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Subgrade Improvement by Sand Compaction Pile

George M Varghese, Roshini Elsa Mathew, Smithamol Korah, Vishnupriya K, Sonia Maria Kuriakose

Abstract


Expansive soil becomes soft on wetting and losses its strength, resulting in differential settlement. Vast areas, particularly coastal regions, are covered with thick soft clay deposits having very low shear strength posing difficulty to use as subgrade. Such soils were avoided or proper soil improving techniques need to be adopted. Ground improvement techniques are normally preferred for economy and one of which is Sand Compaction Pile (SCP) method. SCP is widely adopted to improve weak/lose ground to achieve adequate bearing capacity and reduce the settlement. In this study the load carrying capacity of soft clay with and without compaction pile by M sand is tested using CBR test. Also, the effect of variation in the pattern of installation and spacing between the piles on the load-settlement behavior was examined. The test results indicate that compaction piles decreases the subgrade settlement and the triangular pattern with 2.5D spacing is most the effective technique. The permeability results reveal an added advantage of SCP, by draining the moisture that might have clogged between the subgrade and base course. 


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References


Youl Heo, Geun Chae Jeong, and Woo Seok Baez, Evalution of the effect of penetration by Sand Compaction Pile, Indian Geotechnical Conference, Vol.33, Issue 3, 2015.

Juneja A., B. Mir, and A. Parihar, Effect of sand compaction pile installation in model clay bed, International Journal of Geotechnical Engineering, Vol.5, Issue 2, 2011.

Ali K., Sharma K.G, and J.T Shahu, Behaviour of Reinforced Stone Columns in Soft Soils an Experimental Study, Indian Geotechnical Conference, pp:625 – 628, 2010.

Samanta, M. Sawant, and V.A. Ramasamy, Ground Improvement Using Displacement Type Sand Piles, Indian Geotechnical Conference, pp:630-632, 2011.

Ashraf Kamal Nazir and Wasim R Azzam, Improving the bearing capacity of footing on soft clay with sand pile, Alexandria Engineering Journal, pp:371–377, 2010.

Mir B.A. and A Juneja, Strength Behaviour of Composite Ground Reinforced with Sand Columns, Indian Geotechnical Conference, pp:645 – 648, 2010.

Juran I and Guermazi. A., Settlement Response of Soft Soils Reinforced by Compacted Sand Columns, International Journal of Geotechnical Engineering, Vol.114, Issue 8, 1988.

Okamura, M Ishihara, and K Tamura, Degree of Saturation and Liquefaction Resistances of Sand Improved with Sand Compaction Pile, Journal of Geotechnical and Geo-environmental Engineering, Vol.132, Issue 2, 2006.

Jong Bum Jung, Kang Lee and Jean Soo Lee, Consolidation Behaviour of Clay Ground Improved by Sand Compaction Piles, KSCE Journal of Civil Engineering, pp:205 – 212, Vol.3, Issue 2, 1999.

Gutub M.Z.A and A.M. Khan, Shear Strength Characteristics of Madinah Clay with Sand Compaction Piles, Geotechnical Testing Journal, Vol.21, Issue 4, 1998.


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