Tim, You hint here the contractor Gulermak did not read the book. What is wrong with your assertion is that probably Gulermak has more know how to write better books than these. They are a high standard engineering company.

It is suggested that Gulermak is probably the first in the whole world to produce such segments. Sure something did wrong but they should be congratulated and admired for pushing the envelope and trying new techniques and not be made childish fun.

https://tunnelcontact.com/discussion/view/5826/most-likely-cause-of-segment-crack-established-turkiye-metro-tunnel-segments-crack-segments-use-fiber-reinforced-polymer-and-macro-synthetic-fiber

I see that you are an engineering student. You have a lot to learn, It is so difficult to put theories in practice and it requires witful engineers like at Gulermak.

after reading this and looking back, I now see that my comment above was not fair. My unreserved apologies to gulermak engineers and everybody else who had read my comment.