摘要
瑞雷面波在地球物理勘探和工业无损检测中起着重要的作用。自由界面激发的瑞雷面波有多个导波模式,瑞雷面波频散曲线特征可以清楚反映各层介质的力学参数。很多文献已经讨论了横向均匀层状固体介质中瑞雷面波的传播模式和特征,为了研究含层状液体介质自由界面瑞雷面波的传播特征,本文用传递矩阵法,结合位移应力的边界条件,推导出不同情况下含层状液体介质的瑞雷面波频散方程,频散函数表现为实数域的行列式,所以可用二分法求解,数值计算出三种不同情况下含层状液体介质模型的多模式瑞雷面波频散曲线,并对频散曲线的特征和影响因素作了简单分析,发现频散曲线可以清晰反映某些介质的层速度参数。
Rayleigh wave plays an important role in geophysical prospecting and industry nodestructive detecting. Many mode guide waves are produced in a free interface. So the character of Rayleigh wave dispersive curves can reflect the strata mechanics parameters. In order to study the Rayleigh character of landscape orientation uniformity liquid strata mediums, with transfer matrix method and combined with displacement and stress verge conditions, Rayleigh wave dispersive equations in different conditions of including layered medium are inferred. The dispersive equation is real number. With dichotomy method, three kinds of high mode dispersive cursives in the conditions of liquid strata model are computed. Then the effects and characters of Rayle.igh discursive cursives are analyzed and find dispersive curve can reflect the parameter of strata velocity.
出处
《工程地球物理学报》
2005年第3期202-207,共6页
Chinese Journal of Engineering Geophysics
关键词
液体层状介质
多模式
瑞雷面波
频散曲线
liquid layered medium
high mode
Rayleigh wave
dispersive curve
