Static Analysis of Flexible Pavements over Expansive Soils
To study and predict the behavior of flexible pavement over expansive soils, a pavement structure was subjected to different laboratory and fieldwork experiments. The existing pavement was replaced and designed based on California Bearing Ratio (CBR) method, with a new one, and subjected to the traffic from various number of load cycles from 12.1 up to 155.52 kcycles of standard axle load (80 kN) through dual wheel assembly over a 6-month period. As the preliminary step, the deflection measurements were taken at the asphalt surface layer, using a Total station at different distances as function of truckload applications. The numerical analysis is carried out with the Finite Element software package PLAXIS version 2012. In the new model, the calculation of the transferred pressure to the pavement through contact area of tires is 3D it was turned into a 2D problem, and the pavement was subjected to a static loading using a ratio factor of dynamic additional charge. The materials’ behavior was simulated with nonlinear models: Mohr–Coulomb (MC) for pavement layers and soft-soil model (SSM) for the expansive subgrade, in saturated drained and undrained conditions. The results indicate that displacements under static loading in saturated drained conditions and when non-linear materials are present are the closest to field measured deflections.
KeywordsFlexible pavements Expansive subgrades Soil behavior Finite element method PLAXIS
The authors gratefully acknowledge the support given by the team of Civil Engineering and Mining Laboratories of Larbi Tebessi University for their support and help in completing this work.
- 2.Ayman A (2007) Numerical simulation of a trial wall on expansive soil in Sudan. Plaxis Bull 21:14–18Google Scholar
- 3.Snethen, Townsend FC, Johnson LD, Patrick DM, Vedros PJ (1975) Review of engineering experiences with expansive soils in highway subgrades. US Army Engineer Water Ways Experiment Station, FHWA, Washington, DCGoogle Scholar
- 6.Liu X, Sheng K, Hua J, Hong B, Zhu J (2015) Utilization of high liquid limit soil as subgrade materials with pack-and-cover method in road embankment construction. IJCE 13(3 and 4B):167–174Google Scholar
- 13.Felt J (1953) Influence of soil volume change and vegetation on highway engineering. In: Highway conference of the University of Colorado, pp 51–76Google Scholar
- 14.Chen FH (1988) Foundations on expansive soils. American Elsevier Sci. Pub. Com, New YorkGoogle Scholar
- 16.Duncan JM, Monismith CL, Wilson EL (1968) Finite element analyses of pavements. Highw Res Rec 228:18–33Google Scholar
- 17.Raad L, Figueroa JL (1980) Load response of transportation support systems. J Transp Eng 106(1):111–128Google Scholar
- 18.Barksdale RD, Brown SF, Chan F (1989) Potential benefits of geosynthetics in flexible pavement systems. Transportation Research Board, NCHRP Report No. 315, Washington, DCGoogle Scholar
- 19.Papadopoulos E, Santamarina JC (2015) Analysis of inverted base pavements with thin-asphalt layers. Int J Pavement Eng 17(7): 590–601. http://www.tandfonline.com/doi/full/10.1080/10298436.2015.1007232
- 25.Huang Y (2004) Pavement analysis and design, 2nd edn. Pearson Education, New JerseyGoogle Scholar
- 26.EN 1991-2 (2002) Actions on structures, Part 2: traffic loads on bridges. European Committee for StandardizationGoogle Scholar
- 29.Ti KS (2009) A review of basic soil constitutive models for geotechnical application. Electron J Geotech Eng, 14. http://ejge.com/2009/Ppr0985/Ppr0985ar.pdf