Which outcome results when stone foundations experience differential settling?

💡 Explanation

Arch keystone instability occurs because outward thrust increases due to shifts from differential settling, stressing the joints beyond their capacity by exceeding static friction. This causes the joints to begin separating and the arch subsequently falls, rather than remaining static since the components lose their individual compression support.

• Which structural issue was mitigated by Brunel's use of wrought iron chains in the Clifton Suspension Bridge construction?
• Which consequence occurred when longship planks experienced over-tensioned lashing?
• Which inherent risk increased during 18th-century wooden ship construction due to rapid deforestation supplying shipyards?
• Which operational risk increased during longship voyages when repeated water saturation weakened hemp rope?
• Which mechanism allowed medieval Islamic astronomers to improve astronomical measurements using astrolabes?
• Which outcome risks undermining Ziggurat structural integrity when there is prolonged seasonal rainwater?