James Adinata's Communities Activities

E' and c'/Su increase with depth (not level) in a Plaxis 3D model with varying ground surface (slope)

Victor Dubasaru — Thu, 09 Dec 2021 08:13:09 GMT

Dear All,

I have a Plaxis 3D model in which the ground surface is a slope replicating the real topography (modelled using point cloud). Is there a way to assign E' and c'/Su increase with depth (not with level) in the Plaxis 3D model? Assigning E' and c'/Su increase with level for a slope generates unrealistic soil properties for soils in the bottom part of the slope if level (Zref) is choosen say at mid height slope.

Thank you.

Kind regards,

Victor

Increase of Stiffness in Hardening Soil with Undrained B

James Adinata — Thu, 02 Dec 2021 21:59:59 GMT

Hi PLAXIS team,

Reading from PLAXIS manual, I see the following and agree with it.

"PLAXIS has options to deal with undrained behaviour in an effective stress analysis, the use of undrained shear strength (cu or Su) may be preferred over the use of effective strength properties (φ' and c') in such cases"

So I have decided to use undrained B (using undrained shear strength) when modelling undrained behavior with Hardening Soil.

Can we model the increase of stiffness with stress/pressure/elevation when using Hardening Soil Undrained B?

Thanks!

Assigning material parameter to a group of elements without using geometric boundary

James Adinata — Tue, 16 Nov 2021 18:41:56 GMT

Hi Everyone,

Does anyone know a way to group some elements (without using geometric boundary) and assign a parameter to it?

The goal is to just assign the parameter if the elements located inside a set of coordinates while keeping the uniformity and the quality of the mesh.

Below is the illustrative example of it.

In my experience, adding a geometric boundary might reduce the quality of the mesh, especially near the sharp edges.

Thanks everyone!

Example of seismic/dynamic slope stability analysis in PLAXIS

James Adinata — Wed, 10 Nov 2021 18:59:34 GMT

Hi everyone,

Does anyone know if PLAXIS has provided an example of seismic/dynamic slope stability analysis? Hopefully with the command log / script so the its repeatability is ensured

So far, the example I have seen is only for building which given in the link below

https://communities.bentley.com/products/geotech-analysis/w/plaxis-soilvision-wiki/45568/plaxis-2d-tutorial-16-free-vibration-and-earthquake-analysis-of-a-building

Thanks!

Best,

James

Applying boundary condition and seismic loading at an irregular model base

James Adinata — Thu, 04 Nov 2021 17:38:15 GMT

Hi everyone,

Does anyone know how to apply a boundary condition (BC) and seismic loading at the bottom of a model which has irregular shape?

In my understanding, the default way of assigning BC in PLAXIS is at the location of Ymin.

The figure below show an illustrative example of this case.

Thanks a lot!

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Thu, 04 Nov 2021 00:52:19 GMT

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