# Latest **URL:** https://forum.itascainternational.com/latest.md [Latest](https://forum.itascainternational.com/latest.md) · [Categories](https://forum.itascainternational.com/categories.md) · [Tags](https://forum.itascainternational.com/tags.md) --- ## [Welcome to Discourse](https://forum.itascainternational.com/t/welcome-to-discourse/7)
**Author:** [@system](https://forum.itascainternational.com/u/system)\ **Replies:** 0\ **Last updated:** [July 9, 2021, 6:57pm UTC](https://forum.itascainternational.com/t/welcome-to-discourse/7 "2021-07-09T18:57:12Z")
This is a discussion forum for users of Itasca software (3DEC, FLAC, FLAC3D, Griddle, KATS, MineDW, PFC, UDEC, and XSite). Post questions, look for answers, and discuss cool ideas. Anyone can join, but you need a valid … --- ## [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… --- ## [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. --- ## [How to Start Post-Shake Consolidation After Compliant-Base Dynamic Analysis in FLAC2D?](https://forum.itascainternational.com/t/how-to-start-post-shake-consolidation-after-compliant-base-dynamic-analysis-in-flac2d/2386)
**Author:** [@EmirhanAltinok](https://forum.itascainternational.com/u/EmirhanAltinok)\ **Replies:** 5\ **Last updated:** [September 16, 2026, 5:46pm UTC](https://forum.itascainternational.com/t/how-to-start-post-shake-consolidation-after-compliant-base-dynamic-analysis-in-flac2d/2386 "2026-09-16T17:46:39Z")
Hello all, I am performing nonlinear dynamic effective-stress SSI analyses in FLAC2D 9.0 using PM4Sand and PM4Silt. The model includes two buildings represented by elastic beam elements. The earthquake motion is applied … --- ## [Hydro-mechanical Calculation](https://forum.itascainternational.com/t/hydro-mechanical-calculation/1053)
**Author:** [@DariushJ](https://forum.itascainternational.com/u/DariushJ)\ **Replies:** 13\ **Last updated:** [September 1, 2026, 3:35pm UTC](https://forum.itascainternational.com/t/hydro-mechanical-calculation/1053 "2026-09-01T15:35:43Z")
Hi, I try to understand how 3DEC performs hydro-mechanical calculations. From manual of 3DEC 5.20 I understood a little, but I will be grateful if someone can simply explain the computation loop from start point to the … --- ## [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… --- ## [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 … --- ## [Energy Components Calculations in PFC](https://forum.itascainternational.com/t/energy-components-calculations-in-pfc/2142)
**Author:** [@AlaaAbdallah](https://forum.itascainternational.com/u/AlaaAbdallah)\ **Replies:** 6\ **Last updated:** [August 10, 2026, 5:33pm UTC](https://forum.itascainternational.com/t/energy-components-calculations-in-pfc/2142 "2026-08-10T17:33:34Z")
Hello, Could anyone please help in navigating to a script or fishtank package that calculates the energy components in a rock specimen after triaxial testing? Thanks. --- ## [Thermal-creep coupling in FLAC3D](https://forum.itascainternational.com/t/thermal-creep-coupling-in-flac3d/2400)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 1\ **Last updated:** [August 3, 2026, 11:02am UTC](https://forum.itascainternational.com/t/thermal-creep-coupling-in-flac3d/2400 "2026-08-03T11:02:22Z")
Dear all, I am working on a coupled thermal-creep model. The coupling would be one way from thermal to creep through the thermal dependency of the creep parametrisation (I am using the power constitutive model). This b… --- ## [Is it possible to access the python console from the non gui version of flac](https://forum.itascainternational.com/t/is-it-possible-to-access-the-python-console-from-the-non-gui-version-of-flac/1850)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 3\ **Last updated:** [August 3, 2026, 10:45am UTC](https://forum.itascainternational.com/t/is-it-possible-to-access-the-python-console-from-the-non-gui-version-of-flac/1850 "2026-08-03T10:45:30Z")
Hi, I use the non-gui version of flac3d with the executable fla3d\_console on a linux server that does not have a gui interface. I wanted to know if there was a way to access the python console in this version of FLAC3D… --- ## [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… --- ## [Error in restoring the model inside the loop](https://forum.itascainternational.com/t/error-in-restoring-the-model-inside-the-loop/2077)
**Author:** [@SahilW](https://forum.itascainternational.com/u/SahilW)\ **Replies:** 4\ **Last updated:** [July 31, 2026, 11:01am UTC](https://forum.itascainternational.com/t/error-in-restoring-the-model-inside-the-loop/2077 "2026-07-31T11:01:20Z")
Dear all, I want to restore the model inside the loop so I can automate the extraction of the results. But when I try the following code, it gives me the error :" fish define dataextract loop local i(0,15) local e0 … --- ## [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 … --- ## [Geogrid Structural Element and Groundwater Flow in FLAC3D](https://forum.itascainternational.com/t/geogrid-structural-element-and-groundwater-flow-in-flac3d/2398)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [July 3, 2026, 3:10am UTC](https://forum.itascainternational.com/t/geogrid-structural-element-and-groundwater-flow-in-flac3d/2398 "2026-07-03T03:10:46Z")
Hi everyone, @itascan @dafo407\_itasca @itasca @ddegagne @dblanksma I am modeling a reinforced soil wall in FLAC3D where geogrid structural elements are used as reinforcement. In my study, the reinforcement should not ac… --- ## [How to group heading and benching portion separate in a tunnel model?](https://forum.itascainternational.com/t/how-to-group-heading-and-benching-portion-separate-in-a-tunnel-model/2391)
**Author:** [@tanvikedare](https://forum.itascainternational.com/u/tanvikedare)\ **Replies:** 1\ **Last updated:** [June 19, 2026, 1:22pm UTC](https://forum.itascainternational.com/t/how-to-group-heading-and-benching-portion-separate-in-a-tunnel-model/2391 "2026-06-19T13:22:17Z")
Hi all. Ive been trying to use the tunnel function in my 3dec v 5.2 to create a tunnel but in order to group it in two parts I am unable to model the false invert and bifurcate the tunnel in two, basically heading and be… --- ## [Bade distortion](https://forum.itascainternational.com/t/bade-distortion/2393)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 1\ **Last updated:** [June 18, 2026, 5:34pm UTC](https://forum.itascainternational.com/t/bade-distortion/2393 "2026-06-18T17:34:14Z")
I am seeing significant base distortion when applying a strong subduction-zone earthquake motion. The input is applied only in the horizontal direction, and the base is modeled as a compliant boundary. Increasing the bed… --- ## [Do not want the ball to come out of wall during cycling](https://forum.itascainternational.com/t/do-not-want-the-ball-to-come-out-of-wall-during-cycling/2396)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 0\ **Last updated:** [June 16, 2026, 7:53am UTC](https://forum.itascainternational.com/t/do-not-want-the-ball-to-come-out-of-wall-during-cycling/2396 "2026-06-16T07:53:50Z")
Hello to everyone, I am trying to study the slope with ball distributed being inside the wall and calmed to null the velocity. Thereafter, the contact model is called and with ball property and attribute being given. A… --- ## [Can a time varying external load applied to a saturated soil mass generate excess pore pressure when using Mohr-Coulomb in a coupled fluid-mechanical analysis?](https://forum.itascainternational.com/t/can-a-time-varying-external-load-applied-to-a-saturated-soil-mass-generate-excess-pore-pressure-when-using-mohr-coulomb-in-a-coupled-fluid-mechanical-analysis/2395)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [June 15, 2026, 5:21pm UTC](https://forum.itascainternational.com/t/can-a-time-varying-external-load-applied-to-a-saturated-soil-mass-generate-excess-pore-pressure-when-using-mohr-coulomb-in-a-coupled-fluid-mechanical-analysis/2395 "2026-06-15T17:21:35Z")
Hello @everyone, @itascaYang @isaac @itsmoho\_sen @ITE @itascaYang @itasca @dafo407\_itasca @ddegagne @dblanksma @itmam I am running a coupled fluid–mechanical FLAC3D model using the Mohr-Coulomb constitutive model. I hav… --- ## [Modeling Centrifuge Test with Attached Boundary Conditions in FLAC](https://forum.itascainternational.com/t/modeling-centrifuge-test-with-attached-boundary-conditions-in-flac/1779)
**Author:** [@EmirhanAltinok](https://forum.itascainternational.com/u/EmirhanAltinok)\ **Replies:** 4\ **Last updated:** [June 11, 2026, 9:05pm UTC](https://forum.itascainternational.com/t/modeling-centrifuge-test-with-attached-boundary-conditions-in-flac/1779 "2026-06-11T21:05:35Z")
Hello Everyone, I am currently working on modeling a centrifuge test at prototype scale. My geometry includes three liquefiable sand layers with varying relative densities (Dr), so I am using the PM4Sand model. The expe… --- ## [Applying Varying Distributed Load on a Surface in FLAC3D](https://forum.itascainternational.com/t/applying-varying-distributed-load-on-a-surface-in-flac3d/2387)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 12\ **Last updated:** [June 5, 2026, 6:51pm UTC](https://forum.itascainternational.com/t/applying-varying-distributed-load-on-a-surface-in-flac3d/2387 "2026-06-05T18:51:56Z")
Hello @everyone, @itascaYang @dafo407\_itasca @itasca @itascan I need to apply a varying distributed load on a surface in FLAC3D. The loading needs to increase and decrease along the surface height/direction instead of … --- ## [What is the impact of having tetrahedra in a FLAC3D mesh](https://forum.itascainternational.com/t/what-is-the-impact-of-having-tetrahedra-in-a-flac3d-mesh/2371)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 5\ **Last updated:** [June 3, 2026, 8:00am UTC](https://forum.itascainternational.com/t/what-is-the-impact-of-having-tetrahedra-in-a-flac3d-mesh/2371 "2026-06-03T08:00:59Z")
Hi, I am having a challenge with a mesh in FLAC3D 9.4 I generated in Griddle 3.0. I am solving a creep problem with a relatively complex geometry which led Griddle to generate quiet a lot of pyramid (~14% of zones) and… --- ## [Applying Time-Varying Non-Uniform Surface Pressure in FLAC3D](https://forum.itascainternational.com/t/applying-time-varying-non-uniform-surface-pressure-in-flac3d/2390)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [June 2, 2026, 5:18pm UTC](https://forum.itascainternational.com/t/applying-time-varying-non-uniform-surface-pressure-in-flac3d/2390 "2026-06-02T17:18:27Z")
Hello everyone and Itasca support team, @itascaYang @isaac @itsmoho\_sen @ITE @Inwoo @Inu @itmam @itasca @dafo407\_itasca @dblanksma I am trying to apply a time-varying non-uniform distributed pressure on a surface in FL… --- ## [Questions About Fully Coupled Flow–Mechanical Analysis and Solution-Control Parameters in FLAC3D](https://forum.itascainternational.com/t/questions-about-fully-coupled-flow-mechanical-analysis-and-solution-control-parameters-in-flac3d/2389)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [June 1, 2026, 3:48pm UTC](https://forum.itascainternational.com/t/questions-about-fully-coupled-flow-mechanical-analysis-and-solution-control-parameters-in-flac3d/2389 "2026-06-01T15:48:49Z")
Hello @everyone, @itascaYang @isaac @itsmoho\_sen @ITE @Inwoo @Inu @itasca @dafo407\_itasca @itascan I am planning to perform a fully coupled flow–mechanical analysis in FLAC3D. My current understanding of the command seq… --- ## [Guidance on Introducing Fluid, Biot Coupling, and Water Table for Mechanical Pore Pressure Generation in FLAC3D](https://forum.itascainternational.com/t/guidance-on-introducing-fluid-biot-coupling-and-water-table-for-mechanical-pore-pressure-generation-in-flac3d/2388)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 0\ **Last updated:** [May 29, 2026, 2:55am UTC](https://forum.itascainternational.com/t/guidance-on-introducing-fluid-biot-coupling-and-water-table-for-mechanical-pore-pressure-generation-in-flac3d/2388 "2026-05-29T02:55:47Z")
Hello @everyone, @itascan @itascaYang @itasca @dafo407\_itasca @itsmoho\_sen @isaac I am trying to introduce fluid behavior and Biot coupling in a FLAC3D model so that pore pressure can be generated when external loading … --- ## [Hel needed: Simulation of Direct Shear Test](https://forum.itascainternational.com/t/hel-needed-simulation-of-direct-shear-test/2385)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 3\ **Last updated:** [May 15, 2026, 4:20pm UTC](https://forum.itascainternational.com/t/hel-needed-simulation-of-direct-shear-test/2385 "2026-05-15T16:20:52Z")
Subject: Help required for Direct Shear Test (DST) simulation in PFC2D with moving bottom box I am trying to simulate a Direct Shear Test (DST) in PFC2D. I have been following the built-in PFC2D direct shear example, wh… --- ## [To delete the ball present in not need region](https://forum.itascainternational.com/t/to-delete-the-ball-present-in-not-need-region/2382)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 1\ **Last updated:** [May 11, 2026, 4:50pm UTC](https://forum.itascainternational.com/t/to-delete-the-ball-present-in-not-need-region/2382 "2026-05-11T16:50:07Z")
Respected everyone, I am trying to simulate an UCS sample with crack in PFC. The ball is getting deleted with in the specified region but further compaction the ball from is coming in between the region. The code is at… --- ## [Apply stress in 3DEC](https://forum.itascainternational.com/t/apply-stress-in-3dec/607)
**Author:** [@rdhoaziz](https://forum.itascainternational.com/u/rdhoaziz)\ **Replies:** 6\ **Last updated:** [May 11, 2026, 4:28pm UTC](https://forum.itascainternational.com/t/apply-stress-in-3dec/607 "2026-05-11T16:28:03Z")
Hello, I would like to ask question about how to apply a stress to a column. I have a column or block bar with 0.5m x 0.5m x 5m (x,y,z) as an elastic body. I would like to apply a triangular stress 3MPa at the top of the… --- ## [Wetting Induced Deformation Simulation- Infiltration result questionable](https://forum.itascainternational.com/t/wetting-induced-deformation-simulation-infiltration-result-questionable/2381)
**Author:** [@Adams](https://forum.itascainternational.com/u/Adams)\ **Replies:** 0\ **Last updated:** [May 8, 2026, 6:53pm UTC](https://forum.itascainternational.com/t/wetting-induced-deformation-simulation-infiltration-result-questionable/2381 "2026-05-08T18:53:52Z")
Hi, I am trying to simulate a wetting induced deformation of an embankment. I used FISH function to couple the hydraulic and stress strain behavior using Modified Cam Clay as the mechanical constitutive model and hydraul… --- ## [Clarification on Dynamic Timestep Calculation in FLAC2D](https://forum.itascainternational.com/t/clarification-on-dynamic-timestep-calculation-in-flac2d/2380)
**Author:** [@Miguel\_S](https://forum.itascainternational.com/u/Miguel_S)\ **Replies:** 1\ **Last updated:** [May 7, 2026, 3:14pm UTC](https://forum.itascainternational.com/t/clarification-on-dynamic-timestep-calculation-in-flac2d/2380 "2026-05-07T15:14:24Z")
Dear Itasca Support Team, I am currently reviewing the dynamic timestep formulation in the FLAC manual, particularly Equations (3.13) and (3.14), and I would appreciate some clarification regarding their practical inter… [Next page](https://forum.itascainternational.com/latest.md?page=1)