Abstract
The surrounding rock is divided into the elastic zone and the plastic zone according to the motion and deformation characteristics of the medium in rock blasting. The vibration caused by the cylindrical charge blasting is outlined on the basis of previous research concerning the blasting elastic-plastic theory. Meanwhile, a superposition model is used to calculate the vibration of cylindrical charge blasting on the premise of considering the influence of detonation velocity, the number of drug columns, and the time delay between holes. The analysis results show that the blasting causes the uneven spatial distribution of vibration, containing both strong and weak directions. The velocity of the vibration along weak directions decreases slowly with the increase of distance. But generally, the velocity along weak directions is faster. The vibration distribution of a cylindrical charge is closely related to the detonator location. Furthermore, more vibration distributes towards the forward direction of the detonation wave.
Highlights
Duvall [14] calculated the shape of displacement, velocity, acceleration, and strain wave pulses in an isolated elastic medium, among which the pressure pulses are applied in a spherical cavity
Blair [17] probed the influences of the detonation velocity and completely scaleindependent parameters on the characteristics of seismic waves caused by the superposition of point spherical charges. en, the model was analyzed by combining it with other available experimental results
It gave out the expression formula of dominant frequency and amplitude and analyzed the main influencing factors. e spherical cavity source model was used to establish the relationship between the explosive parameters, the elastic medium parameters, and the cavity size and seismic wavefield, which, despite simplifying the physical and chemical process of blasting, could not establish the direct relationship between the characteristics of the explosion source and the characteristics of amplitude and frequency in the seismic wavefield
Summary
Duvall [14] calculated the shape of displacement, velocity, acceleration, and strain wave pulses in an isolated elastic medium, among which the pressure pulses are applied in a spherical cavity. E wave equation of elastic wave was obtained by a combined solution established based on the thermodynamics theory, the rock failure theory, and the spherical wave motion equation It gave out the expression formula of dominant frequency and amplitude and analyzed the main influencing factors. E spherical cavity source model was used to establish the relationship between the explosive parameters, the elastic medium parameters, and the cavity size and seismic wavefield, which, despite simplifying the physical and chemical process of blasting, could not establish the direct relationship between the characteristics of the explosion source and the characteristics of amplitude and frequency in the seismic wavefield. Yu et al [20] developed the cavity source model, introduced the prediction model describing the initial conditions of the cavity and the viscoelastic model describing the absorption attenuation of the medium, and established the theoretical model of the seismic wavefield excited by the explosive source
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