Improved performance of soft clay foundations using stone columns and geocell-sand mattress

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Improved performance of soft clay foundations using stone columns and geocell-sand mattress

Sujit Kumar Dash a, *, Mukul Chandra Bora b
a Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India
b Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India

 

a r t i c l e i n f o
Article history:
Received 23 November 2012
Received in revised form
23 August 2013
Accepted 31 August 2013
Available online 21 September 2013
Keywords:
Foundation
Geosynthetics
Stone columns
Ground improvement

 

a b s t r a c t
A series of experiments have been carried out to develop an understanding of the performance
improvement of soft clay foundation beds using stone column-geocell sand mattress as reinforcement. It
is found that with the provision of stone columns, of adequate length and spacing, about three fold
increases in bearing capacity can be achieved. While with geocell-sand mattress it is about seven times
that of the unreinforced clay. But if combined together, the stone column-geocell mattress composite
reinforcement, can improve the bearing capacity of soft clay bed as high as by ten fold. The optimum
length and spacing of stone columns giving maximum performance improvement are, respectively, 5
times and 2.5 times of their diameter. The critical height of geocell mattress can be taken equal to the
diameter of the footing, beyond which, further increase in bearing capacity of the composite foundation
bed is marginal.

 

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