FEM validation of a double porosity elastic model for consolidation of structurally complex clayey soils
✍ Scribed by Callari, C.; Federico, F.
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 596 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0363-9061
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✦ Synopsis
Laboratory consolidation of structured clayey soils is analysed in this paper. The research is carried out by two di!erent methods. The "rst one treats the soil as an isotropic homogeneous equivalent Double Porosity (DP) medium. The second method rests on the extensive application of the Finite Element Method (FEM) to combinations of di!erent soils, composing 2D or fully 3D ordered structured media that schematically discretize the complex material. Two reference problems, representing typical situations of 1D laboratory consolidation of structured soils, are considered. For each problem, solution is obtained through integration of the equations governing the consolidation of the DP medium as well as via FEM applied to the ordered schemes composed of di!erent materials. The presence of conventional experimental devices to ensure the drainage of the sample is taken into account through appropriate boundary conditions. Comparison of FEM results with theoretical results clearly points out the ability of the DP model to represent consolidation processes of structurally complex soils. Limits of applicability of the DP model may arise when the rate of #uid exchange between the two porous systems is represented through oversimpli"ed relations. Results of computations, obtained having assigned reasonable values to the meso-structural and to the experimental apparatus parameters, point out that a partially e$cient drainage apparatus strongly in#uences the distribution along the sample and the time evolution of the interstitial water pressure acting in both systems of pores. Data of consolidation tests in a Rowe's cell on samples of arti"cially "ssured clays reported in the literature are compared with the analytical and numerical results showing a signi"cant agreement.