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← HistoryWhich outcome occurs when countermining reaches beneath stone defensive walls?
A)Overturning occurs with soil excavation✓
B)Settlement increases during soil consolidation
C)Sliding initiates due to liquefaction
D)Buckling leads to material cracking
💡 Explanation
Overturning occurs because soil excavation removes lateral support beneath the wall. The overhanging mass creates an increasing eccentric load following the Force Equilibrium principle; therefore undermining induces rotation, rather than settlement or liquefaction under normal conditions.
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