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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4694
Title: Laboratory model studies on unreinforced and geogrid-reinforced sand bed over stone column-improved soft clay
Authors: Deb K.
Samadhiya N.K.
Namdeo J.B.
Published in: Geotextiles and Geomembranes
Abstract: Results from a series of laboratory model tests on unreinforced and geogrid-reinforced sand bed resting on stone column-improved soft clay have been presented. The diameter of stone column and footing has been taken as 50 mm and 100 mm, respectively for all the model tests carried out. Load was applied to the soil bed through the footing until the total settlement reached at least 20% of footing diameter. As compared to unimproved soft clay, the increase in load-carrying capacity under different improved ground conditions has been observed. Influences of the thickness of unreinforced as well as geogrid-reinforced sand bed and the size of geogrid reinforcement on the performance of stone column-improved soft clay bed have also been investigated. Significant improvement in load-carrying capacity of soft soil is observed due to the placement of sand bed over stone column-improved soft clay. The inclusion of geogrid layer within sand bed further increases the load-carrying capacity and decreases the settlement of the soil. Due to the placement of sand bed, the bulge diameter of stone column reduces while the depth of bulge increases. Further reduction in the bulge diameter and increase in bulge depth are observed due to application of geogrid layer. The optimum thickness of unreinforced sand bed is twice the optimum thickness of geogrid-reinforced sand bed. Under specific material properties and test conditions, it is further observed that the optimum diameter of geogrid layer is thrice the diameter of footing. ¬© 2010 Elsevier Ltd.
Citation: Geotextiles and Geomembranes(2011), 29(2): 190-196
URI: https://doi.org/10.1016/j.geotexmem.2010.06.004
http://repository.iitr.ac.in/handle/123456789/4694
Issue Date: 2011
Keywords: Bulging
Geogrid reinforcement
Laboratory model tests
Sand bed
Soft clay
Stone column
ISSN: 2661144
Author Scopus IDs: 57202895862
6506534111
36158632100
Author Affiliations: Deb, K., Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur - 721302, India
Samadhiya, N.K., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee - 247667, India
Namdeo, J.B., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee - 247667, India
Corresponding Author: Deb, K.; Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur - 721302, India; email: kousik_deb@rediffmail.com
Appears in Collections:Journal Publications [CE]

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