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← TechnologyWhich risk increases when lateral soil pressure exceeds the design tolerance of underground concrete columns in a braced excavation?
A)Excessive column axial compression
B)Shear failure at column base
C)Buckling-induced column collapse✓
D)Increased rebar tensile strength
💡 Explanation
Buckling-induced column collapse becomes more probable because increased lateral pressure leads to bending moments exceeding slenderness ratio limits; therefore, the column buckles rather than experiencing pure compression because lateral deflection initiates instability, which rapidly degrades structural integrity.
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