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Effect of the Smear Zone around SCP Improved Composite Samples Tested in the Laboratory

DSpace at IIT Bombay

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Title Effect of the Smear Zone around SCP Improved Composite Samples Tested in the Laboratory
 
Creator JUNEJA, A
MIR, BA
ROSHAN, NS
 
Subject Consolidation
Sand compaction piles
Smear zone
Triaxial
Undrained shear strength
INSTALLATION
CLAY
SOIL
DRAINS
PILES
 
Description In the design practice for sand compaction piles (SCPs), it is usually assumed that the state of in situ soil does not change during installation. In fact, there is evidence to suggest that extensive remolding of the preferred soil fabric can occur within the zone immediately surrounding the SCP during its installation. Properties of the soil within this heavily disturbed zone can effect pore pressure dissipation and hence the time after which the ultimate strength of the composite ground is available. In this study, the effect of the smear zone around SCPs is modeled using triaxial tests. SCPs of 25-80 mm diameter were installed in 100-mm-diameter cylindrical samples. The sand columns were installed by predrilling a hole and then backfilling it with well-compacted sand. The smear zone was created by using a rough casing to drill the hole. The effect of the smear zone on SCP was investigated by observing the change in pore pressure during consolidation and undrained shear strength of the composite ground. Although both the shear-induced pore pressures and the undrained shear strength of the composite samples could reasonable be predicted, wide scatter still existed in the relationship between the stress concentration factor and the area replacement ratio. (C) 2013 American Society of Civil Engineers.
 
Publisher ASCE-AMER SOC CIVIL ENGINEERS
 
Date 2014-10-16T12:18:34Z
2014-10-16T12:18:34Z
2013
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF GEOMECHANICS, 13(1)16-25
http://dx.doi.org/10.1061/(ASCE)GM.1943-5622.0000169
http://dspace.library.iitb.ac.in/jspui/handle/100/15527
 
Language en