Abstract: The phenomena of incompatible deformation are observed in the block rock mass on dynamic propagation between blocks and block partings composed of the weak medium. The dynamic incompatible deformation influences the stability of the block rock mass. At present, the studies of characteristics response of block rock mass incompatible deformation are limited, which induced the difficulty to recognize this dynamic phenomenon. In this paper, the characteristics of the incompatible dynamic response of block rock are studied through experiments. The incompatible deformation characteristics of block rock mass are analysed. The velocity of dynamic propagation, attenuation of block acceleration amplitude, displacement of block rock vibration, duration time of block vibration and kinetic energy of the block, the frequency response of blocks are analyzed on the dynamic propagation in the block rock mass. Compared with the longitudinal wave, incompatible deformation dynamic propagation in the block rock mass is low-frequency and slow-velocity wave. When block rock mass has incompatible deformation, the vibration displacement of block rock and vibration duration time are increased. In this process, it contains conversion between kinetic energy and potential energy. These phenomena are critical characteristics to recognize the incompatible deformation dynamic propagation. This study provides the reference for the recognition of incompatible dynamic propagation in the block rock mass and wave warning of block rock mass on impact response.

Key words: block rock mass, incompatible deformation, rock dynamics, rock burst