Which structural failure risked undermining walls in Roman siege warfare utilizing mines?

💡 Explanation

When Roman engineers mined under enemy walls, foundation settling from soil liquefaction occurred because removing subsurface soil destabilized the above structure due to loss of support, potentially leading to collapse. Therefore foundation settling results, rather than arch, wall bulging, or ramp slippage which require different destabilization mechanisms such as direct keystone removal, hydrostatic pressure, or ramp construction limitations.

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