BSI PD ISO/TR 18228-3:2021

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Design using geosynthetics – Filtration

Published By	Publication Date	Number of Pages
BSI	2021	30

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Categories: 59.080.70 - Geotextiles, BSI

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This document provides general considerations to support the design guidance to geotechnical and civil engineers involved in the design of structures in which a geotextile is used as a filter. The key potential failure mechanisms are described, and guidance is proposed to select engineering properties.

PDF Catalog

PDF Pages	PDF Title
2	undefined
6	Foreword
8	Introduction
9	1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions 3.2 Symbols
10	3.3 Abbreviated terms 4 Concepts and fundamental principles 4.1 General
11	4.2 The filtration function of geotextiles
12	4.3 Filter selection fundamentals 5 Typical applications 5.1 General considerations
13	5.2 Soil filtration 5.3 Slurry filtration 6 Materials
16	7 Functional properties relevant to design 7.1 Characteristic opening size
17	7.2 Velocity index and permittivity (permeability) 7.3 Resistance to water penetration 7.4 Number of constrictions 7.5 Percent open area
18	8 Principles of design 8.1 General considerations
21	8.2 Designing geotextiles for soil filtration 8.2.1 General 8.2.2 Retention criteria of the soil skeleton
22	8.2.3 Non-retention criteria of fines in suspension 8.2.4 Permeability criteria 8.3 Designing geotextiles for slurry and suspended solids filtration
23	9 Testing the soil/geotextile filtration compatibility 9.1 General 9.2 Soil/geotextile compatibility 9.2.1 Gradient ratio
24	9.2.2 Hydraulic conductivity ratio 9.2.3 Retention performance of geotextiles exposed to turbulent flow conditions 9.3 Evaluation of slurry/geotextile behaviour 9.4 Biological or chemical clogging potential
25	9.5 Impact of abrasion on the filtration properties of geotextiles 9.5.1 Abrasion resistance – Index property 9.5.2 Abrasion resistance – Rotary drum method 10 Examples of material specifications and design guidance
27	Bibliography