In this paper, the model of wave finite element is founded by analyzing the issue of the foundation containing channels excited by transient SH-wave in FEM. The method’s rationality and the simulation infinite territory issue are discussed. The establishment artificial boundary to satisfy the unlimited extent the request, as well as the unit division and the time integral length of stride selection problem are researched. The numerical value of the displacement of the cavity is obtained by calculating the dynamic responds of the underground U-shaped structure with ANSYS. Examples are provided to support the discussion.

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