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Geonet structure, short-term stress/strain behavior, and creep test methods. Part1: Allowable stress on geonets
Several types of geonets are used in numerous applications worldwide. Examples of the types of geonets include biplanar, triplanar, spiked or profiled, cuspated, tubular, and three-dimensional (3-D) filament meshes. Common and emerging applications for these materials include roadways, heap leach pads, green roofs, landfills, ponds, slopes, walls, and dams. Although several papers have been written on geonet creep, including Thornton et al. (2000), Narejo & Allen (2004), Yeo & Hsuan (2007), there has been little discussion in the geosynthetics literature on the allowable stress on geonets. The validity of such a method for many different types and grades of products is challenging. Since some of the data used in the derivations in the second and third articles in this series are obtained from the Stepped Isothermal Method (SIM), a brief comparison of the accelerated and conventional creep methods is presented in this article. The second and third articles in this three-part series also explain the application of the method with several design examples. The concept of using laboratory creep data to calculate the allowable stress is used currently for geogrids. Similar to geogrids, laboratory creep tests on geonets were performed in isolation without many complicating factors. Lamination to form a geocomposite, soft vs. hard boundaries, hydro-chemical environment, stress inclination, and temperatures can all have an effect on the creep of geonets. Because many such considerations are site-specific, it is hoped that the concept of reduction factors can be used to account for these. The methods presented in this series may be considered to give an approximate value of allowable stress. Although only approximate in nature, it is better than not knowing at all what the stress limits for different types of geonets may be because geonet load capabilities can vary across several orders of magnitude. Compressive strength of a geonet depends on the type of the core and the grade as well as the quality of the specific product. A broad range of products is available to satisfy both the load and the flow rate requirements of projects. The rollover is defined as a collapse of a geonet's structure in a short-term or long-term compression test and is not limited to biplanar geonets Not all types of biplanar geonets exhibit a rollover, as can be seen from the data presented in this series. Procedures for calculating the allowable stress on geonets can be obtained based on relationship among stress, strain, and time derived from laboratory creep tests. These relationships, to be presented in second and third articles in this series, are useful in obtaining an estimate of the load carrying capacity of geonets.
Geonet structure, short-term stress/strain behavior, and creep test methods. Part1: Allowable stress on geonets
Several types of geonets are used in numerous applications worldwide. Examples of the types of geonets include biplanar, triplanar, spiked or profiled, cuspated, tubular, and three-dimensional (3-D) filament meshes. Common and emerging applications for these materials include roadways, heap leach pads, green roofs, landfills, ponds, slopes, walls, and dams. Although several papers have been written on geonet creep, including Thornton et al. (2000), Narejo & Allen (2004), Yeo & Hsuan (2007), there has been little discussion in the geosynthetics literature on the allowable stress on geonets. The validity of such a method for many different types and grades of products is challenging. Since some of the data used in the derivations in the second and third articles in this series are obtained from the Stepped Isothermal Method (SIM), a brief comparison of the accelerated and conventional creep methods is presented in this article. The second and third articles in this three-part series also explain the application of the method with several design examples. The concept of using laboratory creep data to calculate the allowable stress is used currently for geogrids. Similar to geogrids, laboratory creep tests on geonets were performed in isolation without many complicating factors. Lamination to form a geocomposite, soft vs. hard boundaries, hydro-chemical environment, stress inclination, and temperatures can all have an effect on the creep of geonets. Because many such considerations are site-specific, it is hoped that the concept of reduction factors can be used to account for these. The methods presented in this series may be considered to give an approximate value of allowable stress. Although only approximate in nature, it is better than not knowing at all what the stress limits for different types of geonets may be because geonet load capabilities can vary across several orders of magnitude. Compressive strength of a geonet depends on the type of the core and the grade as well as the quality of the specific product. A broad range of products is available to satisfy both the load and the flow rate requirements of projects. The rollover is defined as a collapse of a geonet's structure in a short-term or long-term compression test and is not limited to biplanar geonets Not all types of biplanar geonets exhibit a rollover, as can be seen from the data presented in this series. Procedures for calculating the allowable stress on geonets can be obtained based on relationship among stress, strain, and time derived from laboratory creep tests. These relationships, to be presented in second and third articles in this series, are useful in obtaining an estimate of the load carrying capacity of geonets.
Geonet structure, short-term stress/strain behavior, and creep test methods. Part1: Allowable stress on geonets
Narejo, Dhani (author) / Allen, Sam (author)
Geosynthetics ; 32 ; 36-41
2014
6 Seiten, Bilder, Tabellen, Quellen
Article (Journal)
English
British Library Online Contents | 2018
LONG TERM, COMPRESSIVE CREEP BEHAVIOR OF HIGH DENSITY POLYETHYLENE GEONET
| British Library Conference Proceedings | 2000
Environmental Stress Cracking in Geonets Manufactured from High Density Polyethylene
| British Library Conference Proceedings | 1999
RELATIONSHIP BETWEEN SHORT-TERM COMPRESSION STRENGTH AND TRANSMISSIVITY PROPERTIES OF GEONETS
| British Library Conference Proceedings | 2008