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Geomechanics and Engineering Volume 32, Number 6, March25 2023 , pages 567-581 DOI: https://doi.org/10.12989/gae.2023.32.6.567 |
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Influence of dual layer confinement on lateral load capacity of stone columns: An experimental investigation |
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Akash Jaiswal and Rakesh Kumar
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| Abstract | ||
| Enhanced vertical load capacity of the ground reinforced with the stone columns drew great attention by the researchers as it deals with many of the geotechnical difficulties associated with the weak ground. Recently, it has been found that the stone columns are also prone to fail under the shear load when employed beneath the embankments or the foundations susceptible to lateral loads. In this study, the effect of various encasement conditions on the lateral deflection of stone columns is investigated. A method of dual layers of encasement has been introduced and its the effect on lateral load capacity of the stone columns has been compared with those of the single encased stone column and the un-encased stone columns. Large shear box tests were utilised to generate the shear deformation on the soil system under various normal pressure conditions. The stiffness of the soil-stone column combined system has been compared for various cases of encasement conditions with different diameters. When subjected to lateral deformation, the encased columns outperformed the un-encased stone columns installed in loose sand. Shear stress resistance is up to 1.7 times greater in dual-layered, encased columns than in unencased columns. Similarly, the secant modulus increases as the condition changes from an unencased stone column to single-layer encasement and then to dual-layer encasement, indicating an improvement in the overall soil-stone column system. | ||
| Key Words | ||
| dual layer; encasement; lateral load; shear modulus of elasticity; stone column | ||
| Address | ||
| Akash Jaiswal and Rakesh Kumar: Department of Civil Engineering MANIT, Bhopal,462003, India | ||