Which mechanical vulnerability was strategically exploited when using sapping during a siege?

💡 Explanation

Sapping relied on undermining walls, inducing localized soil liquefaction. The water content increases the pore water pressure, because that pressure becomes significant relative normal stress, therefore reducing effective stress, rather than global structural shear.

• Which outcome resulted from early Chinese gunpowder exceeding the deflagration-to-detonation threshold?
• Which precision limit arises when calculating celestial altitude using a cast bronze medieval astrolabe?
• Which optical phenomenon, systematically studied by Ibn al-Haytham, explains the magnification limit in early Alhazen lenses?
• Which outcome during a siege resulted from Roman fortifications utilizing the testudo formation approach?
• Which risk increased for Viking longships attempting transoceanic voyages when sailcloth degraded?
• Increased erosion and undermining occurred during intense monsoon seasons because which pressurized water transport mechanism in ancient Mughal gardens failed?