GeoXPM Forum - Recent Topics https://geoxpm.com/community/ GeoXPM Discussion Board en-US Sun, 08 Mar 2026 04:27:26 +0000 wpForo 60 3D terrain integration https://geoxpm.com/community/geoxsph/3d-terrain-integration/ Mon, 19 Jan 2026 11:28:42 +0000 I have the DEM's of pre and the post event. But to slice the pre dem stl from the post dem stl, is it necessary that the DEM's should have thickness like the one given in GeoXPM tutorial. Can i cut the dem's directly in the GeoXPM without having the thicknesses in the stl file. Or is there any other way, please help me out. 
Also, if we obtained the sliding mass and the stationary object then how we are going to flow that sliding mass over the terrain, because the tutorial present in the site doesn't mention anything about this.
Please help me.......

]]> Tanishq09 https://geoxpm.com/community/geoxsph/3d-terrain-integration/ Problem generating particles correctly for tunnel excavation (2D simulation) https://geoxpm.com/community/general/problem-generating-particles-correctly-for-tunnel-excavation-2d-simulation/ Mon, 10 Nov 2025 00:26:59 +0000 Hello everyone,
I’m trying to simulate a 2D tunnel excavation following the 3D Excavation Tutorial as a reference, but I’m adapting it for a 2D case.

Here’s what I did:

  1. I created a cube to represent the soil domain.

  2. Following Step 2(c) of the tutorial, I created a cylinder inside the cube and used the Slice apart function to separate the soil and the tunnel zone.

  3. Then, I added a FillBox ensuring that it covers the entire cylinder, with the FillPoint exactly at the center, where the 2D simulation domain passes.

  4. In the GeoXPM tab, I enabled Autofill only for the soil domain, and disabled it for the cylinder (which represents the tunnel to be excavated later), as shown in the tutorial.

However, when I generate the particles, only the particles along the boundary of the cylinder are generated, and the interior remains empty.
I tried activating Autofill for the cylinder as well, and in that case, the particles are generated correctly, but when I run the simulation, the timestep becomes infinite and the simulation fails.

So, I’m not sure what’s going wrong.

Any help or suggestions would be greatly appreciated. I’m just trying to adapt the tutorial for a simple 2D tunnel excavation case.

Thanks in advance!

]]> joao.vieira https://geoxpm.com/community/general/problem-generating-particles-correctly-for-tunnel-excavation-2d-simulation/ Drucker prager softening https://geoxpm.com/community/general/drucker-prager-softening/ Thu, 19 Jun 2025 11:11:56 +0000 May i know what is the formulation or the criterion used by Geoxpm for drucker prager softening, especially for the coefficient a and b.

]]> madelestin https://geoxpm.com/community/general/drucker-prager-softening/ How can I export the time-varying force acting on a specified object, such as a simulatedrigid barrier in GeoXPM? https://geoxpm.com/community/geoxsph/how-can-i-export-the-time-varying-force-acting-on-a-specified-object-such-as-a-simulatedrigid-barrier-in-geoxpm/ Tue, 03 Jun 2025 10:49:35 +0000 How can I export the time-varying force 

]]> DamDucHung_huce_66 https://geoxpm.com/community/geoxsph/how-can-i-export-the-time-varying-force-acting-on-a-specified-object-such-as-a-simulatedrigid-barrier-in-geoxpm/ GeoXPM output tutorial https://geoxpm.com/community/general/geoxpm-output-tutorial/ Mon, 02 Jun 2025 11:56:57 +0000 Hello, i am new to Geoxpm but i would like to explore the output that can be withdrawn from Geoxpm. Is there any possible tutorial to use the output?

I am interested in knowing the deformation of soil in each steps and/or time rate and the other possibilities it possibly can

]]> madelestin https://geoxpm.com/community/general/geoxpm-output-tutorial/ Is it possible to model or simulate the effect of water / rainfall for soil displacement https://geoxpm.com/community/smoothed-particle-hydrodynamics/is-it-possible-to-model-or-simulate-the-effect-of-water-rainfall-for-soil-displacement/ Tue, 22 Apr 2025 07:08:50 +0000 i would like to explore more regarding the effect of rainfall towards soil displacement; both saturated and unsaturated soil. However, I could not find any input regarding the water whether it is the saturation or the effect into soil (ex: seepage, permeability)

]]> madelestin https://geoxpm.com/community/smoothed-particle-hydrodynamics/is-it-possible-to-model-or-simulate-the-effect-of-water-rainfall-for-soil-displacement/ 3D model PROBLEM https://geoxpm.com/community/geoxsph/3d-model-problem/ Mon, 20 Jan 2025 17:02:59 +0000 Dear All,

I am writing this post to report some issues I am experiencing with 3D modeling using GEOXPM. I simulated two slopes using both 2D and 3D modeling. Please note that I am analyzing a planar problem; the 3D modeling was performed solely to assess the computational burden of using this simulation methodology.

I successfully resolved the 2D problem with excellent results. However, when attempting to model the problem in 3D, I encountered several errors, which I have attached to this post for reference. I suspect that the issues might be related to the constraints applied to the "FRONT" and "BACK" boundaries.

Has anyone faced similar problems or could provide guidance on how to resolve them?

Thank you in advance for your assistance.

Best regards

]]> Pietro Mazzuca https://geoxpm.com/community/geoxsph/3d-model-problem/ how can I get a collaborative version https://geoxpm.com/community/general/how-can-i-get-a-collaborative-version/ Tue, 31 Dec 2024 07:20:55 +0000 Hello, as a student, how can I get a collaborative version

]]> Xiaoyan https://geoxpm.com/community/general/how-can-i-get-a-collaborative-version/ soil-structure interaction https://geoxpm.com/community/general/soil-structure-interaction/ Tue, 16 Jul 2024 04:26:00 +0000 Does the current version of GeoXPM support the simulation of soil-structure interaction? The scenario I'm trying to simulate is the moving of wheels or tracks on sands. I have noticed similar animations on Youtube, but it seems that the current version does not provide examples.

]]> Xyp66201 https://geoxpm.com/community/general/soil-structure-interaction/ When I run, the output is only the boundary particles. How to solve it ? https://geoxpm.com/community/geoxsph/when-i-run-the-output-is-only-the-boundary-particles-how-to-solve-it/ Tue, 07 May 2024 14:16:56 +0000  

当前时间步数 = 5200 当前时间 = 9.114103
____________________________________________________________________________
>> 统计：每个粒子的相互作用：
**** 激活粒子总数： 0
**** 粒子： 8253 最大相互作用： 0
**** 粒子： 1 最小相互作用： 0
**** 平均值： 0.0000000E+00
**** 总对数： 0
**** 没有相互作用的粒子： 8253
**** 时间步长为： 1.752712184016532E-003
_______________________________________________________________________
当前时间步数= 5400 当前时间= 9.464645
______________________________________________________________________
>> 统计数据：每个粒子的相互作用：
**** 激活粒子总数： 0
**** 粒子： 8253 最大相互作用： 0
**** 粒子： 1 最小相互作用： 0
** ** 平均值：0.0000000E+00
**** 总对：0
**** 无相互作用的粒子：8253
**** 时间步长为：1.752712184016532E-003

]]> pipiqiu311 https://geoxpm.com/community/geoxsph/when-i-run-the-output-is-only-the-boundary-particles-how-to-solve-it/