A practical and efficient numerical scheme for the analysis of steady state unconfined seepage flows

The scaled boundary finite-element method (SBFEM), a novel semi-analytical technique, is applied to the analysis of the confined and unconfined seepage flow. This method combines the advantages of the finite-element method and the boundary element method. In this method, only the boundary of the domain is discretized; no fundamental solution is required, and singularity problems can be modeled rigorously. Anisotropic and nonhomogeneous materials satisfying similarity are modeled without additional efforts. In this paper, SBFE equations and solution procedures for the analysis of seepage flow are outlined. The accuracy of the proposed method in modeling singularity problems is demonstrated by analyzing seepage flow under a concrete dam with a cutoff at heel. As only the boundary is discretized, the variable mesh technique is advisable for modeling unconfined seepage analyses. The accuracy, effectiveness, and efficiency of the method are demonstrated by modeling several unconfined seepage flow problems. Copyright (c) 2011 John Wiley & Sons, Ltd.