Function and Application of Geogrid in Flexible Pavement under Dynamic Load
Engineering and Technology Journal,
2021, Volume 39, Issue 8, Pages 1231-1241
AbstractNowadays, the increasing demand for road transport makes maintenance and repair of road infrastructures key tasks of road engineering. The current experimental work consists of laboratory model experiments to understand the conduct of sand as a subgrade under dynamic load and its effect on the flexible pavement and base layer. The reinforcement is applied at the interface between the base and subgrade using SS2 type of geogrid. The road layers are exposed to harmonic dynamic load with two load amplitudes of 10 and 15 kN and two frequencies of 0.5 and 1 Hz. The vertical stresses in the road layers are measured using stress a gauge sensor. In the case of a reinforcing geogrid in the middle of the base course, the stress decreases by increasing the frequency and load amplitudes by about (23-42(. The best position for geogrid is in the middle of the crushed stone layer because it gives the lower displacement. In the case of a reinforcing layer at the middle of the base course layer, the stress and vertical displacement decrease with increasing in frequency and load amplitudes. When laying the geogrid between the base course and subgrade, a lower decrease in the stress and vertical displacement could be obtained with the increase in frequency and loads.
- A laboratory model experiments to understand the behavior of subgrade under dynamic load.
- Reinforcement is applied at the interface between the base and subgrade layers.
- Layers are exposed to harmonic dynamic load with two amplitudes and two frequencies.
- The vertical stresses in the road layers are measured using stress gauge sensor.
- Stress decreases by increasing frequency and load amplitudes by about (23-42(%.
 B.M. Das, and E.C. Shin, “Strip foundation on geogrid-reinforced clay: behavior under cyclic loading.” Geotextiles and Geomembranes, 13(10), pp. 657-666, 1998.
 Q. Chen, M. Abu-Farsakh, R, Sharma, X. Zhang, “Laboratory investigation of behavior of foundations on geosynthetic-reinforced clayey soil”. Transportation Research Record: Journal of the Transportation Research Board, pp. 28–38, 2007.
 H. Siriwardane, R. Gondle, &K. Bora,“Analysis of flexible pavements reinforced with geogrids”, Geotechnical and Geological Engineering, vol. 28, No. 3, pp. 287–297, 2010.
 E.R.Sujatha, B. J. Vignesh, R. Vijay, “Improving the strength of sub grade using geo-grids”, International Journal of Emerging Trends in Engineering and Development, vol. 2, Issue 2, 2012.
 P. S. Kumar, and R. Rajkumar, “Effect of geotextile on CBR strength of unpaved road with soft subgrade” Electronic Journal of Geotechnical Engineering (EJGE), 17, pp. 1355 – 1363, 2012.
 L. Zheng, Y. H. Lin, W. Wan-peng, and C. Ping, “Dynamic stress and deformation of a layered road structure under vehicle traffic loads: Experimental measurements and numerical calculations”, Soil Dynamics and Earthquake Engineering, vol. 39, pp. 100-112, 2012.
 A. Graziani, E. Pasquini, G. Ferrotti, A. Virgili,and F. Canestrari, “Structural response of grid-reinforced bituminous pavements “Materials and Structures, 47(8): pp. 1391-1408, 2014.
 A. N. Najim, M.Y. Fattah, M. K. M. Al-Recaby, “Cyclic settlement of footings of different shapes resting on clayey soil”, Eng. and Tech. Journal, 38(3A), pp. 465-477,2020.
 Asphalt Institute, “Superpave Mix Design SP-2”, Third Edition, Lexington, KY, USA, 2003.
 A. I. K.Al-Utabi, "An approach in improving unpaved roads overlying soft clay soils using geogrid", M.Sc. thesis, College of Engineering, Al-Mustansiriyah University, Iraq, 2011.
 Z. T. Teama, "Suitability of dune sands subgrade beneath flexible pavement structure under repeated loads", M.Sc., thesis, College of Engineering, Al-Mustansiriyah University, Iraq, 2014.
 K. Reddy, ''Influence of subgrade condition on rutting in flexible pavements- an experimental investigation'', International Journal of Civil Engineering and Technology, vol. 4, Issue 3, pp. 30-37, 2013.
 M. F. Aswad, “Behavior of improved railway ballast overlying clay using geogrid”, Ph.D. thesis, Building and Construction Engineering Department, University of Technology, Baghdad, Iraq, 2016.
 B.Leshchinsky, and H. I. Ling “Numerical modeling of behavior of railway ballasted structure with geocell confinement,” Geotextiles and Geomembranes Journal, 36, pp. 33‒43, 2013.
 M. Y. Fattah, M. R. Mahmood, M. F. Aswad, "Stress distribution from railway track over geogrid reinforced ballast underlain by Clay", Earthquake Engineering and Engineering Vibration, vol. 18, no. 1, pp. 77-93, Springer, 2019.
 M. Y. Fattah, M. J. Al-Mosawi, A. F. I Al-Ameri, "Stresses and pore water pressure induced by machine foundation on saturated sand", Ocean Engineering, vol. 146, pp. 268–281, Elsevier, 2017.
 R. E. Hamdi, M. Y. Fattah, M. F. Aswad, “Studying the settlement of backfill sandy soil behind retaining wall under dynamic loads”, Eng. and Tech. Journal, vol. 38, part A (2020), no. 07, pp. 992-1000, 2020.
 M. Y. Fattah, N. M. Salim, M. S. Ismaiel, "Influence of geogrid reinforced loose sand in transfer of dynamic loading to underground structure", Eng. and Tech. Journal, vol. 34, part (A), no. 11, pp. 1915-1927, 2016
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