Case Study on the Application of Geotextile in Soft Soil Foundation Treatment for Airport Runway Projects
More Names for Soft Soil Foundation Geotextile
Case Study on the Application of Geotextile in Soft Soil Foundation Treatment for Airport Runway Projects
Ⅰ. Project Overview
The runway expansion area is underlain by a deep peat bog layer (containing decomposed tree trunks, high organic content, and high compressibility). Traditional excavation-and-replacement methods would incur extremely high costs and long construction durations. Therefore, geosynthetic materials are required to achieve cost-effective reinforcement and separation.
Ⅱ. Details of Geotextile Application
Product Specification: DuraForce® AS410 filament geotextile (TNZ F7 C class, high puncture resistance, high tensile strength)
Application Locations: Full coverage over the peat bog surface; separation between the rigid fill layer and the peat layer; wrapping for slope drainage systems
Installation Process: Removal of surface-decayed tree trunks → leveling and compaction of the peat layer → full-width laying of geotextile (lap joints ≥ 300 mm) → seam stitching → placement of 500 mm thick hard crushed stone fill → layered compaction → construction of base and surface layers
Quantity Used: Approximately 12,000 m² installed cumulatively
Ⅲ. Core Functions of Geotextile
Isolation and Separation: Prevents the upper rigid crushed stone from penetrating into the peat layer, and stops organic peat materials from mixing into the fill, thereby maintaining structural stability.
Reinforcement: Utilizes high tensile strength (tensile strength at break ≥ 80 kN/m) to constrain deformation of the peat layer, reducing differential settlement.
Drainage and Filtration: Drains pore water from the peat layer, accelerating consolidation and improving subgrade bearing capacity.
Puncture Resistance and Protection: Resists penetration from sharp edges of crushed stone, ensuring the integrity of the separation layer.
Ⅳ. Implementation Results
Subgrade Stability: Post-construction settlement ≤ 30 mm, with no differential settlement observed, meeting the heavy-load requirements of aircraft operations.
Cost Savings: Compared to full excavation-and-replacement, costs reduced by 60%, and construction duration shortened by 50%.
Long-Term Performance: After 5 years of service, the geotextile shows no damage or aging, the subgrade remains deformation-free, and the pavement surface is intact.
