# Slope Instability and Boundary Detachment Issue in PFC Modeling

**URL:** <https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373>\
**Category:** PFC\
**Created:** [April 10, 2026, 6:20am UTC](https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373 "2026-04-10T06:20:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ShivamPandey](https://avatars.discourse-cdn.com/v4/letter/s/f4b2a3/32.png) [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\
**Post date:** [April 10, 2026, 6:20am UTC](https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373/1 "2026-04-10T06:20:49Z")

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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 be corrected?

[tr.txt](https://forum.itascainternational.com/uploads/short-url/nOgiURga7Jhu1OdjMdAf48NIdVe.txt) (3.8 KB)

[parallel\_bonded.dat](https://forum.itascainternational.com/uploads/short-url/aTI3JSWiQzeGO0vHjYfBY7KUnMz.dat) (1.4 KB)

> **[40degree1bench.stl](https://drive.google.com/file/d/1yuNe_52Ffx-DspCepqRBpNRHtA0wMh2q/view?usp=sharing)**
>
> Google Drive file.

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**Author:** ![ShivamPandey](https://avatars.discourse-cdn.com/v4/letter/s/f4b2a3/32.png) [@ShivamPandey](https://forum.itascainternational.com/u/ShivamPandey)\
**Post date:** [April 15, 2026, 6:49am UTC](https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373/2 "2026-04-15T06:49:58Z")

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Respected sir,

Please kindly look into these problem @dpotyondy and I will be eagerly waiting for the response.

Thankyou,

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**Author:** ![dpotyondy](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.itascainternational.com/dpotyondy/32/1399_2.png) [@dpotyondy](https://forum.itascainternational.com/u/dpotyondy)\
**Post date:** [April 15, 2026, 12:36pm UTC](https://forum.itascainternational.com/t/slope-instability-and-boundary-detachment-issue-in-pfc-modeling/2373/3 "2026-04-15T12:36:58Z")

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Dear Shivam, I cannot provide free support to debug your data file. If you want me to do this, then you need to prepare a very simple model along with a short slide set that clearly describes what exactly is the problem, and then I can take a look. Cheers, —David Potyondy