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Which mechanism causes liquefaction of soil during an earthquake in a saturated sandy deposit?

A)Increased pore water pressure reduces effective stress
B)Shear wave reflection increases grain friction
C)Consolidation reduces void ratio immediately
D)Surface wave resonance amplifies particle interlock

💡 Explanation

When seismic waves pass through saturated soil, the cyclic loading increases pore water pressure because the water cannot escape quickly, significantly reducing the effective stress between soil particles. Therefore liquefaction occurs results, rather than increased friction, consolidation, or resonance which involve different soil conditions and mechanisms.

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