Introduction

The ISO 18228 series provides guidance for designs using geosynthetics for soils and below ground structures in contact with natural soils, fills and asphalt. The series contains 10 parts which cover designs using geosynthetics, including guidance for characterization of the materials to be used and other factors affecting the design and performance of the systems which are particular to each part, with ISO/TR 18228‑1 providing general guidance relevant to the subsequent parts of the series.

The series is generally written in a limit state format and guidelines are provided in terms of partial material factors and load factors for various applications and design lives, where appropriate.

For each of the design considerations, the characteristics of the geosynthetics and the test methods normally used to quantify the properties of the geosynthetics are described. Some regional specific rules and regulations that normally apply to designs using geosynthetics in these regions are also mentioned.

This document contains recommendations and guidance for the design of geosynthetic barriers in geotechnical applications. The standard provides design guidance over various applications, design lives, material types, parameters and site-specific conditions. Professional judgement is needed in all designs. Be aware that national regulations might apply. This document is intended to assist in the process, by identifying parameters which are relevant.

Design using geosynthetic barriers (GBRs) takes into account the nature of the material in contact with the GBR, both underneath (the substrate), alongside and on top (the contained substances). As the primary function of a GBR is to retain or exclude fluids, primary issues in design relate to its ability to perform this function. Often, but not always, GBR materials are incorporated into structures with an extensive life expectancy and therefore the material's durability (its ability to continue to perform its primary function over time) is critical.

Balancing the combination of often conflicting performance criteria and different GBR materials to the proposed installation is always a complex matter. This inevitably comes down to professional judgement. This document does not set out to and cannot solve this potential conflict but seeks to assist the designer in identifying and clarifying the various components of the decision-making process by identifying existing standards for comparisons of individual parameters and giving some direction on prioritization in various applications as well as conflicting performance characteristics which may be encountered.

PD ISO/TR 18228-9:2022

Design using geosynthetics - Barriers

Current

Published:

30 Jun 2022