Propagation of pendulum-type wave in two-dimensional block-rock mass with accurate consideration of rotation effect.

Rock mass is a typical inhomogeneous structure composed of hierarchically embedded rock blocks of different scales and separated by weaker interlayers. Due to weak mechanical properties of interlayers, the deformation of rock mass both in statics and dynamics is mainly concentrated in interlayers. Therefore, rock blocks as rigid bodies will experience translational and rotational motions, and the pendulum-type wave arises in rock mass. One-dimensional pendulum-type wave has been studied by many scholars, but two-dimensional pendulum-type wave has not been studied completely, especially the rotational motion of rock blocks should be considered. Therefore, the two-dimensional dynamic model of block-rock mass consisting of rectangular blocks separated by weaker interlayers is established based on accurate consideration of rotation effect. The applicability and reliability of this dynamic model are proved by comparing with experimental data. The propagation law and characteristics of pendulum-type wave in two-dimensional block-rock mass are investigated. Furthermore, the effect of these factors such as the viscous damping, geomechanical invariant and block size on the propagation of pendulum-type wave are determined. [ABSTRACT FROM AUTHOR]