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← HistoryWhich mechanical risk dramatically increased with Inca terraced masonry retaining walls as heights exceeded 10 meters?
A)Foundation shear stress accumulation✓
B)Vegetation root cryogenic cracking
C)Differential soil settlement dilation
D)Increased thermal expansion spalling
💡 Explanation
Excessive height increases shear stress at the base because weight accumulates; thus the retaining walls become unstable because this exceeds the rock’s shear strength, therefore foundation shear stress accumulation occurs rather than challenges of freeze-thaw cycles or thermal material properties.
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