Response characteristics and reflection law of blast stress wave propagation in filling structures with different inclination angles
In order to investigate the propagation characteristics of blasting stress wave in the rock body of filling structure surface,blasting vibration monitoring and dynamic strain test are carried out through similar model blasting test,and the response characteristics and reflection law of blasting stress wave in the rock body of filling structure surface are analyzed from the perspective of blasting vibration velocity,power spectrum,dynamic strain,stress distribution,and numerical simulation is carried out on the rock body of structural surface under the action of blasting load by using ANSYS/LS-DYNA.Numerical simulation of the rock body under the blasting load using ANSYS/LS-DYNA,the following conclusions were obtained:the attenuation of radial and vertical vibration generated by blasting is relatively small after passing through the structural surface,and the attenuation decreases with the increase of the angle of the structural surface,while the opposite is true for tangential vibration;the amplitude of the power spectral density of the signal of the rock body region of the stress wave after passing through the structural surface is smaller than the angle of the structural surface,the attenuation degree becomes larger,and the seismic waves are concentrated to lower frequencies with a tendency to be concentrated in lower frequencies,and the seismic waves have a tendency to be concentrated in lower frequencies.After the seismic wave passes through the structural surface,the main frequency of seismic wave has a tendency to concentrate in the low frequency,and this phenomenon is more obvious in the rock body of low inclination structural surface;the intensity of radial compressive strain decreases with the increase of the angle of structural surface,and the main transmittance is produced after the stress wave arrives at the back of the structural surface,which makes the intensity of the tensile strain lower;the strength of the tangential strain is low,and the stress wave arrives at the structural surface,and the reflection of stress wave produces the new horizontally polarized transverse wave,so that the tensile strain is increased with the increase of the reflective energy.Increase,and its strength is much higher than the compressive strain;blasting stress wave propagation in the rock mass,the structural surface and the shortest distance from the source of the location will produce stress concentration phenomenon,which is due to the longitudinal wave transverse wave with the reflection coefficient of the changes in the stress components in different directions to make the superposition of different directions offset the formation of the stress component.With the increase in the angle of incidence,the stress wave will undergo by the compression wave to the tensile wave and then to the compression wave of a number of repeated processes.
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