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Experimental Studies on Behaviour of Stone Columns in Layered Soils

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Abstract

Stone columns are found to be effective and economical ground improvement technique in soft grounds. Understanding its behaviour when they are installed in stratified soils, in particular when the upper layer consists of weak soil, will be of great practical significance. This paper presents results from a series of laboratory plate load tests carried out in unit cell tanks to investigate the behaviour of stone columns in layered soils, consisting of weak soft clay overlying a relatively stronger silty soil, for various thicknesses of the top layer. Tests were carried out with two types of loading (1) the entire area in the unit cell tank loaded, to estimate the stiffness of improved ground and (2) only the stone column loaded, to estimate the limiting axial capacity. Laboratory tests were carried out on a column of 90 mm diameter surrounded by layered soil, for an area ratio of 15%. It is found that the depth of top weak layer thickness has a significant influence on the stiffness, load bearing capacity and bulging behavior of stone columns.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, India

    R. Shivashankar, M. R. Dheerendra Babu, Sitaram Nayak & V. Rajathkumar

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  1. R. Shivashankar
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  2. M. R. Dheerendra Babu
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  3. Sitaram Nayak
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  4. V. Rajathkumar
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Correspondence to M. R. Dheerendra Babu.

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Shivashankar, R., Dheerendra Babu, M.R., Nayak, S. et al. Experimental Studies on Behaviour of Stone Columns in Layered Soils. Geotech Geol Eng 29, 749–757 (2011). https://doi.org/10.1007/s10706-011-9414-0

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  • DOI: https://doi.org/10.1007/s10706-011-9414-0

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