hello I want to ask about soil improvement modeling using PVD. I'm currently modeling soil improvement using PVD with a plan strain model on Plaxis 2D, does equivalence need to be done if modeling using PVD with a plan strain model?
Hi Randy,In order to simulate the 3D condition in reality, i.e. radial drainage, the 2D finite element (FE) model needs to be adjusted. Such adjustment can be achieved via geometric and/or permeability matching.In the past, various methods for modelling the PVD-improved subsoil in plane strain analysis were presented, which can generally be classified into four categories [see Shinsha et al. (1982), Sekiguchi et al. (1986), Hird et al. (1992), Asaoka et al. (1995), Chai et al. (1995, 2001), Kim et al. (2018), etc.]I suggest that you research the available material on the subject. It will undoubtedly help you.
if in plaxis is there any specific specification regarding the PVD parameters used? be it PVD width and PVD thickness to PVD permeability? if there is where can i find the PVD parameters used in the plaxis 2D?
Hi Randy,The vertical drain installed in subsoil are usually modelled using the Drains tool. The PVDs are modelled as Drains which prescribe lines inside the geometry model where (excess) pore water pressures are set to zero in the (consolidation) analysis.Here is also an interesting read on the topic: https://communities.bentley.com/products/geotech-analysis/w/plaxis-soilvision-wiki/46044/drainage-line-elements-in-plaxis-2d-and-3d-applied-in-consolidating-marine-clay-deposits
I did consolidation analysis with line drains, but the excess pore pressure is not zero at soil-drain interface. Why is it happening?
Hi Akhil,
I think your question is unrelated to the original post and it would be impossible to give an answer given the limited information.Can you please submit a Service Request, so we can investigate further?