# Modified Cam Clay Model

**URL:** <https://forum.itascainternational.com/t/modified-cam-clay-model/2245>\
**Category:** FLAC\
**Created:** [October 3, 2025, 5:53pm UTC](https://forum.itascainternational.com/t/modified-cam-clay-model/2245 "2025-10-03T17:53:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![New\_user](https://avatars.discourse-cdn.com/v4/letter/n/e19adc/32.png) [@New\_user](https://forum.itascainternational.com/u/New_user)\
**Post date:** [October 3, 2025, 5:53pm UTC](https://forum.itascainternational.com/t/modified-cam-clay-model/2245/1 "2025-10-03T17:53:28Z")

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I’m using FLAC2D.  
In my model, I consider the Modified Cam-Clay Model for clay.  
At the same time, I also have Mohr-Coulomb Model for sand.

I use some code from the example “isotropic consolidation modified cam caly”.  
If I use the provided fish functions to spefici initial mean effective pressure and preconsolidation pressure,  
Error: Property zone.prop not found in model mohr-coulomb.  
If I don’t use the provided fish functions,  
Error: Cam-clay: Mean effective pressure is negative.

What should I do?

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**Author:** ![jwang](https://avatars.discourse-cdn.com/v4/letter/j/b782af/32.png) [@jwang](https://forum.itascainternational.com/u/jwang)\
**Post date:** [October 6, 2025, 1:47pm UTC](https://forum.itascainternational.com/t/modified-cam-clay-model/2245/2 "2025-10-06T13:47:55Z")

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You can add a line of code and only assign values to those properties for Modified Cam-Clay zones.