# Undrained strength ratio with strain softening

**URL:** <https://forum.itascainternational.com/t/undrained-strength-ratio-with-strain-softening/624>\
**Category:** FLAC\
**Created:** [June 20, 2022, 1:59pm UTC](https://forum.itascainternational.com/t/undrained-strength-ratio-with-strain-softening/624 "2022-06-20T13:59:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Gian](https://avatars.discourse-cdn.com/v4/letter/g/f19dbf/32.png) [@Gian](https://forum.itascainternational.com/u/Gian)\
**Post date:** [June 20, 2022, 1:59pm UTC](https://forum.itascainternational.com/t/undrained-strength-ratio-with-strain-softening/624/1 "2022-06-20T13:59:41Z")

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Hello guys,

I understand that the strain-softening (SS) model uses tables to describe post-peak strength and that the number of tables could be limited. Would you think in any way of considering spatially variable properties using SS?

Best,

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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:** [June 23, 2022, 1:32pm UTC](https://forum.itascainternational.com/t/undrained-strength-ratio-with-strain-softening/624/2 "2022-06-23T13:32:18Z")

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Is the post-peak strength depth dependent? If yes, you can create a table with x either equals to y coordinate or depth, and y equals to post-peak strength. Write a fish function and loop the zones, and then assign the post-peak value based on the ycen() of the zone. If the post-peak strength is x and y coordinates dependent, you can create a file, each row contains x, y, and post-peak, and then write a fish code and use read(), array, and cparse() to extract the post-peak value from the file and assign the value to the zone.

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**Author:** ![Gian](https://avatars.discourse-cdn.com/v4/letter/g/f19dbf/32.png) [@Gian](https://forum.itascainternational.com/u/Gian)\
**Post date:** [June 24, 2022, 2:03pm UTC](https://forum.itascainternational.com/t/undrained-strength-ratio-with-strain-softening/624/3 "2022-06-24T14:03:14Z")

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thank you, Jin. So you mean creating as much tables as necessary to populate my grid or there exist a fish variable for it?

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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:** [June 24, 2022, 2:29pm UTC](https://forum.itascainternational.com/t/undrained-strength-ratio-with-strain-softening/624/4 "2022-06-24T14:29:08Z")

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Or you can create different groups and each group use the same table, this will greatly reduce the number of tables.