Sure there are anchors that have the tensile strength on the anchor and on its embedment, but why not have a lipped channel, a "J" bolt embedded, or another item as I understood from an earlier thread that this was not embedded into rock, but instead anchored to sub-structure above.
Don’t disagree. This issue is largely due to politics, really. The put in the tunnel to meet the 1995 opening date, a political milestone. There was no forethough in the design for installation of the panels. Had they done so, a couple hundred $7 richmond anchors would have simply and efectively solved the design problem.
The magnitude of this project made everything dificult. There are hardly enough design engineers with the required competence to do everyday stuff, but when you are doing about the same amont of tunnel construction in a 10 mile area that is normally done across the country, the required manpower runs short, and stuff gets overlooked. Yeah, it’s a really bad oversight, but the initial designers did what was required, politically, to get the tunnel built and opened on schedule.
It may not have been rock, but roof slabs on these tunnels were 8' thick concrete, designed to survive a direct 747 crash, it's probably more competent than rock.