# Top **URL:** https://forum.itascainternational.com/top.md [Latest](https://forum.itascainternational.com/latest.md) · [Categories](https://forum.itascainternational.com/categories.md) · [Tags](https://forum.itascainternational.com/tags.md) --- ## [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 … --- ## [Cyclic loading in PFC-2D](https://forum.itascainternational.com/t/cyclic-loading-in-pfc-2d/2348)
**Author:** [@Mujeeb](https://forum.itascainternational.com/u/Mujeeb)\ **Replies:** 11\ **Last updated:** [March 17, 2026, 6:11pm UTC](https://forum.itascainternational.com/t/cyclic-loading-in-pfc-2d/2348 "2026-03-17T18:11:25Z")
I am trying to apply cycling load to the top wall in a 2D biaxial test using the sinusoidal function (q = q0sinwt). From the literature, different values for omega (w) have been suggested, among which I selected 10\*pi a… --- ## [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… --- ## [Lateral drifting of whole FLAC2D model during liquefaction analysis](https://forum.itascainternational.com/t/lateral-drifting-of-whole-flac2d-model-during-liquefaction-analysis/2321)
**Author:** [@dineshn](https://forum.itascainternational.com/u/dineshn)\ **Replies:** 5\ **Last updated:** [January 26, 2026, 11:49pm UTC](https://forum.itascainternational.com/t/lateral-drifting-of-whole-flac2d-model-during-liquefaction-analysis/2321 "2026-01-26T23:49:22Z")
Hello Greetings to Itasca support team! I simulate soil liquefaction of level ground using FLAC2D & P2Psand model. Attached boundary conditions were imposed on lateral boundaries while the acceleration was applied alon… --- ## [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 … --- ## [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:** 3\ **Last updated:** [October 12, 2026, 6:20pm UTC](https://forum.itascainternational.com/t/dynamic-effective-stress-analysis-pm4sand-pm4silt-interpreting-large-strain-collapse-vs-large-strain-off-displacements/2412 "2026-10-12T18:20:24Z")
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… --- ## [Interpreting FOS results with fault interfaces in FLAC3D](https://forum.itascainternational.com/t/interpreting-fos-results-with-fault-interfaces-in-flac3d/2284)
**Author:** [@Luca86](https://forum.itascainternational.com/u/Luca86)\ **Replies:** 5\ **Last updated:** [January 21, 2026, 12:45pm UTC](https://forum.itascainternational.com/t/interpreting-fos-results-with-fault-interfaces-in-flac3d/2284 "2026-01-21T12:45:43Z")
Hi everyone, I am currently running a model of an open pit with faults using FLAC3D v7. The geological units were imported as DXF files, while the faults were added as planar structures via Griddle and defined as interf… --- ## [How to access zone joint contacts via FISH/Python](https://forum.itascainternational.com/t/how-to-access-zone-joint-contacts-via-fish-python/2310)
**Author:** [@LeoBBL](https://forum.itascainternational.com/u/LeoBBL)\ **Replies:** 2\ **Last updated:** [January 7, 2026, 11:32pm UTC](https://forum.itascainternational.com/t/how-to-access-zone-joint-contacts-via-fish-python/2310 "2026-01-07T23:32:50Z")
Hi everyone, I’m trying to find a way to access to zone joint contact variables either via FISH or Python (e.g., get/set properties, displacements, state, extras, etc). I haven’t found any guidance in the available docu… --- ## [Maxwell Damping in Nonlinear Dynamic Analysis](https://forum.itascainternational.com/t/maxwell-damping-in-nonlinear-dynamic-analysis/2357)
**Author:** [@Miguel\_S](https://forum.itascainternational.com/u/Miguel_S)\ **Replies:** 2\ **Last updated:** [March 26, 2026, 2:46am UTC](https://forum.itascainternational.com/t/maxwell-damping-in-nonlinear-dynamic-analysis/2357 "2026-03-26T02:46:32Z")
I have performed a dynamic analysis of an earth structure. Previously, I ran the model using Rayleigh damping (zone dynamic damping rayleigh 0.005 1.0) without encountering any issues during the simulation. However, whe… --- ## [Query about Rayleigh Damping Parameters in FLAC3D](https://forum.itascainternational.com/t/query-about-rayleigh-damping-parameters-in-flac3d/2299)
**Author:** [@MiguelN](https://forum.itascainternational.com/u/MiguelN)\ **Replies:** 5\ **Last updated:** [January 22, 2026, 4:21am UTC](https://forum.itascainternational.com/t/query-about-rayleigh-damping-parameters-in-flac3d/2299 "2026-01-22T04:21:53Z")
How can I query FLAC3D, version 7 or 9, to obtain the Rayleigh damping parameters (specially about alpha & beta), either through FISH or from the command line? Thanks in advance --- ## [FLAC Software Opening to a Blank Screen – Need Assistance](https://forum.itascainternational.com/t/flac-software-opening-to-a-blank-screen-need-assistance/2291)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 7\ **Last updated:** [November 24, 2025, 10:41pm UTC](https://forum.itascainternational.com/t/flac-software-opening-to-a-blank-screen-need-assistance/2291 "2025-11-24T22:41:28Z")
Hello everyone, @itascan I am facing an issue with my FLAC software. Whenever I open the application, it only shows a blank screen. Could you please advise how I can resolve this problem? Thank you. --- ## [Issue with History Data and Model Cycles in FLAC](https://forum.itascainternational.com/t/issue-with-history-data-and-model-cycles-in-flac/2355)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 6\ **Last updated:** [March 19, 2026, 1:39am UTC](https://forum.itascainternational.com/t/issue-with-history-data-and-model-cycles-in-flac/2355 "2026-03-19T01:39:22Z")
Hello everyone and @itascan @msepu @itascaYang I am currently facing an issue with my model. The model converges when I use model solve 1e-2. I have defined several history points to monitor parameters at different loca… --- ## [Boundary conditions for soil block](https://forum.itascainternational.com/t/boundary-conditions-for-soil-block/2379)
**Author:** [@William](https://forum.itascainternational.com/u/William)\ **Replies:** 1\ **Last updated:** [April 22, 2026, 4:08pm UTC](https://forum.itascainternational.com/t/boundary-conditions-for-soil-block/2379 "2026-04-22T16:08:15Z")
Hello I am currently working with the automatic remeshing feature in FLAC2D. I want to model a soil block and allow it to fail towards the left. However, I am unsure how to properly define boundary conditions in the … --- ## [Cable model grout-rock interface](https://forum.itascainternational.com/t/cable-model-grout-rock-interface/2272)
**Author:** [@Carlos\_Mora](https://forum.itascainternational.com/u/Carlos_Mora)\ **Replies:** 4\ **Last updated:** [November 20, 2025, 9:55am UTC](https://forum.itascainternational.com/t/cable-model-grout-rock-interface/2272 "2025-11-20T09:55:49Z")
Hello Itascans! We are seeking your help with the performance results of bolts installed in a shaft model. The cable model fails predominantly along the grout–rock interface, showing a pull-out type failure, while the b… --- ## [Relative between FLAC3D zone indexes and zonearray index](https://forum.itascainternational.com/t/relative-between-flac3d-zone-indexes-and-zonearray-index/2281)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 5\ **Last updated:** [November 21, 2025, 11:57am UTC](https://forum.itascainternational.com/t/relative-between-flac3d-zone-indexes-and-zonearray-index/2281 "2025-11-21T11:57:48Z")
Hi, I have questions about the relation between the ids of zones and faces within FLAC and the indexing in the python numpy interface: What is the relation between the index of zones and the indexing within zonearray… --- ## [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… --- ## [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… --- ## [(Apparent?) tensile rupture in joint with a hydrostatic model](https://forum.itascainternational.com/t/apparent-tensile-rupture-in-joint-with-a-hydrostatic-model/2285)
**Author:** [@Theophile](https://forum.itascainternational.com/u/Theophile)\ **Replies:** 6\ **Last updated:** [November 26, 2025, 7:54am UTC](https://forum.itascainternational.com/t/apparent-tensile-rupture-in-joint-with-a-hydrostatic-model/2285 "2025-11-26T07:54:24Z")
Hi everyone! Doing some tests on hydromechanics in 3DEC, I came up ith this situation I cannot explain: when considering pore pressure in joints (fluid not configured), I get tensile rupture even when specifying extreme… --- ## [Correct Way to Represent a Pumping Well in FLAC3D?](https://forum.itascainternational.com/t/correct-way-to-represent-a-pumping-well-in-flac3d/2306)
**Author:** [@Wenjie](https://forum.itascainternational.com/u/Wenjie)\ **Replies:** 2\ **Last updated:** [December 12, 2025, 1:26am UTC](https://forum.itascainternational.com/t/correct-way-to-represent-a-pumping-well-in-flac3d/2306 "2025-12-12T01:26:49Z")
Hello, I am simulating a pumping scenario, and my procedure is as follows: 1. I use a command to search for the grid points around the well (using range cylinder). Suppose the total number of selected grid points … --- ## [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… --- ## [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… --- ## [Direct shear test simulation in PFC](https://forum.itascainternational.com/t/direct-shear-test-simulation-in-pfc/2300)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 1\ **Last updated:** [December 5, 2025, 6:41pm UTC](https://forum.itascainternational.com/t/direct-shear-test-simulation-in-pfc/2300 "2025-12-05T18:41:52Z")
Respected Sir/Madam, I am trying to simulate Direct shear test and not getting force on y-displacement as the model is in 2D. Can anyone let me know what i am currently doin wrong in the model as I am attaching my code. … --- ## [Planarity in mesh generated with Griddle](https://forum.itascainternational.com/t/planarity-in-mesh-generated-with-griddle/2268)
**Author:** [@stephaneBeaussier](https://forum.itascainternational.com/u/stephaneBeaussier)\ **Replies:** 2\ **Last updated:** [January 20, 2026, 1:20pm UTC](https://forum.itascainternational.com/t/planarity-in-mesh-generated-with-griddle/2268 "2026-01-20T13:20:47Z")
Hi, I have recently started using Griddle for meshing. And I found that the mesh I generate have a bad planarity of zone faces compared to other generation methods (which makes sens in a way as Griddle is used to handle… --- ## [Zone groups not recognized properly after block merge](https://forum.itascainternational.com/t/zone-groups-not-recognized-properly-after-block-merge/2322)
**Author:** [@emegag](https://forum.itascainternational.com/u/emegag)\ **Replies:** 3\ **Last updated:** [January 26, 2026, 2:47pm UTC](https://forum.itascainternational.com/t/zone-groups-not-recognized-properly-after-block-merge/2322 "2026-01-26T14:47:00Z")
Hi all, I’m running into confusing behaviour with zone groups after block merge in 3DEC 9.0, and I’m trying to understand whether this is expected behaviour or a bug. I want to create two stacked blocks, merge them int… --- ## [Clumps made of rigid blocks](https://forum.itascainternational.com/t/clumps-made-of-rigid-blocks/2331)
**Author:** [@romaric.desbrousses](https://forum.itascainternational.com/u/romaric.desbrousses)\ **Replies:** 2\ **Last updated:** [February 18, 2026, 6:38pm UTC](https://forum.itascainternational.com/t/clumps-made-of-rigid-blocks/2331 "2026-02-18T18:38:59Z")
Hello, In one of my projects, I need to make clumps out of rigid blocks and have those clumps come into contact with regular rigid blocks. However, whenever I run my models, I get one of the following two problems: 1) e… --- ## [Difficulty with staged embankment construction using Modified Cam Clay in FLAC3D (yield envelope error)](https://forum.itascainternational.com/t/difficulty-with-staged-embankment-construction-using-modified-cam-clay-in-flac3d-yield-envelope-error/2376)
**Author:** [@Adams](https://forum.itascainternational.com/u/Adams)\ **Replies:** 2\ **Last updated:** [April 21, 2026, 7:48pm UTC](https://forum.itascainternational.com/t/difficulty-with-staged-embankment-construction-using-modified-cam-clay-in-flac3d-yield-envelope-error/2376 "2026-04-21T19:48:14Z")
I am attempting to simulate a compacted highway embankment in FLAC3D following the general framework for unsaturated hydro-mechanical behavior of compacted fill. My workflow involves staged construction of the embankment… --- ## [Flat joint contact model between rigid block](https://forum.itascainternational.com/t/flat-joint-contact-model-between-rigid-block/2294)
**Author:** [@romaric.desbrousses](https://forum.itascainternational.com/u/romaric.desbrousses)\ **Replies:** 1\ **Last updated:** [November 26, 2025, 6:40pm UTC](https://forum.itascainternational.com/t/flat-joint-contact-model-between-rigid-block/2294 "2025-11-26T18:40:58Z")
Hello, I am writing a code in which I am using the flat joint contact model to define interactions between rigid blocks. In a very simplified version of my code (provided at the end of this post), I create two rigid bl… --- ## [Ball Delete outside the required gemetery](https://forum.itascainternational.com/t/ball-delete-outside-the-required-gemetery/2320)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 1\ **Last updated:** [January 20, 2026, 5:06pm UTC](https://forum.itascainternational.com/t/ball-delete-outside-the-required-gemetery/2320 "2026-01-20T17:06:11Z")
I am trying to delete the ball are outside the wall which i have created and i am not able to do it after multiple option. How can I delete the balls. model new model large-strain on model title ‘Slope’ model domain … --- ## [Contacts disappear during meshing phase](https://forum.itascainternational.com/t/contacts-disappear-during-meshing-phase/2295)
**Author:** [@Theophile](https://forum.itascainternational.com/u/Theophile)\ **Replies:** 2\ **Last updated:** [December 1, 2025, 2:40pm UTC](https://forum.itascainternational.com/t/contacts-disappear-during-meshing-phase/2295 "2025-12-01T14:40:32Z")
Hi again, everyone! On another model, we have been facing difficulties getting a functional mesh: during meshing, some contacts “disappear”. We had to do some trial-and-error to get a mesh with the full contact set and… --- ## [Question on Developing Custom Joint Models in 3DEC 9](https://forum.itascainternational.com/t/question-on-developing-custom-joint-models-in-3dec-9/2374)
**Author:** [@sanhtra](https://forum.itascainternational.com/u/sanhtra)\ **Replies:** 2\ **Last updated:** [April 19, 2026, 1:59pm UTC](https://forum.itascainternational.com/t/question-on-developing-custom-joint-models-in-3dec-9/2374 "2026-04-19T13:59:36Z")
Dear Itasca Team, I am currently trying to implement a new joint constitutive model in 3DEC version 9 based on the manual. I opened the file example.sln located in ItascaSoftware900\\PluginFiles\\jmodels\\example using Vi… --- ## [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 … --- ## [Plotting disp-x relative to the bottom](https://forum.itascainternational.com/t/plotting-disp-x-relative-to-the-bottom/2358)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 2\ **Last updated:** [April 2, 2026, 7:33pm UTC](https://forum.itascainternational.com/t/plotting-disp-x-relative-to-the-bottom/2358 "2026-04-02T19:33:26Z")
How do I define an extra variable in FLAC v9 so I can plot x‑displacement relative to the base of the model? In FLAC v8 I used something like: ex\_30($iev, $jev) = xdisp($iev, $jev) - xdisp($iev, 1) What’s the equivalen… --- ## [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… --- ## [Heterogeneity in the properties of material of particles](https://forum.itascainternational.com/t/heterogeneity-in-the-properties-of-material-of-particles/2378)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 2\ **Last updated:** [April 21, 2026, 12:49pm UTC](https://forum.itascainternational.com/t/heterogeneity-in-the-properties-of-material-of-particles/2378 "2026-04-21T12:49:47Z")
I am working on slope modelling using the Voronoi block approach in 3DEC to represent a heterogeneous rock mass/overburden dump. I would like to assign different material properties to individual Voronoi blocks in order … --- ## [FLAC2D 8.1 Shell Element Issue](https://forum.itascainternational.com/t/flac2d-8-1-shell-element-issue/2356)
**Author:** [@New\_user](https://forum.itascainternational.com/u/New_user)\ **Replies:** 4\ **Last updated:** [March 23, 2026, 9:04pm UTC](https://forum.itascainternational.com/t/flac2d-8-1-shell-element-issue/2356 "2026-03-23T21:04:41Z")
I’m facing an error when I’m trying to solve the model. I created a axisynmetric model with a shell element. When I’m trying to solve the model, there is an error indicating me to assign the radius or perimeter for the… --- ## [Water Table Setting in FLAC2D 8.1](https://forum.itascainternational.com/t/water-table-setting-in-flac2d-8-1/2298)
**Author:** [@New\_user](https://forum.itascainternational.com/u/New_user)\ **Replies:** 2\ **Last updated:** [December 2, 2025, 5:43pm UTC](https://forum.itascainternational.com/t/water-table-setting-in-flac2d-8-1/2298 "2025-12-02T17:43:18Z")
How can I define a fixed groundwater table for an embankment slope in FLAC2D 8.1? --- ## [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 … --- ## [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… --- ## [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 … --- ## [Applying Distributed Load on Wall Facing in FLAC3D](https://forum.itascainternational.com/t/applying-distributed-load-on-wall-facing-in-flac3d/2372)
**Author:** [@Sudipta](https://forum.itascainternational.com/u/Sudipta)\ **Replies:** 2\ **Last updated:** [April 14, 2026, 6:58pm UTC](https://forum.itascainternational.com/t/applying-distributed-load-on-wall-facing-in-flac3d/2372 "2026-04-14T18:58:16Z")
Hi @everyone, @itascaYang @dafo407\_itasca @itasca I’m currently working on applying distributed (external) loading to a wall facing in FLAC3D v9, and I’m a bit unsure about the correct approach. Could anyone guide me o… --- ## [On the representation of normal displacements of curved contacts](https://forum.itascainternational.com/t/on-the-representation-of-normal-displacements-of-curved-contacts/2286)
**Author:** [@Theophile](https://forum.itascainternational.com/u/Theophile)\ **Replies:** 2\ **Last updated:** [November 24, 2025, 4:11pm UTC](https://forum.itascainternational.com/t/on-the-representation-of-normal-displacements-of-curved-contacts/2286 "2025-11-24T16:11:30Z")
Hi everyone ! That will be two posts in a row for me today :slight\_smile:. We study the impacts on considering irregular contacts in 3DEC. Thanks to the block merge commands, we can import meshes that were created usi… --- ## [Exporting Deformed Mesh](https://forum.itascainternational.com/t/exporting-deformed-mesh/2354)
**Author:** [@asabet](https://forum.itascainternational.com/u/asabet)\ **Replies:** 2\ **Last updated:** [March 24, 2026, 6:18pm UTC](https://forum.itascainternational.com/t/exporting-deformed-mesh/2354 "2026-03-24T18:18:59Z")
Is there a way to export the position of the deformed gridpoints without having to manually calculate it from displacements? --- ## [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 … --- ## [Model won't reach equilibrium along interfaces and top](https://forum.itascainternational.com/t/model-wont-reach-equilibrium-along-interfaces-and-top/2312)
**Author:** [@AdamL](https://forum.itascainternational.com/u/AdamL)\ **Replies:** 1\ **Last updated:** [January 8, 2026, 2:54pm UTC](https://forum.itascainternational.com/t/model-wont-reach-equilibrium-along-interfaces-and-top/2312 "2026-01-08T14:54:32Z")
My current model is in MC with standard properties, and I’ve been unable to get the model to solve. I’m currently just using ‘model solve’, but I’m not sure if this is an issue with the model setup, properties, or if I s… --- ## [Invalid elements in liner elements](https://forum.itascainternational.com/t/invalid-elements-in-liner-elements/2278)
**Author:** [@Carlos\_Mora](https://forum.itascainternational.com/u/Carlos_Mora)\ **Replies:** 2\ **Last updated:** [November 20, 2025, 4:58pm UTC](https://forum.itascainternational.com/t/invalid-elements-in-liner-elements/2278 "2025-11-20T16:58:39Z")
Hi Itascans, I have installed a lining in the excavation of a shaft (146 ft diameter) using liner elements; however, when checking the internal forces, none are calculated because it reports that I have many invalid elem… --- ## [Slope Instability and Boundary Detachment Issue in PFC Modeling](https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373)
**Author:** [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\ **Replies:** 2\ **Last updated:** [April 15, 2026, 12:36pm UTC](https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373 "2026-04-15T12:36:58Z")
During slope modeling in PFC, boundary balls are fixed to constrain the system. Despite this, the slope mass is separating from the boundary and moving into the domain. What could be causing this behavior, and how can it… --- ## [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… --- ## [3dec prestressed anchors](https://forum.itascainternational.com/t/3dec-prestressed-anchors/2370)
**Author:** [@mariyanD](https://forum.itascainternational.com/u/mariyanD)\ **Replies:** 1\ **Last updated:** [April 9, 2026, 7:59pm UTC](https://forum.itascainternational.com/t/3dec-prestressed-anchors/2370 "2026-04-09T19:59:40Z")
HI! When i try to prestress cable bolts in 3dec, i get the following error: FEMLine::SetLsys(): fail to define local coord. sys. While processing line 282 of source GUI Console I have run a model without tension appl… --- ## [Suppress pop up dialog](https://forum.itascainternational.com/t/suppress-pop-up-dialog/2330)
**Author:** [@JuDi](https://forum.itascainternational.com/u/JuDi)\ **Replies:** 2\ **Last updated:** [February 16, 2026, 8:59am UTC](https://forum.itascainternational.com/t/suppress-pop-up-dialog/2330 "2026-02-16T08:59:57Z")
Hi, is there a way to suppres these pop up dialogs when running a data file the change in state is not relevant in this context. Any hint appreciated. Julia --- ## [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… [Next page](https://forum.itascainternational.com/top.md?page=1&per_page=50)