Effect of Smear on Load Capacity of Sand Compaction Piles

A. Junejaa and B. A. Mirb

Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400 076, India.


Shear strength of model SCP installed in 100mm diameter and 200mm long clay specimens is investigated using conventional triaxial compression tests. The composite specimen were prepared by driving a small diameter PVC casing into the sample and then backfilling the cavity with sand column after removing the casing. The results seem to suggest that the smear zone does not have any significant effect on the shear strength of the composite specimen if sufficient time is allowed for excess pore pressures to dissipate during consolidation. Difference in the measured strength of specimens prepared with and without smear was also small when the specimens with smear were not permitted to completely consolidate prior to undrained shear.

Keywords: Sand compaction piles; installation effects; smear.

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