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PD ISO/TR 20432:2007

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Guidelines for the determination of the long-term strength of geosynthetics for soil reinforcement

Available format(s)

Hardcopy , PDF

Superseded date

06-02-2023

Superseded by

PD ISO/TS 20432:2022

Language(s)

English

Published date

30-05-2008

€254.76
Excluding VAT

Foreword
1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols
   3.1 Terms and definitions
   3.2 Abbreviated terms
   3.3 Symbols
4 Design procedure
   4.1 Introduction
   4.2 Design lifetime
   4.3 Causes of degradation
   4.4 Design temperature
5 Determination of long-term (creep) strain
   5.1 Introduction
   5.2 Extrapolation
   5.3 Time-temperature superposition methods
   5.4 Isochronous curves
   5.5 Weathering, chemical and biological effects
6 Determination of long-term strength
   6.1 Tensile strength
   6.2 Reduction factors
   6.3 Modes of degradation
7 Creep rupture
   7.1 Introduction
   7.2 Measurement of creep rupture: conventional method
   7.3 Curve fitting (conventional method)
   7.4 Curve fitting for time-temperature block shifting of
        rupture curves
   7.5 Strain shifting and the stepped isothermal method
   7.6 Extrapolation and definition of reduction factor or
        lifetime
   7.7 Residual strength
   7.8 Reporting of results
   7.9 Procedure in the absence of sufficient data
8 Installation damage
   8.1 General
   8.2 Data recommended
   8.3 Calculation of reduction factor
   8.4 Procedure in the absence of direct data
9 Weathering, chemical and biological degradation
   9.1 Introduction
   9.2 Data recommended for assessment
   9.3 Weathering
   9.4 Chemical degradation
   9.5 Biological degradation
10 Determination of long-term strength
   10.1 Factor of safety f[s]
   10.2 Design for residual strength
11 Reporting
Bibliography

Gives guidelines for the determination of the long-term strength of geosynthetics for soil reinforcement.

Committee
B/553
DocumentType
Standard
Pages
38
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

This Technical Report provides guidelines for the determination of the long-term strength of geosynthetics for soil reinforcement.

This Technical Report describes a method of deriving reduction factors for geosynthetic soil-reinforcement materials to account for creep and creep rupture, installation damage and weathering, and chemical and biological degradation. It is intended to provide a link between the test data and the codes for construction with reinforced soil.

The geosynthetics covered in this Technical Report include those whose primary purpose is reinforcement, such as geogrids, woven geotextiles and strips, where the reinforcing component is made from polyester (polyethylene terephthalate), polypropylene, high density polyethylene, polyvinyl alcohol, aramids and polyamides 6 and 6,6. This Technical Report does not cover the strength of joints or welds between geosynthetics, nor whether these might be more or less durable than the basic material. Nor does it apply to geomembranes, for example, in landfills. It does not cover the effects of dynamic loading. It does not consider any change in mechanical properties due to soil temperatures below 0°C, nor the effect of frozen soil. The Technical Report does not cover uncertainty in the design of the reinforced soil structure, nor the human or economic consequences of failure.

Any prediction is not a complete assurance of durability.

Standards Relationship
ISO/TR 20432:2007 Identical

09/30093258 DC : DRAFT JUNE 2009 BS 8006-1 - CODE OF PRACTICE FOR STRENGTHENED/REINFORCED SOILS AND OTHER FILLS
BS 8006-1(2010) : 2010 CODE OF PRACTICE FOR STRENGTHENED/REINFORCED SOILS AND OTHER FILLS

ISO 13438:2004 Geotextiles and geotextile-related products Screening test method for determining the resistance to oxidation
ISO 10319:2015 Geosynthetics — Wide-width tensile test
BS 8006:1995 Code of practice for strengthened/reinforced soils and other fills
EN 12224:2000 Geotextiles and geotextile-related products - Determination of the resistance to weathering
ISO 9080:2012 Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation
ISO/TR 12960:1998 Geotextiles and geotextile-related products Screening test method for determining the resistance to liquids
EN 12225:2000 Geotextiles and geotextile-related products - Method for determining the microbiological resistance by a soil burial test
ISO 13437:1998 Geotextiles and geotextile-related products Method for installing and extracting samples in soil, and testing specimens in laboratory
ISO/TR 13434:1998 Geotextiles and geotextile-related products Guidelines on durability
ISO 10318:2005 Geosynthetics Terms and definitions
ISO 13431:1999 Geotextiles and geotextile-related products — Determination of tensile creep and creep rupture behaviour
ASTM D 6992 : 2016 : REDLINE Standard Test Method for Accelerated Tensile Creep and Creep-Rupture of Geosynthetic Materials Based on Time-Temperature Superposition Using the Stepped Isothermal Method
ISO 10722:2007 Geosynthetics Index test procedure for the evaluation of mechanical damage under repeated loading Damage caused by granular material

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