Abstract:Pendulum wave occurs in the blocky rock mass, and is very different from the elastic wave in the continuum medium. Pendulum wave carries large energy and and can cause easily various engineering geological disasters, such as rock bursts. Based on the one-dimensional dynamic model of pendulum wave propagation in block system rock mass, the energy value of pendulum wave in block system with different stiffness, viscosity and block size is solved by using central difference method, and the influence of the above factors on energy conversion and dissipation is analyzed. The results show that with the increase of stiffness coefficient, the maximum value of the elastic potential energy of each block also increases and the attenuation period of kinetic energy and elastic potential energy of the system decrease; the larger the viscosity coefficient is, the smaller the maximum value of elastic potential energy of each block is, the energy peak decays more rapidly in each period, and the energy decay rate becomes faster; with the decrease of block size, the period of the system kinetic energy and elastic potential energy becomes larger, the energy peak decreases significantly, and the decay rate of the total energy of the system in the early stage becomes faster. Affected by the fixed end, the maximum kinetic energy and maximum elastic potential energy of the blocks close to the fixed end will increase, and the increase in the maximum elastic potential energy is much larger than the increase in the kinetic energy. Based on the above research, our understanding of the dynamic properties of deep block rock mass is further deepened, which is of great significance to prevent engineering disasters and ensure engineering safety.