On the properties of the acoustic boundary between a solid and a liquid in the modeling of elastic waves in geo-environments in Comsol Multiphysics

The article describes the specificity of modeling the geophysical monitoring procedures for searching of voids behind subway tunnels lining. In particular, the model requires specific work with boundary conditions on the contact between a solid and a fluid. The obtained simulation results are compared with the results of real measurements in tun-nels. The specific features of the lining responses are revealed.