Performance of surface footing on geocell-reinforced soft clay beds |
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| Authors: | Sitharam G Thallak Sireesh Saride Sujit Kumar Dash |
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| Institution: | (1) Department of Civil Engineering, Indian Institute of Science, Bangalore, 560 012, India;(2) Department of Civil and Environmental Engineering, The University of Texas at Arlington, Arlington, TX 76019, USA;(3) Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, 781 039, India |
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| Abstract: | This paper presents the results of laboratory model tests carried out to develop an understanding of the behaviour of geocell-reinforced
soft clay foundations under circular loading. Natural silty clay was used in this study. The geocells were prepared using
biaxial polymer grid. The performance of the reinforced bed is quantified using non-dimensional factors i.e., Bearing capacity
improvement factor (If) and Percentage reduction in footing settlement (PRS). The test results demonstrate that the geocell mattress redistributes
the footing load over a wider area thereby improving the performance of the footing. The load carrying capacity of the clay
bed is increased by a factor of up to about 4.5 times that of unreinforced bed. From the pressure-settlement responses, it
is observed that the geocell-reinforced foundation bed behaves as a much stiffer system compared to the unreinforced case
indicating that a substantial reduction in footing settlement can be achieved by providing geocell reinforcement in the soft
clay bed. The maximum reduction in footing settlement obtained with the provision of geocell mattress of optimum size placed
close to the footing is around 90%. Further improvement in performance is obtained with provision of an additional planar
geogrid layer at the base of the geocell mattress. |
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| Keywords: | Circular footing Geocell reinforcement Model tests Reduction in footing settlement Soft clay |
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