# Latest **URL:** https://forum.itascainternational.com/latest.md?page=1 [Latest](https://forum.itascainternational.com/latest.md) · [Categories](https://forum.itascainternational.com/categories.md) · [Tags](https://forum.itascainternational.com/tags.md) **Page:** 2 --- ## [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 … --- ## [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… --- ## [Zone Maximum Shear Strain Increment in Flac2D](https://forum.itascainternational.com/t/zone-maximum-shear-strain-increment-in-flac2d/2232)
**Author:** [@Miguel\_S](https://forum.itascainternational.com/u/Miguel_S)\ **Replies:** 5\ **Last updated:** [April 21, 2026, 2:24pm UTC](https://forum.itascainternational.com/t/zone-maximum-shear-strain-increment-in-flac2d/2232 "2026-04-21T14:24:03Z")
I am modeling a seismic site response analysis in FLAC2D, applying only the horizontal component of ground motion at the base. In the results, I can see the plot Maximum Shear Strain Increment, which I understand corresp… --- ## [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 … --- ## [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… --- ## [Delete zone/gridpoints extra](https://forum.itascainternational.com/t/delete-zone-gridpoints-extra/965)
**Author:** [@Carlos\_Mora](https://forum.itascainternational.com/u/Carlos_Mora)\ **Replies:** 9\ **Last updated:** [April 17, 2026, 5:11pm UTC](https://forum.itascainternational.com/t/delete-zone-gridpoints-extra/965 "2026-04-17T17:11:25Z")
Hello, I am trying to delete zone and gridpoints information stored in extra variables in order to get the file slighter but I do not find a Fish or FLAC command to achieve that, any help? Thank you in advance. --- ## [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… --- ## [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… --- ## [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… --- ## [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… --- ## [Plastic hinge formation in Liner element](https://forum.itascainternational.com/t/plastic-hinge-formation-in-liner-element/2360)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 1\ **Last updated:** [April 2, 2026, 7:18pm UTC](https://forum.itascainternational.com/t/plastic-hinge-formation-in-liner-element/2360 "2026-04-02T19:18:38Z")
I am modeling a sheet pile wall using liner elements in FLAC v9.6. Currently, I have assigned an elastic model to these elements, but I would like to know how to specify a plastic moment capacity so that a plastic hinge … --- ## [Benchmark Test, Dual CPU, Low performance](https://forum.itascainternational.com/t/benchmark-test-dual-cpu-low-performance/1163)
**Author:** [@cgulenc](https://forum.itascainternational.com/u/cgulenc)\ **Replies:** 9\ **Last updated:** [April 2, 2026, 6:19pm UTC](https://forum.itascainternational.com/t/benchmark-test-dual-cpu-low-performance/1163 "2026-04-02T18:19:12Z")
Hi, I made some static and dynamic analyses of an embankment and a benchmark test eventually. The results are not satisfactory. I believe that there is a problem, but I cannot understand. I need some help. I prepared a … --- ## [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… --- ## [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? --- ## [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… --- ## [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… --- ## [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… --- ## [Examples for Coupling of UDEC/3DEC and FLAC/FLAC3D](https://forum.itascainternational.com/t/examples-for-coupling-of-udec-3dec-and-flac-flac3d/836)
**Author:** [@xiongyu](https://forum.itascainternational.com/u/xiongyu)\ **Replies:** 16\ **Last updated:** [March 2, 2026, 3:59pm UTC](https://forum.itascainternational.com/t/examples-for-coupling-of-udec-3dec-and-flac-flac3d/836 "2026-03-02T15:59:57Z")
Is there any examples (codes) for coupling of UDEC/3DEC and FLAC/FLAC3D? --- ## [Bulkhead wall modeling](https://forum.itascainternational.com/t/bulkhead-wall-modeling/2332)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 0\ **Last updated:** [February 20, 2026, 6:20pm UTC](https://forum.itascainternational.com/t/bulkhead-wall-modeling/2332 "2026-02-20T18:20:05Z")
I am planning to model a bulkhead wall on a slope using FLAC v9, and I’ve noticed that there are two possible structural elements to represent the wall. In previous projects, I used beam elements, but the FLAC manual als… --- ## [Output contour values via profile](https://forum.itascainternational.com/t/output-contour-values-via-profile/799)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 2\ **Last updated:** [February 19, 2026, 3:46pm UTC](https://forum.itascainternational.com/t/output-contour-values-via-profile/799 "2026-02-19T15:46:01Z")
A simple way is creating a profile (Plot-\>profile), select the item to create(e.g. xdisp ) and draw a line along the top surface, and then create a profile, in the profile window, right click on the plot, press ‘view dat… --- ## [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… --- ## [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 --- ## [Compression Strength for Shell elements](https://forum.itascainternational.com/t/compression-strength-for-shell-elements/2313)
**Author:** [@MiguelN](https://forum.itascainternational.com/u/MiguelN)\ **Replies:** 1\ **Last updated:** [February 12, 2026, 9:32pm UTC](https://forum.itascainternational.com/t/compression-strength-for-shell-elements/2313 "2026-02-12T21:32:26Z")
Is it possible to limit the compressive strength of shell elements in order to define fc′​ for concrete simulation? Using the MC model for shell elements, the shear strength and tensile strength can be limited; however,… --- ## [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… --- ## [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… --- ## [Mismatch of Displacement Input in Dynamic Analysis](https://forum.itascainternational.com/t/mismatch-of-displacement-input-in-dynamic-analysis/1820)
**Author:** [@JonathasBB](https://forum.itascainternational.com/u/JonathasBB)\ **Replies:** 10\ **Last updated:** [January 26, 2026, 5:03am UTC](https://forum.itascainternational.com/t/mismatch-of-displacement-input-in-dynamic-analysis/1820 "2026-01-26T05:03:17Z")
Hi Everyone and @itascan. I am currently working on modeling a dynamic analysis of a tailings dam. I am performing some verifications to validate the model, and one of them is to verify if the input ground motion matche… --- ## [What hardware do Itasca consultants use to run Itasca software?](https://forum.itascainternational.com/t/what-hardware-do-itasca-consultants-use-to-run-itasca-software/142)
**Author:** [@ddegagne](https://forum.itascainternational.com/u/ddegagne)\ **Replies:** 9\ **Last updated:** [January 23, 2026, 6:11am UTC](https://forum.itascainternational.com/t/what-hardware-do-itasca-consultants-use-to-run-itasca-software/142 "2026-01-23T06:11:10Z")
Itasca Consulting Group engineers run their models on “crunchers,” which are powerful PC computers. Our IT team currently (as of October 2021) defines the following system configurations as crunchers. These are only gene… --- ## [Is there any way to apply acceleration history to structural nodes?](https://forum.itascainternational.com/t/is-there-any-way-to-apply-acceleration-history-to-structural-nodes/742)
**Author:** [@ppk](https://forum.itascainternational.com/u/ppk)\ **Replies:** 2\ **Last updated:** [January 22, 2026, 12:03pm UTC](https://forum.itascainternational.com/t/is-there-any-way-to-apply-acceleration-history-to-structural-nodes/742 "2026-01-22T12:03:23Z")
I’m trying to find natural period of structures constructed with beam and shell elements. Sweeping test which applies sinusoidal waves with increasing frequencies is planned but I can’t find any way to apply (displaceme… --- ## [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 --- ## [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… [Previous page](https://forum.itascainternational.com/latest.md) [Next page](https://forum.itascainternational.com/latest.md?page=2)