# Top **URL:** https://forum.itascainternational.com/top.md?period=quarterly [Latest](https://forum.itascainternational.com/latest.md) · [Categories](https://forum.itascainternational.com/categories.md) · [Tags](https://forum.itascainternational.com/tags.md) --- ## [Dynamic Effective Stress Analysis (PM4Sand/PM4Silt) : Interpreting Large-Strain Collapse vs. Large-Strain Off Displacements](https://forum.itascainternational.com/t/dynamic-effective-stress-analysis-pm4sand-pm4silt-interpreting-large-strain-collapse-vs-large-strain-off-displacements/2412)
**Author:** [@stmicheljerome](https://forum.itascainternational.com/u/stmicheljerome)\ **Replies:** 1\ **Last updated:** [September 23, 2026, 6:31am UTC](https://forum.itascainternational.com/t/dynamic-effective-stress-analysis-pm4sand-pm4silt-interpreting-large-strain-collapse-vs-large-strain-off-displacements/2412 "2026-09-23T06:31:29Z")
Hi everyone, I am currently running a dynamic effective stress analysis on a embankment dam model using FLAC2D, utilizing PM4Sand and PM4Silt constitutive models for the liquefiable/sensitive foundation and deposit laye… --- ## [PFC - Energy Balance](https://forum.itascainternational.com/t/pfc-energy-balance/2401)
**Author:** [@AlaaAbdallah](https://forum.itascainternational.com/u/AlaaAbdallah)\ **Replies:** 5\ **Last updated:** [July 31, 2026, 5:42pm UTC](https://forum.itascainternational.com/t/pfc-energy-balance/2401 "2026-07-31T17:42:17Z")
Hello, I am analyzing the energy balance in a triaxial compression simulation using the Linear Parallel Bond Model in PFC. I am tracking the boundary work (input energy), parallel bond strain energy, contact strain ener… --- ## [Spatially variable soil layers in FLAC 3D](https://forum.itascainternational.com/t/spatially-variable-soil-layers-in-flac-3d/2404)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 12:54pm UTC](https://forum.itascainternational.com/t/spatially-variable-soil-layers-in-flac-3d/2404 "2026-08-11T12:54:22Z")
I am working with a 3D model that has a spatially varying soil profile. What is the recommended method for assigning soil layer groups? Can soil layers be interpolated from a few 2D cross sections? Any example workflows … --- ## [Error: Property pb\_radius of contact model linearpbond is read only!](https://forum.itascainternational.com/t/error-property-pb-radius-of-contact-model-linearpbond-is-read-only/2402)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 1\ **Last updated:** [July 27, 2026, 1:23pm UTC](https://forum.itascainternational.com/t/error-property-pb-radius-of-contact-model-linearpbond-is-read-only/2402 "2026-07-27T13:23:40Z")
Hello everyone, I am trying to assign the following parallel bond properties in PFC3D: contact property pb\_ten 2.111e4 pb\_coh 3.0e3 pb\_fa 35 pb\_rmul 2.5 pb\_r 0.5 However, I receive the following error: \*\*\* Property … --- ## [Importing geometry in PFC](https://forum.itascainternational.com/t/importing-geometry-in-pfc/2408)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 1\ **Last updated:** [August 15, 2026, 5:34am UTC](https://forum.itascainternational.com/t/importing-geometry-in-pfc/2408 "2026-08-15T05:34:04Z")
Hello sir, I want to simulate the rockslide on the geometry which is created in rhino. As shown in figure, used extrudealongcrv to make geometry of slope surface. But when imported in pfc i am unable to proper impor… --- ## [Crash When Applying Maxwell Damping to Liner Elements in Dynamic Analysis](https://forum.itascainternational.com/t/crash-when-applying-maxwell-damping-to-liner-elements-in-dynamic-analysis/2415)
**Author:** [@BZH](https://forum.itascainternational.com/u/BZH)\ **Replies:** 3\ **Last updated:** [September 30, 2026, 2:13pm UTC](https://forum.itascainternational.com/t/crash-when-applying-maxwell-damping-to-liner-elements-in-dynamic-analysis/2415 "2026-09-30T14:13:27Z")
I’m modifying the Embedded Retaining Wall (FLAC2D) example and added Maxwell damping to the liner elements for a dynamic analysis using: structure dynamic damping maxwell 0.0385 0.5 0.0335 3.5 0.052 25.0 I’ve attached … --- ## [How to Apply Lateral Boundary Attachment for a 1D Model in FLAC2D 9.4?](https://forum.itascainternational.com/t/how-to-apply-lateral-boundary-attachment-for-a-1d-model-in-flac2d-9-4/2417)
**Author:** [@Miguel\_S](https://forum.itascainternational.com/u/Miguel_S)\ **Replies:** 1\ **Last updated:** [October 5, 2026, 10:26am UTC](https://forum.itascainternational.com/t/how-to-apply-lateral-boundary-attachment-for-a-1d-model-in-flac2d-9-4/2417 "2026-10-05T10:26:59Z")
Hi everyone, I am migrating a 1D dynamic analysis from FLAC 8.1 to FLAC2D 9.4 and I am having difficulty reproducing the lateral boundary attachment condition. In my FLAC 8.1 model, the two lateral boundaries were atta… --- ## [Disable Temp Sav Folders](https://forum.itascainternational.com/t/disable-temp-sav-folders/2413)
**Author:** [@jng](https://forum.itascainternational.com/u/jng)\ **Replies:** 1\ **Last updated:** [September 22, 2026, 2:39pm UTC](https://forum.itascainternational.com/t/disable-temp-sav-folders/2413 "2026-09-22T14:39:18Z")
Hi Itasca! Whenever I run my models in FLAC3D, 3DEC etc I get these temp folders (i think they’re temp sav folders??) in my project that I can’t seem to disable. I’ve tried turning off the options already in my FLAC3D, … --- ## [Azure Performance](https://forum.itascainternational.com/t/azure-performance/2414)
**Author:** [@loneshark26](https://forum.itascainternational.com/u/loneshark26)\ **Replies:** 0\ **Last updated:** [September 22, 2026, 1:35pm UTC](https://forum.itascainternational.com/t/azure-performance/2414 "2026-09-22T13:35:06Z")
Just curious if anyone else has successfully configured FLAC2D into Azure compute, and if so, what SKU / CPU combo did you end up deploying? We found the F-series with AMD CPU to be the fastest when doing testing. --- ## [Convergence Issues After Introducing Interfaces, Modifying Boundary Conditions, and Converting Mohr-Coulomb to Finn/Byrne](https://forum.itascainternational.com/t/convergence-issues-after-introducing-interfaces-modifying-boundary-conditions-and-converting-mohr-coulomb-to-finn-byrne/2418)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [October 8, 2026, 2:17pm UTC](https://forum.itascainternational.com/t/convergence-issues-after-introducing-interfaces-modifying-boundary-conditions-and-converting-mohr-coulomb-to-finn-byrne/2418 "2026-10-08T14:17:36Z")
Title: FLAC3D – Convergence Issues After Introducing Interfaces, Modifying Boundary Conditions, and Converting Mohr-Coulomb to Finn/Byrne Hello everyone @itascan I am working on a 3D FLAC3D model consisting of multiple… --- ## [Accessing fish structure in python](https://forum.itascainternational.com/t/accessing-fish-structure-in-python/2419)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 0\ **Last updated:** [October 8, 2026, 6:47pm UTC](https://forum.itascainternational.com/t/accessing-fish-structure-in-python/2419 "2026-10-08T18:47:35Z")
Dear all, Does anyone as experience getting fish structures into python? What I mean is that you can access fish variables in python using itasca.fish.get() function. This does not work for fish structures as you get …