Quantifying the Influence of Geosynthetics on Pavement Performance (2017) / Chapter Skim
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124 CHAPTER 5. INTERPRETATIONS, APPRAISAL, AND APPLICATIONS Introduction This project developed a methodology for quantifying the influence of geosynthetics on pavement performance.
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125 Table 5.1. Summary of Specifics of LST Experiments on Flexible Pavements Experiment Surface Layer Thick.
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126 Table 5.2. Summary of Specifics of LST Experiments on Rigid Pavements Experiment Surf.
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127 Measurement of Geosynthetic-Aggregate/Soil Interfacial Slippage The slippage at the geosynthetic-aggregate/soil interface significantly affected the geosynthetic-UGM interaction. The horizontal slippage was calculated as the difference in horizontal displacements between the geosynthetic and the adjacent UGM using the calibrated double-integration procedure that is explained in Appendix I
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128 Figure 5.2. Measured Horizontal Displacements of Geogrid and UGM When Geogrid Was Placed at the Bottom of the Base Course Figure 5.3.
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129 Figure 5.4. Measured Horizontal Displacements of Geotextile and UGM When Geotextile Was Placed at the Bottom of the Base Course Determination of Geosynthetic-Aggregate/Soil Interfacial Properties The interfacial shear stiffness was an important property for characterizing the geosynthetic-aggregate/soil interaction behavior.
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130 Figure 5.5. Horizontal and Vertical Moduli of Unreinforced UGM at Each Stress State Figure 5.6.
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131 Figure 5.7. Effect of Geosynthetics on Vertical Modulus of UGM Figure 5.8.
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132 deformation of the UGM. The effect of geogrid reinforcement was not significant in reducing the permanent deformation until the deviatoric shear stress reached a threshold level (e.g., σd = 19 psi in this study)
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Figure Figur 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 A cc um ul at ed P la st ic S tr ai n (% )
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Figure Analytic A permanen state. In t was equi of a UGM influence Figures 5 horizonta 0.0 0.2 0.4 0.6 0.8 1.0 A cc um ul at ed P la st ic S tr ai n (% )
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135 Figure 5.13. Effect of Geosynthetic Sheet Stiffness on Predicted Horizontal Modulus of UGM Figure 5.14.
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136 effect was simulated by defining the geosynthetic as a membrane element and characterizing the geosynthetic-aggregate/soil interface interaction using the Goodman model (43)
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137 Figure 5.15. Effect of Base Modulus on Average Compressive Strain in Base Layer Figure 5.16.
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138 Figure 5.17. Effect of Subgrade Modulus on Average Compressive Strain in Base Layer Figure 5.18.
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139 Figure 5.19. Effect of Tensile Sheet Stiffness of Geogrid on Average Compressive Strain in Base Layer Figure 5.20.
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140 Pavement ME Design software. Figures 5.21–5.23 compare the effect of the base modulus on the predicted performance of geosynthetic-reinforced and unreinforced pavements after 10-year service in College Station, Texas.
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141 Figure 5.23. Effect of Base Modulus on IRI of Geosynthetic-Reinforced and Unreinforced Pavements Figure 5.24.
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142 Figure 5.25. Effect of Subgrade Modulus on Fatigue Cracking of Geosynthetic-Reinforced and Unreinforced Pavements Figure 5.26.
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143 Figure 5.27. Effect of Sheet Stiffness of Geogrid on Rutting Depth of Reinforced Pavements Figure 5.28.
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144 Figure 5.29. Effect of Sheet Stiffness of Geogrid on IRI of Reinforced Pavements 80 85 90 95 100 Control Sheet Stiffness=1200 lb/in Sheet Stiffness=2400 lb/in Sheet Stiffness=3600 lb/in In te rn at io na l R ou gh ne ss In de x (in /m i)
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