Scattering Of Cylindrical SH Waves By Underground Circular Inclusion And Lined Tunnels

Along with the increasing severity of the problem of traffic and environment, it is an important part of modern city development to exploit and utilize the underground space cosmically. Scattering of cylindrical SH waves by the underground tunnel can affect the ground motion near the tunnel and the dynamic stress concentration of the tunnel. So, the cylindrical waves generated by the explosion may affect the safety of the original underground tunnel and it is necessary to compute the impact quantitatively.In this paper, a special boundary integral equation method will be used to study the scattering of cylindrical SH waves by underground, circular inclusion and lined tunnels. The total wave field is superposed by free field and scattered field. Scattered wave field is constructed by distributed line sources on the virtual source plane. The density of the virtual wave source can be gained by solving the equations which are derived by boundary conditions. Finally, the whole wave field can be achieved.The accuracy of the numerical result is checked up by the analytic solution and residual errors of boundary conditions. At the same time, the effects of some factors such as the frequency of the incident waves, the distance between the place where the cylindrical waves are excited and the inclusion or the tunnel, the depth of the inclusion or the tunnel and the lining's properties on the ground motion of the inclusion and also the dynamic stress concentration factor on the wall of the lined tunnel are illustrated. And some useful conclusions are derived in this thesis, which have great significance both in theory and in engineering application.