Hornsey W.P.,Geofabrics Australasia Pty Ltd. |
Scheirs J.,ExcelPlas Geomembrane Testing Services |
Gates W.P.,Monash University |
Bouazza A.,Monash University
Geotextiles and Geomembranes | Year: 2010
Mine owners and operators are presented today with a diverse range of geosynthetic products which all appear to provide similar benefits. Key factors in selecting geosynthetics for use in the mining industry include construction and operational durability issues such as slope stability, puncture resistance and resistance to weathering; but also their chemical resistance when they come into contact with the extreme liquors present on many mining operations and processes. The long-term performance of the geosynthetic depends largely on the type of polymer used in the manufacture, or in the case of geosynthetic clay liners (GCLs), also on the mineralogy and chemical make of the bentonite present in the GCL. This paper provides a guide to the characteristics of the leachates/liquors likely to be generated for a given mining process and the likely effect it will have on the performance of a given geosynthetic. © 2009 Elsevier Ltd. All rights reserved.
Cheah C.,Queensland University of Technology |
Gallage C.,Queensland University of Technology |
Dawes L.,Queensland University of Technology |
Kendall P.,Geofabrics Australasia Pty. Ltd
Geotextiles and Geomembranes | Year: 2016
Over the last few decades, geotextiles have progressively been incorporated into geotechnical applications, especially in the field of coastal engineering. Geotextile materials often act as separator and a filter layer between rocks laid above and subgrade beneath. This versatile material has gradually substituted traditional granular materials because of its ease of installation, consistent quality and labour cost-efficiency. However, geotextiles often suffer damage during installation due to high dynamic bulk loading of rock placement. This can degrade geotextiles' mechanical strength. The properties considered in this paper include the impact resistance and retained strength of geotextiles. In general, the greater the impact energy applied to geotextiles, the greater the potential for damage. Results highlight the inadequacy of using index derived values as an indicator to determine geotextile performance on site because test results shows that geotextiles (staple fibre (SF) and continuous filament (CF)) with better mechanical properties did not outperform lower mechanical strength materials. The toughest CF product with a CBR index value of 9696N shows inferior impact resistance compared to SF product with the least CBR strength (2719N) given the same impact energy of 9.02 kJ. Test results also indicated that the reduction of strength for CF materials were much greater (between 20 and 50%) compared to SF materials (between 0 and 5%) when subjected to the same impact energy of 4.52 kJ. © 2016 Elsevier Ltd.
Hornsey W.P.,Geofabrics Australasia Pty Ltd |
Carley J.T.,University of New South Wales |
Coghlan I.R.,University of New South Wales |
Cox R.J.,University of New South Wales
Geotextiles and Geomembranes | Year: 2011
The use geotextile sand containers (GSCs) as shoreline protection systems, has grown moderately since the first applications in the 1970s. This slow growth can be attributed to two factors; firstly, the lack of understanding of coastal processes and design fundamentals by the larger geosyntheticcommunity in order to provide coastal engineers with suitable solutions, and secondly; there has been very little rigorous scientific wave flume testing with which to analyse the wave stability of geotextile sand containers. The application of geotextile containers in coastal protection works can be traced back to early works carried out in 1970s. The application of these types of structures was somewhat haphazard as very little was understood about the wave stability and durability of the structures. Early wave stability work was carried out Ray (1977) and Jacobs (1983) with small containers, however, the testing programs were limited and did not provide sufficient confidence in the product to carry out exhaustive engineering design. As a result, the technology until recently has relied on manufacturers' design suggestions based on monitoring of actual structures. Over the past five years, coastal population pressure, extreme events and concerns over climate change and sea level rise have resulted in more emphasis being placed on shoreline protection systems. Geotextile manufacturers have responded to the challenges put forward by design engineers and intensive research has been carried out in the field. This paper outlines the current " state of the art" in terms of the design and specification of geotextile sand containers (GSC). This paper covers the key issues which will ensure the long term integrity of a geotextile shoreline protection system is maintained, these issues include:. • Container stability;. • Detailed analysis of recent large scale wave flume testing which assess filling capacity, size of container, structure slope and scour protection etc.;. • Container/geotextile durability;. • Methods and specifications used to limit the effects of the fundamental factors affecting the life span of geotextile containers such as vandal resistance, UV degradation and abrasion resistance etc. © 2011.
Austin R.A.,Geofabrics Australasia Pty Ltd. |
Gibbs D.T.,Geofabrics Australasia Pty Ltd. |
Kendall P.M.,Geofabrics Australasia Pty Ltd.
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014
The use of geotextiles as protection layers for geomembranes in lining applications is a common use for geotextiles and minimising installation damage, in-service damage and geomembrane strain is critical for the long-term performance of the lining system. In such applications, protection of the membrane from localised point loads caused by the overlying drainage stone thus minimising potential for environmental stress cracking is desirable, if the long-term performance of the liner is to be assured. The paper reports on the extensive testing of different types of geotextiles for liner protection applications. The testing reported followed the ASTM D5514-06 test procedure modified to include the use of a fixed stone profile and uniform pneumatic load application. To ensure a consistent stone arrangement and loading onto the liner, fixed stone profiles were created using fibre-reinforced resin to hold the drainage stone in a rigid arrangement, yet provide a natural stone surface texture similar to that of stone as placed on site. Using this approach, different liner and geotextile combinations could be tested against the same stone profile and loading conditions, thus enabling easy comparison of damage and recorded strain. Test results are presented and compared for both staple fibre and continuous filament geotextiles and the effect of different polymer types is discussed.
Hornsey W.P.,Geofabrics Australasia Pty Ltd |
Wishaw D.M.,Geofabrics Australasia Pty Ltd
Geotextiles and Geomembranes | Year: 2012
The protection of liners in landfill sites is of the utmost importance in the calculation of the usable design life of a landfill system. This research presents the establishment of an improved method for analysing the strain induced on a geomembrane using laser scanning technology to better determine the design life of the geomembrane. The ability to reproduce results with a high degree of accuracy under a range of test conditions was investigated. The results of this research showed that the use of high-definition laser scanning techniques produces repeatable and highly accurate results allowing precise indication of potential stress crack failure while providing a realistic comparison of cushion geotextile performance. © 2012 Elsevier Ltd.