【摘要】 为了深入研究在竖井爆破扩挖施工中不同延时时间对爆破效果的影响,总结分析现有相关研究后,综合考虑研究需要,相对全面地将延时时间设定为0、2、5、10、20、25、35 ms,通过控制变量法只考虑不同延时时间对于研究主体的影响规律。利用动力有限元分析软件LS-DYNA建立通风竖井延时爆破扩挖数值模拟模型,计算得出不同延时时间以及不同间隔距离对应的振速时程曲线、峰值振速以及结构失效情况,通过对计算结果的综合分析,从多个角度确定了针对所模拟的工况最佳的延时时间为25 ms,且得出了延时爆破不同延时时间对减振效果的一些实用性规律,对于类似工程延时爆破技术设计及参数优化具有一定的借鉴意义。更多还原

【Abstract】 In order to further study the influence of different delay time on shaft blasting excavation construction, on the basis of summarizing and analyzing relevant research, considering the research needs comprehensively, the delay time is relatively comprehensively set to 0、2、 5、10、20、25、35 ms, and only the influence of different delay time on the research subject is considered by the control variable method. The finite element analysis software LS-DYNA was used to establish the numerical simulation model of the blasting excavation of the ventilation shaft. The time history curve, the peak vibration velocity and the structural failure condition corresponding to different delay times and different separation distances were calculated. The comprehensive analysis of the results determines that the optimal blasting delay time for the working conditions simulated is 25 ms from several aspects, and some practical laws for the damping effect of different delay time of delay blasting are obtained. It has certain guidance and reference significance for the design of delay blasting technology and parameter optimization of related blasting engineering.更多还原