Which risk increased when Roman siege engineers undermined fortress walls with tunnels during the siege of Alesia?

💡 Explanation

When tunnels undermined walls, differential soil settlement occurs because load-bearing support is removed unevenly, compromising structural integrity leading to an abrupt collapse. Therefore, sudden collapse results, rather than decreased damping, rebar degradation, or seismic amplification, which are related to separate structural failure modes.

• Which constraint limited consistent maize yields in pre-Columbian chinampa agriculture despite nutrient-rich conditions?
• Which limitation constrained the accuracy of pre-telescopic astronomical observations using astrolabes?
• Which structural mechanism most likely led to the breaching of medieval castle curtain walls during sieges using trebuchets?
• Which environmental adaptation enables pre-Columbian Andean terraced fields to prevent widespread topsoil loss after heavy rainfall?
• Which mechanical consequence arises when an astrolabe's alidade is misaligned with the rete during celestial observation?
• During rainfall, which risk was reduced in Mesopotamian ziggurats via bitumen application above sun-dried bricks?