自由面对爆破振动信号能量分布特征的影响

发布时间：2018-01-15 08:45

本文关键词：自由面对爆破振动信号能量分布特征的影响　出处：《爆炸与冲击》2017年06期 　论文类型：期刊论文

【摘要】：基于爆破振动实测数据,通过小波分析方法,得到不同数量自由面爆破振动信号的总能量、各频带的峰值质点振动速度(PPV)及各频带能量,进而对不同数量自由面爆破振动信号的能量分布特性进行研究。结果表明:开(掏)槽爆破,由于受单一自由面限制,大部分炸药爆炸的能量都将作为地震能量消耗掉;自由面越多,爆破振动信号总能量越少;自由面的数量可影响各频带振动分量分布,随自由面数量的增加,爆破振动能量更趋向高频分布,中低频能量有减少趋势,振动速度降低;同一振动信号中的高频带PPV虽比低频带PPV高,但振动持续时间短,能量衰减较快。建议在工程爆破的减振设计中,优化起爆方案,尽量利用多个自由面,这将比仅仅减少单段起爆药量更有效。
[Abstract]:Based on the measured data of blasting vibration, the total energy of different free surface blasting vibration signals, the peak particle vibration velocity of each frequency band and the energy of each frequency band are obtained by wavelet analysis method. The energy distribution characteristics of the vibration signals of different free surface blasting are studied. The results show that the blasting of slot is limited by a single free surface. Most of the explosive explosion energy will be consumed as earthquake energy; The more the free surface, the less the total energy of blasting vibration signal. The number of free surface can affect the distribution of vibration components in each frequency band. With the increase of free surface quantity, blasting vibration energy tends to high frequency distribution, middle and low frequency energy tends to decrease, and vibration velocity decreases. The high frequency band PPV in the same vibration signal is higher than the low frequency band PPV, but the vibration duration is short and the energy attenuation is fast. It is suggested to optimize the initiation scheme in the vibration reduction design of engineering blasting. Using as many free surfaces as possible will be more effective than just reducing the amount of detonation charge at a single stage.
【作者单位】：长沙理工大学土木与建筑学院;甘肃省交通规划勘察设计院股份有限公司;
【基金】：国家自然科学基金项目(51274049,51508038)
【分类号】：O38
【正文快照】： 工程爆破中自由面是爆源设计的重要参数之一,自由面的数量不仅影响爆破效果,还特别影响爆破振动效应。关于自由面状态及类型对爆破效果的影响均有研究[1-3],许多学者利用小波分析等手段研究了关于单段爆破与多段微差爆破振动信号的能量分布特征[4-16],其中除池恩安等[9]利用小

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