【摘要】 在微差爆破工程中,用干扰降震法实现爆破震动灾害主动控制的关键在于确定合理的微差延期时间。由于所使用的普通雷管存在延期误差,设计或选择的延期微差时间往往与实际的有较大出入,影响了微差爆破的效果和顺利实施。确定微差爆破中的实际微差延迟时间对优化微差爆破效果、降低爆破地震效应具有很大的现实意义。用基于小波分析的时能密度法以及信号时-频域转换技术,从实测微差爆破震动信号中分离出各分段震波,通过比较各分段震波在不同延期时间下的叠加效果,得到了微差爆破的较优微差延期时间,实现了爆破震动灾害主动控制。该方法对研究爆破震动效应及其灾害的控制,具有较高的理论和应用价值,为系统开展爆破震动危害控制和预测研究奠定了理论和技术基础。更多还原

【Abstract】 In millisecond blast engineering,the key to achieving initiative control of vibration damages by means of wave interference is to ascertain reasonable delay time interval.The designed or selected time of delay is always different from the practical time of delay due to the delay errors of ordinary detonators;and it influences the effect and successful implementation.It is significant to identify practical time of delay in millisecond blasting engineering.The authors have made use of time-energy density analysis based on wavelet transform and time-frequency domain transform techniques,and obtained the reasonable delay time interval by separating every sub-signal from measured millisecond blast vibration signal and comparing the superposition effect of sub-signal in different delay time intervals.The results show that the reasonable delay time interval is not generally a single value,but multi-time-intervals.The method proposed shows a high theoretical and practical value;and it lays a theoretical and technical foundation for the study of controlling and forecasting blast vibrational damages.更多还原