| Abstrakt: |
Pendulum-type wave is a kind of sign-alternating wave with discontinuous and nonlinear characteristics found in deep rock mass, which is different from the traditional continuum elastic waves. The new dynamic engineering disasters such as rockbrusts and anomalously low friction phenomenon occur frequently in deep rock mass, and the study of pendulum-type wave is of great significance for explaining the mechanism and prevention of these engineering disasters. Aiming to the nonlinear deformation characteristics of deep rock mass, a nonlinear dynamic model of pendulum-type wave in block-rock mass is established by introducing hyperbolic elastic model, and the time-domain characteristics, frequency-domain characteristics, and the law of energy transfer are studied. Furthermore, the influence of initial geostress on pendulum-type wave propagation in nonlinear block-rock mass is studied. The research shows that the improved model can not only shows the nonlinear deformation of block-rock mass, but also limits the maximum compression deformation of cracks between rock blocks. Under the action of small impact loading and strong impact loading, the acceleration in nonlinear block-rock mass has completely different rules. With the increase of initial geostress, the displacement amplitude decreases in approximate exponential form. Therefore, we have made a prediction that in the ultra-high stress state, the pendulum-type wave phenomenon will not occur in block-rock mass, and the wave propagation is close to the longitudinal wave. This paper provides a fine reference for further study on pendulum-type wave propagation in block-rock mass under the conditions of nonlinear, strong impact, and high initial geostress. [ABSTRACT FROM AUTHOR] |
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