# FLAC **URL:** https://forum.itascainternational.com/c/flac/7.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 --- ## [Coupling of FLAC3D v9 and PFC v7](https://forum.itascainternational.com/t/coupling-of-flac3d-v9-and-pfc-v7/1155)
**Author:** [@Mussie](https://forum.itascainternational.com/u/Mussie)\ **Replies:** 4\ **Last updated:** [March 18, 2025, 9:23am UTC](https://forum.itascainternational.com/t/coupling-of-flac3d-v9-and-pfc-v7/1155 "2025-03-18T09:23:45Z")
Dear ITASCA-Team, is coupling between FLAC3D v9 and PFC v7 still possible and are the examples from the documentation still applicable? Regards Mussie --- ## [Shear Induced Pore-Pressure](https://forum.itascainternational.com/t/shear-induced-pore-pressure/1937)
**Author:** [@stripathi](https://forum.itascainternational.com/u/stripathi)\ **Replies:** 0\ **Last updated:** [February 10, 2025, 8:20pm UTC](https://forum.itascainternational.com/t/shear-induced-pore-pressure/1937 "2025-02-10T20:20:30Z")
is there any built-in function in FLAC/FLAC2D/3D that calculates shear induced pore pressure due to construction loading? As far as my knowledge, when you apply construction loading to an existing embankment (for example… --- ## [FISH function for elastic modulus increment with depth](https://forum.itascainternational.com/t/fish-function-for-elastic-modulus-increment-with-depth/1915)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 4\ **Last updated:** [January 27, 2025, 8:27pm UTC](https://forum.itascainternational.com/t/fish-function-for-elastic-modulus-increment-with-depth/1915 "2025-01-27T20:27:15Z")
Hi all, I’d like to initialize a non linear distribution of elastic moduli in my FLAC slope model. In particular, I would like to vary the moduli according to the depth from the ground level considering a the top left-h… --- ## [Problem with calibrating modulus degradation curve](https://forum.itascainternational.com/t/problem-with-calibrating-modulus-degradation-curve/1907)
**Author:** [@horacelo](https://forum.itascainternational.com/u/horacelo)\ **Replies:** 2\ **Last updated:** [January 23, 2025, 8:19am UTC](https://forum.itascainternational.com/t/problem-with-calibrating-modulus-degradation-curve/1907 "2025-01-23T08:19:11Z")
Hello everyone, I am currently calibrating the modulus degradation curve to a published curve, using the sigmoidal-3 model. Using the provided one-zone code in FLAC3D (One-Zone Sample Exercised at Several Cyclic Strai… --- ## [How to extract the results to excel (such as stress and deformation of a specific line or face of the model)?](https://forum.itascainternational.com/t/how-to-extract-the-results-to-excel-such-as-stress-and-deformation-of-a-specific-line-or-face-of-the-model/1896)
**Author:** [@New\_user](https://forum.itascainternational.com/u/New_user)\ **Replies:** 2\ **Last updated:** [January 16, 2025, 7:30pm UTC](https://forum.itascainternational.com/t/how-to-extract-the-results-to-excel-such-as-stress-and-deformation-of-a-specific-line-or-face-of-the-model/1896 "2025-01-16T19:30:33Z")
Take this graph as an example, there are two lines. One is horizontal and the other is vertical. The location is given. How to extract the results? I want to extract the stresses of the elements on the lines to the Exc… --- ## [Results of a line](https://forum.itascainternational.com/t/results-of-a-line/1872)
**Author:** [@New\_user](https://forum.itascainternational.com/u/New_user)\ **Replies:** 2\ **Last updated:** [January 14, 2025, 5:32am UTC](https://forum.itascainternational.com/t/results-of-a-line/1872 "2025-01-14T05:32:41Z")
Are there any ways to extract the results such as stress and displacement of a line in the model? --- ## [Problems with yielded in past zones](https://forum.itascainternational.com/t/problems-with-yielded-in-past-zones/1885)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 2\ **Last updated:** [January 13, 2025, 6:46pm UTC](https://forum.itascainternational.com/t/problems-with-yielded-in-past-zones/1885 "2025-01-13T18:46:16Z")
Hello everyone, I’m using FLAC 2D v.8 to model a slope. I’m attempting to input n.4 joints in my model using decreased mechanical parameters than the ones that describe the rock matrix. Even though it has been used in … --- ## [How to search a zone by zone ID?](https://forum.itascainternational.com/t/how-to-search-a-zone-by-zone-id/1875)
**Author:** [@New\_user](https://forum.itascainternational.com/u/New_user)\ **Replies:** 1\ **Last updated:** [January 3, 2025, 10:29am UTC](https://forum.itascainternational.com/t/how-to-search-a-zone-by-zone-id/1875 "2025-01-03T10:29:07Z")
How to search a zone by zone ID? --- ## [I don't know why I can't open FLAC2D 9.0 since yesterday](https://forum.itascainternational.com/t/i-dont-know-why-i-cant-open-flac2d-9-0-since-yesterday/1841)
**Author:** [@New\_user](https://forum.itascainternational.com/u/New_user)\ **Replies:** 5\ **Last updated:** [December 11, 2024, 3:13am UTC](https://forum.itascainternational.com/t/i-dont-know-why-i-cant-open-flac2d-9-0-since-yesterday/1841 "2024-12-11T03:13:01Z")
I don’t know why I can’t open FLAC2D 9.0. I double-clicked the app, but the software didn’t open. --- ## [Hysteretic damping based on Darendeli](https://forum.itascainternational.com/t/hysteretic-damping-based-on-darendeli/243)
**Author:** [@IoAnton](https://forum.itascainternational.com/u/IoAnton)\ **Replies:** 2\ **Last updated:** [November 29, 2024, 7:16am UTC](https://forum.itascainternational.com/t/hysteretic-damping-based-on-darendeli/243 "2024-11-29T07:16:55Z")
Is there a way using fish to apply hysteretic damping, based on the Darendeli equations, which is dependent on the overburden (or on the confining) stress? --- ## [FISH function for plasticity state](https://forum.itascainternational.com/t/fish-function-for-plasticity-state/1786)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 9\ **Last updated:** [November 6, 2024, 10:48pm UTC](https://forum.itascainternational.com/t/fish-function-for-plasticity-state/1786 "2024-11-06T22:48:44Z")
Hi all, Using FLAC v.8, I am trying to write a fish function to associate zero cohesion and tensile values to all the zones “currently at yield in shear and/or volume” (i.e., state = 1) or “currently at yield in tension… --- ## [Applied stress in a creep analysis](https://forum.itascainternational.com/t/applied-stress-in-a-creep-analysis/1781)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 2\ **Last updated:** [November 1, 2024, 7:08pm UTC](https://forum.itascainternational.com/t/applied-stress-in-a-creep-analysis/1781 "2024-11-01T19:08:26Z")
Hi all, I’m performing a creep analysis in which I’d like to apply a series of nstress on a wall. Each applied nstress has to be applied on the wall for only 1 second. Premise: I’m not performing a dynamic analysis bec… --- ## [FISH script for wet density un FLAC 2D](https://forum.itascainternational.com/t/fish-script-for-wet-density-un-flac-2d/1765)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 2\ **Last updated:** [October 21, 2024, 3:18pm UTC](https://forum.itascainternational.com/t/fish-script-for-wet-density-un-flac-2d/1765 "2024-10-21T15:18:26Z")
Hi all, I set up a water table in my script (I’m using FLAC 2D v.8). When I apply a water table in a static analysis (i.e. without groundwater flow), I have to specify the saturated densities of the submerged materials… --- ## ["ssi" in plot item/FISH zone varaible](https://forum.itascainternational.com/t/ssi-in-plot-item-fish-zone-varaible/100)
**Author:** [@jwang](https://forum.itascainternational.com/u/jwang)\ **Replies:** 4\ **Last updated:** [October 16, 2024, 2:00pm UTC](https://forum.itascainternational.com/t/ssi-in-plot-item-fish-zone-varaible/100 "2024-10-16T14:00:04Z")
The name is somewhat misleading. ‘ssi: shear strain increment’ is just ‘total shear strain’ . What it means is the increment in shear strain since the last time displacements were set to 0… --- ## [Finn Model - ff\_latency parameter estimation](https://forum.itascainternational.com/t/finn-model-ff-latency-parameter-estimation/1718)
**Author:** [@MiguelN](https://forum.itascainternational.com/u/MiguelN)\ **Replies:** 1\ **Last updated:** [September 30, 2024, 5:24pm UTC](https://forum.itascainternational.com/t/finn-model-ff-latency-parameter-estimation/1718 "2024-09-30T17:24:37Z")
Hi everyone. Question. For Finn Model, in dynamic analysis, how is the best practice to calculates or defines the ff\_latency parameter in a seismic analysis? Thanks in advance. --- ## [Slope analysis with different mesh resolution](https://forum.itascainternational.com/t/slope-analysis-with-different-mesh-resolution/1700)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 3\ **Last updated:** [September 19, 2024, 3:26pm UTC](https://forum.itascainternational.com/t/slope-analysis-with-different-mesh-resolution/1700 "2024-09-19T15:26:20Z")
Hello Itascans, I would like to represent a slope using a different mesh resolution in FLAC v.8. The domain must be very large, as the slope being analysed is 2700m long and 700m high. As can be seen from this sketch, I… --- ## [Problem with tensile strenght assignment in FLAC 8.0](https://forum.itascainternational.com/t/problem-with-tensile-strenght-assignment-in-flac-8-0/1549)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 5\ **Last updated:** [June 27, 2024, 2:58pm UTC](https://forum.itascainternational.com/t/problem-with-tensile-strenght-assignment-in-flac-8-0/1549 "2024-06-27T14:58:44Z")
Hi all, I’m setting up a thermo-mechanical analysis in FLAC 8.0 for the study of a slope. I’ve ran a first elastic solve (VT\_j\_el.sav) considering an unbalanced force of 0.01N. Now it’s time for the rheological model … --- ## [Coupling spring properties for piles in liquefiable sand](https://forum.itascainternational.com/t/coupling-spring-properties-for-piles-in-liquefiable-sand/1470)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 1\ **Last updated:** [May 26, 2024, 9:21pm UTC](https://forum.itascainternational.com/t/coupling-spring-properties-for-piles-in-liquefiable-sand/1470 "2024-05-26T21:21:40Z")
I’m having a tough time matching p\_ult (in flac it is Fsmax/L) using only the frictional component with c\_s = 0. If I only use the frictional term with c\_s = 0 then the calculated p\_ult is an order of magnitude smaller t… --- ## [Dynamic analysis in FLAC](https://forum.itascainternational.com/t/dynamic-analysis-in-flac/1445)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 1\ **Last updated:** [May 8, 2024, 2:44pm UTC](https://forum.itascainternational.com/t/dynamic-analysis-in-flac/1445 "2024-05-08T14:44:26Z")
Hi Itascans, I’d like to perform a dynamic analysis in FLAC (considering applied stress time series). What is the maximum duration of the time series that I can input in the code? For example, 1 hour is allowed? Than… --- ## ["Step" command in FLAC](https://forum.itascainternational.com/t/step-command-in-flac/1429)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 5\ **Last updated:** [April 26, 2024, 2:57pm UTC](https://forum.itascainternational.com/t/step-command-in-flac/1429 "2024-04-26T14:57:56Z")
Hi to all, I’m performing a slope stability analysis in FLAC 8.0 in which I’d like to replicate the dynamic action related to a water wave impact on the slope. The idea is to use the function apply sxx along the (i,j)-c… --- ## [Pushover analysis in FLAC](https://forum.itascainternational.com/t/pushover-analysis-in-flac/1414)
**Author:** [@agapanto](https://forum.itascainternational.com/u/agapanto)\ **Replies:** 3\ **Last updated:** [April 26, 2024, 9:19am UTC](https://forum.itascainternational.com/t/pushover-analysis-in-flac/1414 "2024-04-26T09:19:56Z")
Hi to all, I would like to advance a so-called “pushover analysis” using FLAC 8. In particular, I’m performing a slope stability analysis in which I’d like to replicate the dynamic action related to a water wave impact… --- ## [Modeling inelastic wall with beam element in FLAC2D](https://forum.itascainternational.com/t/modeling-inelastic-wall-with-beam-element-in-flac2d/1258)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 12\ **Last updated:** [April 24, 2024, 1:31pm UTC](https://forum.itascainternational.com/t/modeling-inelastic-wall-with-beam-element-in-flac2d/1258 "2024-04-24T13:31:24Z")
I have modeled a bulkhead wall with beam elements and assigned plastic moments. Tracking the bending moment during the seismic shaking shows that in some elements the bending moment reached the plastic moment capacity bu… --- ## [Plot the PP vs gwtime for one gridpoint](https://forum.itascainternational.com/t/plot-the-pp-vs-gwtime-for-one-gridpoint/1330)
**Author:** [@Derek](https://forum.itascainternational.com/u/Derek)\ **Replies:** 1\ **Last updated:** [February 21, 2024, 2:42pm UTC](https://forum.itascainternational.com/t/plot-the-pp-vs-gwtime-for-one-gridpoint/1330 "2024-02-21T14:42:32Z")
Hi Flac support team, I would like to plot the variation of the PWP for one gridpoint (e.g., (1,1) versus the gwtime, but I forget to add the command "history pp i=1 j=1’’ in the calcuation file. The “history gwtime” ha… --- ## [Change the format of the colour scale in FLAC2D output contour](https://forum.itascainternational.com/t/change-the-format-of-the-colour-scale-in-flac2d-output-contour/1332)
**Author:** [@Derek](https://forum.itascainternational.com/u/Derek)\ **Replies:** 0\ **Last updated:** [February 21, 2024, 12:01pm UTC](https://forum.itascainternational.com/t/change-the-format-of-the-colour-scale-in-flac2d-output-contour/1332 "2024-02-21T12:01:05Z")
Hi, I wonder if it is possible in FLAC2D to change the format of the contour label in the red circle to the two examples below, which is horizontal or vertical and with less decimal. Thanks! --- ## [Exaggerate plot in vertical direction only](https://forum.itascainternational.com/t/exaggerate-plot-in-vertical-direction-only/1301)
**Author:** [@Milads](https://forum.itascainternational.com/u/Milads)\ **Replies:** 1\ **Last updated:** [January 18, 2024, 9:25pm UTC](https://forum.itascainternational.com/t/exaggerate-plot-in-vertical-direction-only/1301 "2024-01-18T21:25:49Z")
I have a very long profile in FLAC2d and I was wondering if there is any way to scale contour plots in the vertical direction only and not scaling both axes. Thanks, --- ## [Hydraulic boundary condition for the staged construction of tailings dams](https://forum.itascainternational.com/t/hydraulic-boundary-condition-for-the-staged-construction-of-tailings-dams/1228)
**Author:** [@Derek](https://forum.itascainternational.com/u/Derek)\ **Replies:** 1\ **Last updated:** [October 27, 2023, 2:20pm UTC](https://forum.itascainternational.com/t/hydraulic-boundary-condition-for-the-staged-construction-of-tailings-dams/1228 "2023-10-27T14:20:54Z")
Hi All, I am running the analysis for the staged construction of tailings dams. After adding each new tailings layer, as shown in the attached figure, I will free the PP at the bottom of the newly added tailings layer… --- ## [Error: \*\*\*both elastic modulii zero in at lease one zone](https://forum.itascainternational.com/t/error-both-elastic-modulii-zero-in-at-lease-one-zone/1178)
**Author:** [@Derek](https://forum.itascainternational.com/u/Derek)\ **Replies:** 7\ **Last updated:** [September 21, 2023, 3:34pm UTC](https://forum.itascainternational.com/t/error-both-elastic-modulii-zero-in-at-lease-one-zone/1178 "2023-09-21T15:34:18Z")
Hi everyone, I am running the stability analysis for a staged construction of tailings dam, I used NorSand model for tailings and clay. At the end of construction, I switched the NorSand of Tailings and Clay to Mohr-Cou… --- ## [Stability analysis after the flow-mechanical coupled analysis with NorSand](https://forum.itascainternational.com/t/stability-analysis-after-the-flow-mechanical-coupled-analysis-with-norsand/1170)
**Author:** [@Derek](https://forum.itascainternational.com/u/Derek)\ **Replies:** 2\ **Last updated:** [September 12, 2023, 3:09pm UTC](https://forum.itascainternational.com/t/stability-analysis-after-the-flow-mechanical-coupled-analysis-with-norsand/1170 "2023-09-12T15:09:43Z")
Hi, I have conducted a fully coupled flow-mechanical analysis by using NorSand for tailings during the construction stages. At the end of the construciton, I would like to run a stablity analysis for the tailings dams, … --- ## [Error while Creating User-Written Model DLLs](https://forum.itascainternational.com/t/error-while-creating-user-written-model-dlls/1164)
**Author:** [@SamVarun10](https://forum.itascainternational.com/u/SamVarun10)\ **Replies:** 1\ **Last updated:** [September 11, 2023, 2:42pm UTC](https://forum.itascainternational.com/t/error-while-creating-user-written-model-dlls/1164 "2023-09-11T14:42:41Z")
Hello I am new to FLAC. I recently tried to perform the procedure needed to be adopted to use C++ UDM for FLAC 8.0 I installed VS2015(as VS2010 is unavailable) and tried to run the basic Constitutive Model. But I g… --- ## [Question for Unit of Structure load](https://forum.itascainternational.com/t/question-for-unit-of-structure-load/1149)
**Author:** [@PeterLee](https://forum.itascainternational.com/u/PeterLee)\ **Replies:** 2\ **Last updated:** [August 29, 2023, 11:19pm UTC](https://forum.itascainternational.com/t/question-for-unit-of-structure-load/1149 "2023-08-29T23:19:29Z")
Hi All~ Just I have a question for Unit of Structure node. As you know, when we apply any force on Structure elements, we use node command like below. ‘Structure node n load fx fy mom’ in this case, what is unit for … [Previous page](https://forum.itascainternational.com/c/flac/7.md) [Next page](https://forum.itascainternational.com/c/flac/7.md?page=2)