Which mechanical outcome limited the height of stacked stone curtain walls in medieval fortifications lacking mortar?

💡 Explanation

When the height of a dry-stacked stone wall increases, lateral pressure from the weight of the stones rises. Since shear strength between stones is limited without mortar, at a certain height, lateral pressure overcomes shear strength leading to wall failure. Therefore lateral pressure exceeding shear strength, rather than resonance, buckling, or tensile failure becomes the primary limitation.

• Which functional advantage did Islamic scholars derive by applying geometric algebra for land surveying during the Abbasid Caliphate?
• Which challenge did Mesopotamian engineers face creating long irrigation canals near settlements?
• Which mechanism caused timber-framed fortifications like motte-and-baileys to degrade relatively quickly?
• Which water management outcome occurs during high rainfall on terraced hillsides employing Inca agricultural systems?
• Which inaccuracy arises due to refraction when measuring celestial body altitude near the horizon using an 18th-century sextant?
• Which agricultural outcome improved maize yield in pre-Columbian chinampa systems when farmers introduced 'waffle' beds with raised platforms?