花岗岩介质中地下爆炸震源函数研究
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摘要
结合地震反演方法和数值计算方法,研究了地下爆炸震源函数的特征以及介质特性对震源函数的影响。从水饱和花岗岩地下爆炸波数值模拟计算出发,重点分析了含水量对震源函数特性的影响。结果表明,含水量会提高地下爆炸的耦合强度,对于震源函数的稳态值,干岩要比水饱和岩石低,且稳态值随含水量的增大而增大;拐角频率随含水量的增大而降低;在水饱和花岗岩中,震源函数的高频衰减指数高于f-2;而过冲特性并不明显。
The main characteristics of seismic source function in underground explosion are studied by seismological method and numerical method. Especially, the influence of water content on seismic source function is studied, and it reveals that the coupling energy of underground explosion increases with the increase of the water content. The steady-state value of RDP in water-saturated granite is higher than that in dry granite, and correspondingly, the value increases with the increase of water content. However, the corner frequency of RVP’s amplitude spectrum of water-saturated granite is lower than that in dry granite, and its value decreases with the increase of water content. The asymptotic behavior of RVP at high frequencies, or roll-off, is thought to be steeper than f~ -2 . The overshoot of RDP at the far-field is not obvious.
The main characteristics of seismic source function in underground explosion are studied by seismological method and numerical method. Especially, the influence of water content on seismic source function is studied, and it reveals that the coupling energy of underground explosion increases with the increase of the water content. The steady-state value of RDP in water-saturated granite is higher than that in dry granite, and correspondingly, the value increases with the increase of water content. However, the corner frequency of RVP’s amplitude spectrum of water-saturated granite is lower than that in dry granite, and its value decreases with the increase of water content. The asymptotic behavior of RVP at high frequencies, or roll-off, is thought to be steeper than f~ -2 . The overshoot of RDP at the far-field is not obvious.
引文
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[5]周钟,王肖钧,赵凯,等.水饱和岩石中爆炸应力波传播的数值模拟[J].爆炸与冲击,2005,25(4):296-302.ZHOU Zhong,WANG Xiao-jun,ZHAO Kai,et al.Numerical si mulation for blast wave in water-saturated rock[J].Explosion and Shock Waves,2005,25(4):296-302.
[6]Mueller R A,Murphy J R.Seismic characteristics of underground nuclear detonations,Part I.Seismic spectrum scaling[J].Bulletin of the Seismological Society of America,1971,61:1675-1692.
[7]Murphy J R,Mueller R A.Seismic characteristics of underground nuclear detonations,Part II.Elastic energy and magnitude determinations[J].Bulletin of the Seismological Society of America,1971,61:1693-1704.
[8]Murphy J R.Free-field seismic observations from underground nuclear explosions[C]∥Taylor S R,Patton HJ,Richards P G,et al.Explosion Source Phenomenology,Geophysical Monograph65,AGU,Washington DC,1991.
[9]Larson D B.Explosive-induced wave propagationin nugget sand-stone[J].Journal of Geophysical Research,1984,89:9415-9424.
[10]Larson D B.Seismic coupling of nuclear explosions[R].UCRL-21086,1993.
[2]Denny MD,Johnson L R.The explosion seismic source function:Models and scalinglaws reviewed[C]∥Taylor S R,Patton HJ,Richards P G,et al.Explosion Source Phenomenology,Geophysical Monograph65,AGU,Wash-ington DC,1991.
[3]李孝兰.空腔解耦爆炸实验研究的基础理论(I)[J].爆炸与冲击,2000,20(2):186-192.LI Xiao-lan.Basic theory of decoupled explosions in cavities(I)[J].Explosion and Shock Waves,2000,20(2):186-192.
[4]李孝兰.空腔解耦爆炸实验研究的基础理论(II)[J].爆炸与冲击,2000,20(3):283-288.LI Xiao-lan.Basic theory of decoupled explosions in cavities(II)[J].Explosion and Shock Waves,2000,20(3):283-288.
[5]周钟,王肖钧,赵凯,等.水饱和岩石中爆炸应力波传播的数值模拟[J].爆炸与冲击,2005,25(4):296-302.ZHOU Zhong,WANG Xiao-jun,ZHAO Kai,et al.Numerical si mulation for blast wave in water-saturated rock[J].Explosion and Shock Waves,2005,25(4):296-302.
[6]Mueller R A,Murphy J R.Seismic characteristics of underground nuclear detonations,Part I.Seismic spectrum scaling[J].Bulletin of the Seismological Society of America,1971,61:1675-1692.
[7]Murphy J R,Mueller R A.Seismic characteristics of underground nuclear detonations,Part II.Elastic energy and magnitude determinations[J].Bulletin of the Seismological Society of America,1971,61:1693-1704.
[8]Murphy J R.Free-field seismic observations from underground nuclear explosions[C]∥Taylor S R,Patton HJ,Richards P G,et al.Explosion Source Phenomenology,Geophysical Monograph65,AGU,Washington DC,1991.
[9]Larson D B.Explosive-induced wave propagationin nugget sand-stone[J].Journal of Geophysical Research,1984,89:9415-9424.
[10]Larson D B.Seismic coupling of nuclear explosions[R].UCRL-21086,1993.
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