tests, and few studies have been done in numerical simulation. Based on the dynamic analysis of ANSYS / LS-DANY finite element software, a three-dimensional tunnel blasting model is established. Based on the analysis of the effect of the maximum segment dose on the vibration effect of blasting vibration, the influence of different millisecond delay time on the dynamic response of the tunnel lining is quantitatively studied for the first time. Combined with the safety criterion of particle vibration velocity, a reasonable Millisecond delay blasting time. This paper quantitatively studies the method and the model used to delay the interval time of microsecond blasting, which can be used in combination with the specific blasting conditions of different tunnels.