01024962

Component

https://doi.org/10.3141/1975-18

http://scholar.google.com...Gabr&publication_year=2006

Unpaved road sections experience degradation and accumulation of plastic deformation under repeated loading. Geogrid placed between subgrade and aggregate base course (ABC) can improve section performance through several mechanisms and lead to reduction in stresses and plastic deformation. An unpaved road design model that includes provisions for mobilization of subgrade bearing capacity under axisymmetric condition is proposed. The model incorporates base course property, mobilization of subgrade bearing capacity with rutting, degradation of base course stress attenuation with cyclic load, and the effect of reinforcement inclusion. An elastic layer method has been used to backanalyze the vertical stresses on subgrade with data from previous cyclic plate load tests performed in the laboratory. The degradation of unpaved sections was expressed as a reduction in base course–subgrade elastic modulus ratio (E1/E2) with an increasing number of cycles or a decrease in stress distribution angle of base course. The proposed model has been validated by data from a field study. Computed base course thickness matched well with the test results, but further verification of the method based on field testing is needed before it is accepted as a viable design tool.

01039137

English

pp 146-154

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099846

Print

Figures (9) ; References (22)

Backcalculation; Base course (Pavements); Bearing capacity; Geogrids; Material reinforcement; Mathematical models; Modulus of elasticity; Plastic deformation; Repeated loads; Rutting; Subgrade (Pavements); Unpaved roads

Data and Information Technology; Geotechnology; Highways; Materials; I33: Other Materials used in Pavement Layers; I42: Soil Mechanics

TRIS, TRB, ATRI

Mar 3 2006 10:52AM

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• Base Reinforcement with Biaxial Geogrid: Long-Term Performance
• COM624P-Based Drilled Shaft Torque and Lateral Load Analysis Method
• Comparison of Field and Laboratory Pullout Tests on Geosynthetics in Marginal Soils
• Construction-Induced Stresses in H-Piles Supporting an Integral Abutment Bridge
• Deflection of Prototype Geosynthetic-Reinforced Working Platforms over Soft Subgrade
• Design and Monitoring of an Embankment on Controlled Modulus Columns
• Durability of Galvanized Soil Reinforcement: More Than 30 Years of Experience with Mechanically Stabilized Earth
• Evaluation of Full-Sized Cast-in-Place Pile Capacity with Artificial Defects
• Horizontal Bearing Capacity of Suction Piles in Sand
• Influence of Soil Strength on Optimal Embedment Depth of Geosynthetic Reinforcement Layer in Granular-Reinforced Foundations
• Intelligent Soil Compaction Technology: Results and a Roadmap Toward Widespread Use
• Numerical Simulation of Dynamic Behavior of Geofoam Embankment
• Reuse of Fly-Ash Amended Petroleum-Contaminated Soils in Highway Embankments
• Sustainable Earthworks Specifications for Transport Infrastructure
• Visual Rating and Strength Testing of 40-Year-Old Precast Prestressed Concrete Bridge Piling