Improving the Bearing Capacity of Footing on Soft Clay with Sand Pile with/without Skirts

Ashraf K. Nazir(1*), Waseim R. Azzam(2)

(1) Structural Engineering Dept., Faculty of Engineering, Tanta University, Egypt
(2) Structural Engineering Dept., Faculty of Engineering, Tanta University, Egypt
(*) Corresponding author

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This paper presents the results of laboratory model tests for studying the improvement of soft clay layer by using both partial replaced sand columns with/without confinement. This research is performed to study the effect of sand column to improve the bearing capacity, control the settlement, the variation of sub grade modulus, and investigate the induced failure mechanism of shallow circular footing on replaced soil with/without skirts. The results show that the improvement of load bearing capacity could be remarkably induced, using both partial replaced sand column with and without confinement by skirts. The adopted technique can substantially modify the stress displacement curve and significantly decreases the settlement. In addition, it makes the replaced soil block inside the skirts behaves as deep foundation. Therefore, the mechanism of the bearing capacity failure of a footing rested on soft clay can be modified from punching to general bearing capacity failure at the tip of confined replaced sand column.
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Soil Improvement; Bearing Capacity; Circular Footing; Soft Clay; Confinement; Skirts

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Ali, F.H., Adnan, A., & Choy, C.K., (1992). Geotechnical properties of a chemically stabilized soil from Malaysia with rice husk ash as an additive. Geotechnical and Geological Engineering, 10, 117 – 134.

Balasubramaniam A.S., Lin D.G., Acharya S.S.S., & Kamruzzaman, A.H.M. (1999). Behaviour of soft Bangkok Clay Treated with Additives. The 11th Asian Regional Conference on Soil Mechanic and Geotechnical Engineering, Seoul. 1, 11 – 14.

Muntohar A.S., & Hantoro, G. (2000). Influence of the Rice Husk Ash and Lime on Engineering Properties of Clayey Sub grade. Electronic Journal of Geotechnical Engineering, Vol. 5 2000, Paper#019.

Muntohar, A.S., & Hashim, R. (2002). Silica waste utilisation in ground improvement: A study of expansive clay treated with LRHA. The 4th International Conference on Environmental Geotechnics, Rio de Janeiro, 1, 515 – 519.

Muntohar, A.S. (2004). Uses of RHA to Enhanced Lime -Stabilized Clay Soil. International Conference on Geotechnical Engineering, Sharjah, UAE, 356 – 357.

Hebib, S. and E. R. Farrell (2003) Some experiences on the stabilization of Irish peats, Can. Geotech. J., 40: 107-102.

Porbaha, A. and Bouassida, M. (2004). Bearing Capacity of Foundations Resting on Soft Ground Improved by Soil Cement Columns. International Conference on Geotechnical Engineering, Sharjah, UAE, 172 – 180.

Hirao, K. Yashara, K. Takaoka, K., Nishimura, J., and Tanabashi, Y., 1992. Laboratory Model Tests on the Application of Composite Fabrics to Soft Clay. Proceedings of the International Symposium on Earth Reinforcement Practice, Vol. 1, pp. 601-606.

El Sawwaf, M.E. (2008). Behavior of Strip Footing on Geogrid-reinforced Sand over Soft Clay slope. Getextile and Geomembrane 25, pp. 50-60.

Love, J.P, H.J., Milligan, G.W.E., Houlsby, G.T., (1987). Analytical and model studies of reinforcement of layer of granular fill on a soft clay sub grade. Canadian Geotechnical Journal 24, 611-622.

Al-Aghbari, M. Y and Khan, A. K (2002a) “Behavior of shallow strip foundation with structural skirts resting on dense sand” Concrete for Extreme Condition, Proceeding of the International Conference held at the University of Dundee, Scotland, U.K, pp. 737 – 746.

Al-Aghbari, M. (2002b) “Settlement of shallow square foundation with structural skirts resting on sand” Proceeding of the 2nd International Conference on Geotechnical and Geoenvironmental Engineering in Arid Land , Riyadh, Saudi Arabia, pp. 189– 193.

Gourvenec, S. Alternative design approach for skirted footings under general combined loading. Proc. ICOF Dundee, 2-5 Sept. 2003, pp. 341-349.

Al-Aghbari, M. (2004) “Bearing Capacity of Shallow Circular Foundations with Structural Skirts Resting on Sand” International Conference on Geotechnical Engineering, Sharja, UAE, pp. 34– 39.

El Sawwaf, M.E. and A. Nazer (2005) Behavior of circular footing resting on confined granular soil. Journal of Geotechnical and Geoenvironmental Engineering, 131(3), 359- 366.

Singh, V. and Prasad, A. (2007). Effect of Soil Confinement on Ultimate bearing Capacity of Square Footing under Eccentric–Inclined Load. Electronic Journal of Geotechnical Engineering, Vol. 12, 14 p

Etezad, M., Hanna, A.M. and Ayadat. T. (2006) Bearing capacity of groups of stone columns, Proceedings of the 6th European Conference on Numerical Methods in Geotechnical Engineering, Graz, pp. 781-786.


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