Abstract: R. S. Sandhu and E.L. Wilson presented "Finite Element Analysis of Seepage in Elastic Media"^[1], by which complex problems in engineering can be solved. In this paper, it is extended to the case of viscoe-lastic media. If the soil skeleton is regarded as viscoelastic media, the stress-strain relation will be changed with time, which increases the complexity of problems. By making use of the finite-element method to solve such problems, the linear stress-strain increment relation is considered in every preselective interval of time. The linear proportional constant here is called "equivalent elastic tensor". On the basis of the equivalent elastic tensor, this paper deduces the formulation for solving problems in viscoelastic media.

Key words: orthotropic, plane problem, spline function, boundary element method