Numerical Analysis of Geogrid Reinforcement on the Ultimate Bearing Capacity of Strip Footing Under Eccentric Loads and Determination of Optimum Layout

Document Type : Research Article

Authors

1 Engineering Faculty, Yasouj University, Yasuj, Iran

2 Faculty of Engineering, Yasouj University, Yasouj, Iran

Abstract

In this study, the effect of geogrid on the ultimate bearing capacity of strip footing, which was imbedded on sandy soil and under eccentric loads (VM) was investigated by using PLAXIS 2D finite element software. After numerical verification, the effect of parameters, such as the amount of eccentricity, applied vertical load, the number of reinforced layers and layout of the geogrid layers on the ultimate bearing capacity of strip footing was studied. The results of analyzes were presented in the form of dimensionless graphs. Based on the analyses result, the optimum depth of first geogrid layer from foundation (u), the vertical intervals of the layers (h), the number (N) and layout of the geogrid layers have been determined. The results of the analysis show that by adding the geogrid layers, the bearing capacity of footing under the eccentric load increases significantly. The amount of the effectivity is related to the layout of layers and the amount of the eccentricity. In the optimum layout of the layers, the position of geogrid layers depends on the number of layers. Also, the optimum number of layers for obtaining the maximum bearing capacity at eccentric load condition was obtained to be four layers in the present study. The optimum depth for the first, second, third and fourth layers, at the optimal layout, was 0.5, 0.7, 0.3 and 0.9 meters from the base of the footing, respectively.

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References

[1] Saran, S., Kumar, S., Garg, K., and Kumar, A. Model tests on eccentrically and obliquely loaded footing resting on reinforced sand. International Journal of Geotechnical Engineering, 2(3), 2008, 179-197.
[2] Sadoglu, E., Cure, E., Moroglu, B., and Uzuner, B. A. Ultimate loads for eccentrically loaded model shallow strip footing on geotextile-reinforced sand. Geotextiles and Geomembrances, 27(3), 2009, 176-182.
[3] El Sawwaf, M. Experimental and numerical study of eccentrically loaded strip footing resting on reinforced sand. Journal of Geotechnical and Geoenvironmental Engineering, 135(10), 2009, 1509-1518.
[4] Ornek, M. Estimation of ultimate loads of eccentricinclined loaded strip footing rested on sandy soils. Neural Comput and Applic, 25(1), 2013, 39-54.
[5] Badakhshan, E., and Noorzad, A. Load eccentricity effects on behavior of circular footing reinforced with geogrid sheets. Journal of Rock Mechanics and Geotechnical Engineering, 7(6), 2015, 691-699.
[6] Sahu, R., Patra, C. R., and Sethy, B. P. Experimental and Numerical studies of eccentrically loaded strip footing by using plaxis. Indian Geotechnical Conference, 2017, 1416.
[7] Badakhshan, E., and Noorzad, A. A simplified method for prediction of ultimate bearing capacity of eccentric loaded foundation on geogrid reinforced sand. Int. J. of Geosynth. And ground Eng., 3(14), 2017.
[8] Loukidis, D., Chakraborty, T., and Salgado, R. Bearing capacity of strip footing on purely frictional soil under eccentric and inclined loads. Can. Geotech. J., 45(6), 2008, 768-787.
[9] Khing, K. H., Das, B. M., Puria, V. K., Cooka, E. E., and Yena, S. C. The bearing capacity of strip foundation on geogrid reinforced sand. Geotextiles and Geomembrances, 12(4), .163-153 ,3991
[10] Gottardi, G., and Butterfield, R. On the bearing capacity of surface footing on sand under general planar loads. Soils and Foundations, 33(3), 1993, 68-79.
 
Amirkabir Journal of Civil Engineering
Volume 52, Issue 12
March 2021
Pages 3109-3124

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