saw this thread and fascinated by the techy talk
But am I missing something obvious or am I just being an ex-surveyor who teaches dancing, This is not a classic arch fro two reasons, 1) it is squashed so there is a much higher loading going through the centre and not diverted down the sides and 2) I have never seen an arch that is not either a) a continuous fabrication or b) built symetrically with the loading through a centre stone.
In this case the centre and the main focal point of the load is a join
I am not convinced the side filling had much to do with it, but I am waiting for them to find the black box. As they say and particularly on this occasion "keep watching this space"
Adam
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