A Physical Research Of Two Dimensional Simulation Characteristics Of Rayleigh Wave In Lateral Inhomogeneous Medium

Nowadays,the research of surface wave theory of domestic and foreign scholars in Rayleigh homogeneous and layered inhomogeneous media have achieved remarkable results,but in practice,due to the lack of theoretical modeling and analytical solutions and other difficulties,research on Rayleigh wave for inhomogeneous media is relatively small,but the lack of system simulation study the physics.This paper uses the two-dimensional physical simulation for inhomogeneous media,launched research on physical simulation.The main contents are as follows:(1)The design of two-dimensional physical model observation system.Firstly,from the characteristics of ultrasonic and ultrasonic transducer,with the ultrasonic physical simulation theory,the two-dimensional physical model is established based on the simplified.Through the establishment of uniform and non-uniform(holes of different deep buried organic glass)model,the author choose suitable transducers,experimental methods and data processing procedure design.(2)Vector Rayleigh wave in transverse uniform and Simulation of velocity dispersion in homogeneous medium.Two methods of the sound and the electric observation were carried out experiments to simulate the two-dimensional physical deep buried holes of different,the existence and influence of the hole depth hole scale generated wave propagation on multi component Rayleigh surface and compared to the same physical simulation experiment conditions and electric sound recording.(3)The lateral inhomogeneous medium vector Rayleigh wave polarization ellipticity dispersion simulation.In this paper,using the vector data signal sound experiment data of elliptical polarization,spectral ratio method can be calculated the local anomaly using the H/V rate,then studied the Rayleigh wave dispersion characteristics of elliptical polarization.Through the above research,the research conclusions are as follows:(1)The two-dimensional physical model simulates model with modeling,low cost,strong signal,low boundary effect.Through the sound and the electric observation system to carry out the physical simulation,the results show that with the increasing of the hole depth,the hole center frequency shifts toward the lower frequency and energy gradually weakened,which weakened the role of the high frequency component of Rayleigh wave is more obvious.And the acoustic effect has certain feasibility in the application of Rayleigh wave exploration,a sound effect,acoustic effect has more advantages.(2)Rayleigh wave elliptical polarization dispersion and dispersion can be used for the detection of transverse inhomogeneous media.For the detection of single local anomalous body,the way is ignoring the error of rational location of anomalous body,elliptical polarization dispersion profile can show the approximate circular anomaly.The velocity dispersion requires a longer arrangement and the signal is mainly concentrated in the near frequency.Therefore,the elliptic polarization has better sensitivity,convenient observation,which is not subject to site constraints,and it is better than the degree of recognition of the medium contact surface velocity dispersion.