# Factor of safety in tunnels

**URL:** <https://forum.itascainternational.com/t/factor-of-safety-in-tunnels/785>\
**Category:** ARMA 2022\
**Tags:** tips, suggestions\
**Created:** [October 19, 2022, 4:10am UTC](https://forum.itascainternational.com/t/factor-of-safety-in-tunnels/785 "2022-10-19T04:10:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Marcelo](https://avatars.discourse-cdn.com/v4/letter/m/f17d59/32.png) [@Marcelo](https://forum.itascainternational.com/u/Marcelo)\
**Post date:** [October 19, 2022, 4:10am UTC](https://forum.itascainternational.com/t/factor-of-safety-in-tunnels/785/1 "2022-10-19T04:10:03Z")

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To find the factor of safety in the tunnel with Flac 2D, would it be similar to the example that the program has for a slope with the command:  
model factor-of-safety convergence 10…  
or do other aspects have to be taken into account? because I get a very high factor

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**Author:** ![jhazzard](https://avatars.discourse-cdn.com/v4/letter/j/4af34b/32.png) [@jhazzard](https://forum.itascainternational.com/u/jhazzard)\
**Post date:** [October 19, 2022, 10:57pm UTC](https://forum.itascainternational.com/t/factor-of-safety-in-tunnels/785/2 "2022-10-19T22:57:11Z")

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In theory that should work. Although I’m not sure why you would specify CONVERGENCE 10. I would just say MODEL FACTOR-OF-SAFETY and see what happens.