Wave attenuation in porous media and its protective effect on shock wave

The earth medium can be regarded as a porous medium. Because the attenuation of the wave is very significant, it can effectively reduce the energy of the shock wave. The porous medium can be used as a protective material for the shock wave, which is of special significance for large underground structures. In this paper, the measurement results of the artificial joint porous medium filled with water or ice with large amplitude and rapidly rising stress pulse are given. The influence of water as solid or liquid phase in the joint on the explosion effect is discussed. In this paper, two physical models of wave attenuation in porous media, namely double pore model and partial saturation model, are used. The calculation results show that the predicted P-wave velocity, as well as the degree of rock attenuation and dispersion, are consistent with the measured data. Water or ice in the joint has a great attenuation of shock wave. However, water filled joints are more obvious. Due to filling different materials, they show different properties. Therefore, pores and joints can be filled with different attenuation protective materials to meet the needs of different situations.