Abstract
The acoustic wave test was carried out by selecting the joints of the joint surface and the horizontal plane at 0°, 30°, 45°, 60°, 75°, and 90° phyllite samples. According to the corresponding waveform diagram, the starting point is selected, and the dynamic deformation parameters of thousands of rock samples under various angles are calculated. The results show that: The anisotropy characteristics of the dynamic deformation parameters are obvious, and the influence of the variation of the joint surface inclination on the dynamic deformation parameters is achieved by affecting the wave impedance. P-wave impedance and S-wave impedance have different effects on rock dynamic deformation parameters. Generally, P-wave and S-wave impedance should be considered comprehensively for the dynamic deformation parameters of rock samples. Acoustic waves are in the elastic deformation law of the rock sample caused by the propagation in the rock sample is similar to the elastic deformation law caused by the external load acting on the rock sample.
Highlights
The dynamic deformation parameters of rock mass have dynamic Poisson's ratio, dynamic shear modulus, dynamic elastic modulus, dynamic bulk modulus, and dynamic Lame coefficient
It can be considered that the anisotropic characteristics of the rock sample affect the anisotropic characteristics of the transmitted wave velocity in the rock sample, which is reflected as the anisotropic characteristics of the wave impedance, and the anisotropic characteristics of the dynamic deformation parameters of the rock sample
When the P wave and the S wave propagate along the joint plane, it can be considered that the wave impedance reaches the maximum value at this time, and the corresponding wave velocity and dynamic deformation parameters reach the maximum value
Summary
The dynamic deformation parameters of rock mass have dynamic Poisson's ratio, dynamic shear modulus, dynamic elastic modulus, dynamic bulk modulus, and dynamic Lame coefficient. After receiving the P-wave and the S-wave, calculate the wave velocity by taking the jump point of the received waveform, and calculate the dynamic deformation parameter according to the wave velocity This test method is mainly based on the acoustic properties of the rock and soil. Song et al [12] obtained dynamic elastic modulus of rock by the acoustic wave velocity test of layered rock. With the increase of confining pressure, both the longitudinal wave velocity and the transverse wave velocity increase monotonically, and the dynamic elastic modes of different rock layers are considered. There are still few studies on the anisotropic characteristics of rock mass dynamic deformation parameters through the anisotropic characteristics of acoustic wave velocity. This paper focuses on the anisotropic characteristics of rock mass dynamic deformation parameters through the anisotropic characteristics of wave velocity
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