01147850

Component

https://doi.org/10.3141/2116-11

http://scholar.google.com...Edil&publication_year=2009

The longevity of a pavement system is closely related to the amount of deformation of both the asphalt surface and the underlying layers. Placing a geogrid in the granular base decreases the amount of rutting at the surface by providing some strength to the base and increasing stiffness and thus limiting elastic deformations and loads transmitted to the subgrade. However, the zone of influence of the geogrid layer on surrounding soil particles and the increase in modulus in this zone are not well known. A testing scheme aimed at quantifying both the zone of influence and the increase in the modulus caused by the presence of a geogrid in granular materials was developed. Both P-wave velocity and the shear strain induced by loading a 150-mm diameter plate were examined. P-wave velocity results indicated a change in modulus across the geogrid from a minimum of 1.35 (at 75-mm geogrid depth) to a maximum of 2.66 (at 100-mm geogrid depth) over modulus expected in unreinforced soils. Expected internal soil rotations were modeled with PLAXIS and compared with laboratory tests. These analyses showed that the shearing of soil was confined to a zone above the geogrid. Rotation tests showed a zone of influence of 30 to 40 mm on both sides of the geogrid reinforcement; however, the zone of influence depends on the position of the geogrid, with a geogrid 100 mm in depth seeming most able to constrain subsurface soils and distribute the shear stresses caused by the 150-mm-diameter loading plate.

01147419

09-2594

English

pp 76-84

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309126311

Print

Figures (7) ; References (19) ; Tables (1)

Asphalt pavements; Base course (Pavements); Geogrids; Granular materials; Laboratory tests; Material reinforcement; Modulus of resilience; Pavement design; Rutting; Shear stress; Stiffness; Subgrade (Pavements)

PLAXIS (Computer program)

Zone of influence

Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I33: Other Materials used in Pavement Layers; I42: Soil Mechanics

TRIS, TRB, ATRI

Dec 31 2009 5:15PM

• Automation of Pavement Sublayer Moisture Content Determination Using Long-Term Pavement Performance Time Domain Reflectometry Data and Micromechanics
• Capacities and Deflections of Laterally Loaded Shafts Behind Mechanically Stabilized Earth Wall
• Comparison of Stress States and Paths: Vibratory Roller-Measured Soil Stiffness and Resilient Modulus Testing
• Deformation Factors of Buried Corrugated Structures
• Evaluation of High-Capacity Composite Spun Piles
• Fatigue Evaluation of Porous Asphalt Composites with Carbon Fiber Reinforcement Polymer Grids
• Full-Scale Evaluation of Geosynthetic-Reinforced Aggregate Roads
• Geogrid Base Reinforcement with Aggregate Interlock and Modeling of Associated Stiffness Enhancement in Mechanistic Pavement Analysis
• High-Capacity Piles at the Stony Creek Bridge Project
• Horizontal Drains in a Clay–Landslide Stabilization Test Program
• Instrumented Rollers to Assess Construction Quality on Texas Projects
• North Carolina Department of Transportation’s Practice and Experience with Design–Build Contracts: Geotechnical Perspective
• Stiffness-Based Assessment of Pavement Foundation Materials Using Portable Tools