激发态
地震波
爆炸物
振幅
电荷(物理)
物理
色散体波
领域(数学)
机械
原子物理学
光学
地球物理学
化学
数学
量子力学
有机化学
纯数学
作者
Qian Xu,Zhongqi Wang,Wengong Han,Chenglong Yu
出处
期刊:Geophysics
[Society of Exploration Geophysicists]
日期:2022-01-13
卷期号:: 1-60
标识
DOI:10.1190/geo2020-0260.1
摘要
The amplitude-frequency characteristic of a seismic wave excited by explosion sources directly affects the accuracy of seismic exploration. To reveal the effect law related to a cylindrical charge, the research proposes a seismic wavefield model excited by a long cylindrical charge. According to the characteristics of the blasting cavity generated by a finite length cylindrical charge, the seismic wavefield characteristics of a cylindrical charge excitation is obtained by superposing the seismic wavefield excited by a series of spherical charges. Numerical simulation results show that the calculation error of the blasting cavity characteristics of the theoretical model is within 10%. The comparison with field experimental results shows that the error of the model is within 9.4%. The velocity field of the excited seismic wave is almost the same as that of the spherical charge when the explosion distance to the cylindrical charge with finite length is 16-21 times longer than the charge length, but the frequency of the seismic wave is 30% higher than for a spherical charge. Moreover, the explosive velocity has a certain influence on the amplitude-frequency characteristic of the seismic wave excited by the cylindrical charge. The established theoretical model can accurately describe the amplitude-frequency characteristics of the seismic wavefield excited by a cylindrical charge with finite length.
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