hi, i need help on this problem for foundation engineering class , ASAP Thanks W

Question

hi, i need help on this problem for foundation engineering class , ASAP

Thanks

Which of the following situations is NOT likely to cause negative skin friction (or downdrag) on a deep foundation? Installation of a pile through an engineered fill that was place many years prior. Lowering of the groundwater table by 30 ft around a pile group Installation of drilled piers for a bridge abutment immediately after the construction of a 40 ft high embankment over compressible soil. Densification of sand around piles from earthquake vibrations

Explanation / Answer

Installation of pile through a fill placed many years ago is not likely to cause negative skin friction as the time estimated For skin friction to end is 2 years.

Lowering of water table will not help as it is deep foundation and installing piers immediately after construction of embankment over compressible soil will also cause negative skin friction. Densification of soil around piles by earthquake force will also cause negative skin friction.

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