The Influence of the Geogrid Layers on the Bearing Capacity of Layered Soils
Many classical bearing capacity theories assume that the natural soil's layers are homogenous for determining the bearing capacity of the soil. But, in many practical projects, we encounter multi-layer soils. Geosynthetic as reinforcement materials have been extensively used in the construction of various structures. In this paper, numerical analysis of the Plate Load Test (PLT) using of ABAQUS software in double-layered soils with different thicknesses of sandy and gravelly layers reinforced with geogrid was considered. The PLT is one of the common filed methods to calculate parameters such as soil bearing capacity, the evaluation of the compressibility and the determination of the Subgrade Reaction module. In fact, the influence of the geogrid layers on the bearing capacity of the layered soils is investigated. Finally, the most appropriate mode for the distance and number of reinforcement layers is determined. Results show that using three layers of geogrid with a distance of 0.3 times the width of the loading plate has the highest efficiency in bearing capacity of double-layer (sand and gravel) soils. Also, the significant increase in bearing capacity between unreinforced and reinforced soil with three layers of geogrid is caused by the condition that the upper layer (gravel) thickness is equal to the loading plate width.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1340548Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 315
 Bowles, J. E., “Foundation Analysis and Design”, McGraw-Hill, New York, 1988.
 Meyerhof, G. G. and Hanna, A. M., “Ultimate bearing capacity of foundations on layered soils under inclined load”, Can. Geotech. J., Vol.15, pp. 565- 572, 1974.
 Button, S. J., “The bearing capacity of footings on a two-layer cohesive subsoil”, Proc., 3rd Int. Conf. on soil mechanics and foundation engineering, Zurich, Vol.1, pp.332- 335, 1998.
 Reddy, A. S., and Srinivasan, R. J. “Bearing capacity of footings on layered clays”, J. Soil Mech. Found. Div., ASCE, Vol. 93, No. 2, pp. 83- 99, 2001.
 Brown, J. D. and Meyerhof, G. G. “Experimental study of bearing capacity in layered clays”, Proc., 7th Int.Conf. on soil Mechanics and foundation engineering, Mexico, Vol. 2, pp.45- 51, 1988.
 Griffiths, D. V., “Computation of bearing capacity on layered soils”, Proc., 4th Int. Conf. on Num Meth. In Aeromechanics, Vol. 1, pp.163- 170, 2003.
 Chen, W. F., and Davidson, H. L. “Bearing capacity determination by limit analysis”, J. Soil Mech. Found. Div., Vol. 99, No. 6, PP.433- 449, 2003.
 Merifield, R. S., Sloan, S. W., and Yu, H. S., “Rigorous plasticity solutions for the bearing capacity of two layered clays”, Geotechnique, Vol. 49, No. 4, pp. 471- 490, 1999.
 Verma S. K, V. Jain P. K, J. Rakesh, K, “Prediction of bearing capacity of granular layered soils by plate load test”, International journal of advanced engineering research and studies, Vol. 2, No. 3, pp. 142- 149, 2013.
 Murad Y. Abu-Farsakh, Imran Akond, Qiming Chen, “Evaluating the performance of geosynthetic-reinforced unpaved roads using plate load tests”, International Journal of Pavement Engineering, Vol. 17, No. 10, pp. 901- 912, 2016.
 M. A. Gabr and John H. Hart, “Elastic Modulus of Geogrid-Reinforced Sand Using Plate Load Tests”, Geotechnical testing journal, Vol. 23, No. 2, pp. 215- 220, 2000.
 E. M. Ibrahim, S. M. El-Badawy, M. H. Ibrahim, A. Gabr, A. Azam, “Effect of geogrid reinforcement on flexible pavements”, Innovative Infrastructure Solutions, Vol. 2, No. 54, 2017.
 D. Kiptoo, J. Aschrafi, D. Kalumba, J. Lehn, C. Moormann, and E. Zannoni, “Laboratory Investigation of a Geosynthetic Reinforced Pavement Under Static and Dynamic Loading”, Journal of Testing and Evaluation, Vol. 45, No. 1, pp. 76- 84, 2017.
 Hufenus, R., Rueegger, R., Banjac, R., Mayor, O., Springman, S.M., and Bronnimann, R. “Full-scale field tests ongeosynthetic reinforced unpaved roads on soft subgrade”, Geotextiles and Geomembranes, Vol. 24, No. 1, pp. 21- 37, 2006.