In August at HS2's 2,5km long Chitern Tunnel, some quality problems had been discovered with the precast concrete supplied by Stanton Precast (Sateba). The MD of the company Ian Steel had got the job just 7 months ago on 8 February.
https://www.constructionnews.co.uk/contractors/hs2-tunnel-segment-supplier-replaces-md-12-09-2022/
Maybe they used "Fiber Reinforced Polymer and Macro Synthetic Fiber" ın segments instead of traditional steel?
There was such a case in İzmir Metro in Türkiye a few years ago:
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.constructionnews.co.uk/contractors/hs2-tunnel-segment-supplier-replaces-md-12-09-2022/
HS2 tunnel segment supplier replaces MD | Construction News
www.constructionnews.co.ukStanton Precast has announced the appointment of a new managing director. The company is producing precast concrete segments for a 2.5km “green tunnel”