Pavement and Subgrade Engineering Design Report
1. Basic Information
- Course: Pavement and Subgrade Engineering
- Project: Gravity Retaining Wall and Asphalt Pavement Structure Design
- Student Name: [Your Name]
- Student ID: [Your ID]
- Instructor: [Instructor's Name]
- Date: June 2025
2. Design Tasks
1) Design a gravity retaining wall for roadside protection.
2) Design the asphalt pavement structure, including material selection and layer thickness.
3) Draw design drawings.
4) Provide complete calculation sheets and explanatory text.
3. Gravity Retaining Wall Design
3.1 Design Parameters
- Wall Height: H = 5.0 m
- Soil Unit Weight: gamma = 18 kN/m³
- Internal Friction Angle: phi = 30 degrees
- Sliding Resistance Coefficient: mu = 0.6
- Backfill Slope: Horizontal
Page 1
Pavement and Subgrade Engineering Design Report
3.2 Stability Checks
- Overturning stability
- Sliding stability
- Foundation bearing capacity
4. Asphalt Pavement Structure Design
4.1 Design Traffic and Grade
- AADT: 8000 vehicles/day
- Design Life: 15 years
- Road Grade: Secondary Highway, Two-lane
4.2 Pavement Layer Selection
- Surface Layer: AC-16 Modified Asphalt, 5cm
- Upper Base: Cement-stabilized Crushed Stone, 18cm
- Lower Base: Graded Crushed Stone, 20cm
- Subbase: Natural Gravel, 20cm
4.3 Design Methodology
- Based on JTG D50-2017 Specifications
- Equivalent axle load conversion method
- Layered elastic theory
5. Drawing Descriptions (Attached)
- Retaining wall structure drawing
- Pavement structure cross-section
Page 2
Pavement and Subgrade Engineering Design Report
- Subgrade cross-section
6. Conclusion
This design project enabled me to understand:
- Structural design and stability checks of retaining walls
- Pavement design methodology including load analysis and material selection
- Practical skills in drafting and engineering design documentation
Page 3