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Geosystems: Design Rules and Applications

Edited by Adam Bezuijen, E.W. Vastenburg

CRC Press – 2013 – 164 pages

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    978-0-415-62148-9
    November 14th 2012

Description

Geotextile encapsulated sand elements are three-dimensional systems manufactured from textile materials, non-woven materials or combinations of textile and non-woven materials that are filled with sand on-site. These systems are relatively new and the number of applications is growing in river and coastal engineering. Quite often Geosystems are mentioned as a possible solution, but planners, designers and contractors feel rather hesitant about the application of geotextile encapsulated sand elements due to a lack of experience and adequate design rules.

The use of geosystems has the advantage that local material can be applied and that no (expensive) quarry stone needs to be extracted and transported from the mountains to the site. Compared to traditional construction methods (with quarry stone) the application of geotextile sand filled elements may add considerable operational advantages to the execution of marine works and may offer attractive financial opportunities. In the application of geotextile encapsulated sand elements however, proper attention should be paid to the laying down of different responsibilities of the parties in the contract.

In Geosystems. Design Rules and Applications four types of geotextile sand elements are distinguished, each with specific properties: geo-bags, geo-mattresses, geotextile tubes and geotextile containers. The focus is on the use of geosystems filled with sand as a construction in river and coastal engineering. Geosystems filled with sludge are not covered. The chapters “Introduction” and “General design aspects” are followed by four chapters of the same structure dealing with the various systems. Each of these four chapters starts with a general description and applications and ends with a calculation example. Design aspects are dealt with in the remaining paragraphs.

Geosystems. Design Rules and Applications is based on research commissioned by the Dutch Rijkswaterstaat and Delft Cluster. The realisation of the Dutch version was coordinated by a CUR-committee. The English version is a translation of the Dutch version (CUR-publication 217). However, new developments have been added and the text was checked once again and improved. Geosystems. Design Rules and Applications is an essential reference for professionals and academics interested in River and Coastal Engineering, but aims also at those interested in Geotechnical Engineering.

Contents

1. Introduction

Why there is a need for design rules for geotextile-encapsulated sand elements

Document structure

2. General design aspects

Basic principles of geotextile-encapsulated sand elements

Design approach

Safety considerations

Introduction

Deterministic method

Potential failure mechanisms

Material aspects of geotextiles

Raw materials

Sand tightness

Permeability

Tensile strength and strain

Seams

Damage during installation of gravel layers

Durability

CE marking

3. Geotextile bags

Application and general experimental data

Installation procedure

Geometric design

Failure modes and safety considerations

Design aspects

Material choice

Required tensile strength

Stability in waves

Stability when subject to longitudinal current flows

Stability when subject to overtopping currents

Stability of geotextile bags placed in mounds

Construction aspects

Calculation example

4. Geotextile mattresses

Application areas and general experimental data

Installation procedure

Geometric design

Potential failure mechanisms and safety considerations

Design aspects

Material choice

Required tensile strength

Stability in waves

Stability in longitudinal currents

Geotechnical stability

Construction aspects

Calculation example

5. Geotextile tubes

Applications and general experimental data

Installation procedure

General

Pump speed and pump capacity

Fill material

Geometric design

Failure mechanisms and safety considerations

Design aspects

Material choice and fabrication

Required tensile strength

Stability

Construction aspects

Calculation example

6. Geotextile containers

Application areas and general experimental data

Installation procedure

General

Fill methodology

Fill material

Degree of filling

Geometric design

Failure mechanisms and safety considerations

Design aspects

Material choice

Loading on geotextile while opening the split barge

Loading on geotextile upon impact on the bottom

Required tensile strength

Stability in waves

Stability in currents over the structure

Stacking stability

Influence of wave-induced liquefaction

Placement accuracy

Construction aspects

Calculation example

Appendix A:Permeability of geotextiles

Appendix B:CE marking

Appendix C:Design charts for the geotechnical stability of geotextile mattresses and geotextile bags on slope revetments

Appendix D:Dimensions and shape of geotextile tubes

Appendix E:Shape and forces in geotextile tubes (Timoshenko method)

Appendix F:Tensile load in geotextile container during the opening of the split barge

Appendix G:Fall velocity of the geotextile container

Appendix H:Placement accuracy for geotextile containers

Name: Geosystems: Design Rules and Applications (Hardback)CRC Press 
Description: Edited by Adam Bezuijen, E.W. Vastenburg. Geotextile encapsulated sand elements are three-dimensional systems manufactured from textile materials, non-woven materials or combinations of textile and non-woven materials that are filled with sand on-site. These systems are relatively new and the...
Categories: Geomechanics, Tunnelling & Underground Engineering