Which structural failure mode limited the height of Roman defensive walls constructed with opus caementicium?

💡 Explanation

Shear failure occurred because the lateral earth pressure from backfilled earthen ramps exerted significant horizontal forces on high opus caementicium walls exceeding the tensile strength of the mortar, leading to sliding or cracking. Therefore, shear was the height limiting factor, rather than tensile cracking, buckling or corrosion all of which result from different stress regimes.

• Which risk increases when stacked defensive walls have excessive soil pore pressure following intense rain?
• Which navigational error increases most significantly due to fluctuations in 18th-century chronometer escapement?
• Which structural risk increases when timber pile foundations are exposed to fluctuating water levels in Venice, Italy?
• Which environmental consequence limits the long-term productivity of steeply terraced agricultural systems without proper drainage?
• Which mechanism limited the maximum height of the central nave in Romanesque churches prior to Gothic architecture?
• Which navigational error increases when a 18th-century sailing ship experiences significant compass deviation?