Abstract: This paper has conducted an analysis of the attenuation characteristic of the stress waves when propagating in different wave impedance interfaces between media based on stress wave theory. Subsequently, the theoretical relationship between energy attenuation and wave impedance ratio has been established. Based on the results of the analysis, the paper has put forward a new type of reinforced support structure, namely, the reinforced annular region. Specific reinforcement methods for the annular region are adopted within the roadway surrounding rock to reinforce the rock mass strength and then form the high-intensity annular reinforcing structure. This structure has not only enhanced the overall strength of the surrounding rock, but also significantly attenuated the energy of the stress wave in the reinforced annular region. Thus, the damaging effect on the roadway has been reduced. In order to further verify the results, a numerical model has been built using the software FLAC3D for a comparative analysis of the damage situations via dynamic disturbance, with and without the setting of the reinforced circle on the roadway, and the energy attenuation characteristics of the stress wave has also been tested. The results have indicated that the stress wave shows clear energy attenuation with the reinforced circle, and the damaging effect on the roadway is reduced. The theoretical analysis and numerical simulation results have both verified that the reinforced structure effectively can improve the stability of the surrounding rock and reduce roadway deformation and damage through its dual function of strengthening the support and attenuating the dynamic disturbance. These features have presented potential applications for deep surrounding rock control technology.

Key words: deep roadway, reinforced annular region, wave impedance, energy attenuation