Overview
ISO/TR 18228-9:2022 provides guidance for the design of geosynthetic barriers (GBRs) used to reduce or prevent fluid migration in geotechnical and civil engineering applications. Part 9 of the ISO 18228 series focuses on barrier performance, material selection and design principles for geomembranes (GBR‑P), geosynthetic clay liners (GBR‑C), and bituminous barriers (GBR‑B). The technical report is written to help designers address durability, site conditions and conflicting performance criteria for long‑life barrier systems.
Key Topics
- Scope and terms: Defines barrier-related terminology consistent with ISO 10318‑1.
- Materials: Guidance on common barrier materials including HDPE, LLDPE, fPP, PVC, EPDM, bitumen and bentonite‑based liners.
- Properties relevant to design: Chemical resistance, physical properties, and durability/weathering considerations that influence barrier selection and expected life.
- Design criteria and principles: Recommendations for subgrade preparation, slope stability, temperature effects (thermal expansion and stiffness), hydraulic uplift, puncture protection and joint durability.
- Applications and pictograms: Standardized pictograms and classification for applications such as containment (non‑landfill), chemical containment, construction waterproofing, landfill base lining and caps, tunnels, transport infrastructure and water‑retaining structures.
- Limit state approach: The series provides guidance framed in a limit state format with suggested partial material and load factors for different applications and design lives.
- Quality assurance: Installation issues, on‑site quality control and testing requirements.
Applications
ISO/TR 18228‑9 is practical for projects where a low‑permeability geosynthetic is required:
- Landfill base liners and caps - controlling leachate and gas migration.
- Chemical and hazardous liquid containment - secondary containment for tanks, bunds and lagoons.
- Construction waterproofing and tunnels - preventing water ingress into underground structures.
- Water‑retaining structures - reservoirs, canals, dams and balancing ponds.
- Transport infrastructure - barrier functions beneath roads and rail to protect subgrade.
Who should use this standard
- Geotechnical and civil engineers designing barrier systems
- Environmental and containment specialists
- Consultants, contractors and asset owners specifying or installing geosynthetic liners
- Regulators and reviewers assessing compliance with best practices for barrier design
Related standards
- ISO 10318‑1: Terms and definitions for geosynthetics
- ISO 10318‑2: Graphical symbols and pictograms for geosynthetic products
Keywords: ISO TR 18228-9, geosynthetic barriers, geomembrane, geosynthetic clay liner, barrier design, landfill lining, chemical containment, construction waterproofing, durability, slope stability.
