Our tunnel team is trying to do some seismic analysis on our FE design models

RE: Our tunnel team is trying to do some seismic analysis on our FE design models

Stefanos Papavasileiou — Thu, 03 Dec 2020 10:34:57 GMT

Dear Siamak and Neil,

I noticed that you have also submitted a Service Request regarding this topic and my colleague has already responded.

Please check with the service request and reply if something is unclear or needs further clarification.

RE: Our tunnel team is trying to do some seismic analysis on our FE design models

Siamak Aghili — Mon, 30 Nov 2020 17:15:38 GMT

Hi Berk,

As this is an accepted approach by authentic sources including FHWA and ITA, and also there are so many papers are referring to Plaxis results based on this approach.

It is brought in 13.5.1.1 Simplified Procedure for Ovaling Response of Circular Tunnels: https://www.fhwa.dot.gov/bridge/tunnel/pubs/nhi09010/tunnel_manual.pdf

Can you please provide us with your comments in more details?

Regards,

Siamak

RE: Our tunnel team is trying to do some seismic analysis on our FE design models

Berk Demir — Sat, 28 Nov 2020 05:51:13 GMT

As long as you reach the same deformation difference from top to bottom. However, it is not over with that. This is very tricky process and even after 100ths of analyses, I can still find some problems in a procedure that works for 100 others. So, you should understand the analytical method, the expected deformation profile (both free field and with tunnel) and check the Plaxis with that. Assuming Plaxis will work well for this method is not a good idea.