爆破地震波模拟研究

Numerical simulation of blasting seismic waves

从工程实际出发,基于非平稳随机过程模型,首先确定要模拟的爆破震动信号的功率谱并将其作为目标谱,在所需研究的爆破震动频率范围内产生一定数量的随机数来作为模拟爆破震动波的频率,在假设爆破震动信号是由不同频率的谐波函数合成的基础上,利用谐波函数叠加的方法合成需要模拟的爆破震动。根据提出的数学模型,编制了相应的计算程序,实现了爆破地震波的人工模拟。提出了模拟两点(微差)爆炸和多点(微差)爆炸产生的地震动时程的非平稳随机过程实用模型,模拟了两点(微差)爆炸和多点(微差)爆炸产生的爆破地震波时程特性。结果表明,模拟得到的爆破地震波时程能够很好地再现爆破地震波的特性。

Blasting seismic waves were numerically studied with a non - stationary random process model, an envelope function of acceleration amplitude and power density of explosion seismic waves were proposed, in which the effects of distance and mass of explosive were considered. The model parameters were determined by using the measured data. A practical simulation method of singler point, two-point （little difference） and multi-point （little difference） blasting seismic waves was also presented. Numerical simulation results show that the simulated history of blasting seismic waves can well reproduce some characteristics of blasting seismic waves.