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A Finite Element Model for Simulating Stress Responses of Permeable Road Pavement
Jhu-Han Siao1, Tung-Chiung Chang2, Yu-Min Wang3
1Department of Civil Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan.
Materials (Basel, Switzerland)
|June 27, 2024
Summary
Simulating permeable road pavements with a 3D finite element model shows lower speeds increase stress, negatively impacting performance. Increasing layer moduli and a 30 cm design depth are recommended for permeable pavements in low-speed traffic areas.
Area of Science:
- Civil Engineering
- Materials Science
- Geotechnical Engineering
Background:
- Permeable road pavements offer environmental benefits but have limited structural strength, restricting their use.
- Accurate simulation of stress parameters is crucial for expanding the application of permeable pavements.
Purpose of the Study:
- To develop and validate a 3D finite element model for simulating stress responses in permeable road pavements.
- To investigate the impact of wheel speed on pavement stress at various depths.
Main Methods:
- A 3D finite element (3D FE) model was developed using ABAQUS/CAE 2021.
- The model was calibrated and validated using a 53 cm permeable pavement and a 315/80 R22.5 wheel, with accuracy confirmed via t-test analysis.
- Simulations were conducted at wheel speeds of 11, 15, and 22 m/s.
Main Results:
- Wheel speed significantly impacted pavement stress at depths of 3 cm and 8 cm, with minimal effects at 13 cm and 33 cm.
- Stress responses varied between the open-graded asphalt concrete (OGFC) surface and porous asphalt concrete (PAC) base layers due to differing elastic moduli.
- Lower speeds increased stress responses and prolonged action times, negatively affecting pavement performance.
Conclusions:
- Increasing the elastic moduli of pavement layers is recommended for permeable pavements subjected to low-speed traffic.
- A design depth of 30 cm is recommended for permeable road pavements, considering heavy loads and wheel speed variations.
- The findings offer a reference for designing climate-resilient and high-performance permeable pavements.
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