Publication Details

This conference paper was originally published as Rujikiatkamjorn C and Indraratna, B, Three-Dimensional Analysis of Soft Soil Consolidation improved by Prefabricated Vertical Drains, in ASCE Special Geotechnical Publication No. 152. Proceedings of Geo-Shanghai 2006, Shanghai, China, 6-8 June 2006, 161-168. Original conference proceedings here.


A system of prefabricated vertical drains (PVDs) with a surcharge load is an effective method for accelerating soil consolidation by promoting radial flow. This study presents a three-dimensional (3D) finite element model for soft soil improved by a single drain. In the finite element analysis, the actual rectangular PVD cross-section is considered, and the equivalent drain diameter is then back calculated based on the consolidation curves. The numerical predictions are then compared to previous studies. The settlements observed in the laboratory are subsequently compared with the three-dimensional finite element analysis incorporating the modified Cam-Clay model and Hansbo’s theory.

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