Discussion
Gravel deposits are generally less susceptible to liquefaction because they
Answer: C
Correct answer: drain quickly enough to dissipate the pore pressure
Liquefaction requires the pore pressure to build up faster than it can escape, which is why it is essentially an undrained phenomenon. Gravel is permeable enough that the pressure generated by each cycle drains away as it forms. The exception worth knowing is a gravel confined between impermeable layers, which cannot drain and can liquefy.
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