Abstract
The three-dimensional wave-field characteristics of dangerous earth-rock dams are the premise and foundation to identify the hidden hazards of the earth-rock dams via wave test method. Based on the equivalent elastic wave theory in isotropic mediums, the three-dimensional wave field of earth-rock dams with different defects was calculated using the finite element numerical simulation method. The characteristic and regularity of the three-dimensional wave field was explored. The result of the analysis shows that the size and position of the defects are closely related with the wave-field information received on the dam surface. The elasticity modulus and density of the defects have great effect on the wave field, and alternately, Poisson’s ratio of the defects has little effect on the wave field. The greater the difference between the wave velocity of the hazardous materials and the dam body is, the stronger the energy of the scattered wave will be, which in turn will produce clearer lineups of the scattered wave on the time-history profile. For a single wave movement signal, the dominant frequency amplitude is exponentially correlated with the longitudinal wave velocity of the hazardous materials. Therefore, in the process of wave detection for earth-rock dam hazards, the effect of the elasticity modulus, density, and wave velocity on the test signal should be taken into account. The dominant frequency amplitude can serve as one of the control parameters for interpretation of dam hazards by the analysis of the wave test signal.
Highlights
Geophysical exploration techniques is an important tool for studying the Earth’s nonuniform structural and dynamic processes, and seismic tomography is one of the most widely used methods [1, 2]
Scholars have studied the application of seismic wave detection technology for earth-rock dams. is method was initially used for the geological exploration of the dam and was gradually utilized for detection of the hidden hazards [6,7,8]
Research shows that the wave signals on the dam surface contain abundant information of the dam’s internal structure, it is difficult to improve its inversion accuracy using wave velocity parameters. erefore, a key application of wave detection technology has become determining how to extract the information about hidden hazards from the test signal
Summary
Geophysical exploration techniques is an important tool for studying the Earth’s nonuniform structural and dynamic processes, and seismic tomography is one of the most widely used methods [1, 2]. Scholars have studied the application of seismic wave detection technology for earth-rock dams. Erefore, a key application of wave detection technology has become determining how to extract the information about hidden hazards from the test signal. It is necessary to analyze the wave-field distribution characteristics of the dam in order to effectively extract the information of the hidden hazard from the test signal. E wave equation numerical simulation method is an effective means of studying the wave propagation law and analyzing the internal wave-field distribution of the structure. Erefore, Advances in Civil Engineering more and more numerical simulation methods are used to study the propagation characteristics of seismic waves in structures. The interpretation method and wave-field characteristics of the existing nondestructive test data cannot directly serve as the basis for detecting the hidden dam’s hazard. It is necessary to describe the wave-field characteristics of an earth-rock dam via wave detection technique
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