Which structural mechanism allowed Roman fortifications like Hadrian's Wall to withstand significant ground subsidence over centuries?

💡 Explanation

When ground subsidence occurs, segmented construction (opus caementicium) introduces numerous joints allowing the wall to shift and deform without collapsing, minimizing stress concentration. Therefore segment construction withstands movement, rather than deep foundations, internal buttresses, or reinforced concrete, which were either impractical or unavailable at the time.

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