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Geosynthetic reinforcement stiffness for analytical and numerical modelling of reinforced soil structures
Abstract Many analytical and numerical analysis and design methods for geosynthetic-reinforced soil structures require a single-value (constant) estimate of reinforcement stiffness. However, geosynthetic reinforcement products are rate-dependent polymeric materials meaning that they exhibit time and strain-dependent behaviour under load. Hence, the appropriate selection of a constant (elastic) stiffness value requires careful consideration. A simple hyperbolic stiffness model is shown to be a useful approximation to the constant-load isochronous creep-strain behaviour of these materials at low load levels applicable to operational (serviceability) conditions of geosynthetic-reinforced soil structures. A large database of 606 creep tests on 89 different geosynthetic reinforcement products falling within seven different product categories was collected. From these data, isochronous stiffness values were determined for different combinations of duration of loading and strain level. Data from products falling within the same category were collected together to provide approximations linking the isochronous load-strain (creep) stiffness to the ultimate tensile strength of the material. These approximations are useful for analytical and numerical modelling particularly when parametric studies are undertaken to identify the sensitivity of model outcomes to reinforcement stiffness. Finally, three different geosynthetic-reinforced soil application examples are provided to demonstrate the important role of tensile stiffness on analysis and design outcomes.
Highlights A simple hyperbolic model is developed for the isochronous load-strain (creep) behaviour of geosynthetic reinforcement materials. The model is used to estimate reinforcement stiffness at low load levels consistent with operational conditions of reinforced soil systems. Model parameters are fitted from a large database of creep tests on geosynthetic reinforcement materials from different product categories. Approximations linking the isochronous load-strain (creep) stiffness to the ultimate tensile strength of the material are provided. Three different geosynthetic-reinforced soil examples demonstrate the important role of tensile stiffness on analysis and design outcomes.
Geosynthetic reinforcement stiffness for analytical and numerical modelling of reinforced soil structures
Abstract Many analytical and numerical analysis and design methods for geosynthetic-reinforced soil structures require a single-value (constant) estimate of reinforcement stiffness. However, geosynthetic reinforcement products are rate-dependent polymeric materials meaning that they exhibit time and strain-dependent behaviour under load. Hence, the appropriate selection of a constant (elastic) stiffness value requires careful consideration. A simple hyperbolic stiffness model is shown to be a useful approximation to the constant-load isochronous creep-strain behaviour of these materials at low load levels applicable to operational (serviceability) conditions of geosynthetic-reinforced soil structures. A large database of 606 creep tests on 89 different geosynthetic reinforcement products falling within seven different product categories was collected. From these data, isochronous stiffness values were determined for different combinations of duration of loading and strain level. Data from products falling within the same category were collected together to provide approximations linking the isochronous load-strain (creep) stiffness to the ultimate tensile strength of the material. These approximations are useful for analytical and numerical modelling particularly when parametric studies are undertaken to identify the sensitivity of model outcomes to reinforcement stiffness. Finally, three different geosynthetic-reinforced soil application examples are provided to demonstrate the important role of tensile stiffness on analysis and design outcomes.
Highlights A simple hyperbolic model is developed for the isochronous load-strain (creep) behaviour of geosynthetic reinforcement materials. The model is used to estimate reinforcement stiffness at low load levels consistent with operational conditions of reinforced soil systems. Model parameters are fitted from a large database of creep tests on geosynthetic reinforcement materials from different product categories. Approximations linking the isochronous load-strain (creep) stiffness to the ultimate tensile strength of the material are provided. Three different geosynthetic-reinforced soil examples demonstrate the important role of tensile stiffness on analysis and design outcomes.
Geosynthetic reinforcement stiffness for analytical and numerical modelling of reinforced soil structures
Bathurst, Richard J. (author) / Naftchali, Fahimeh M. (author)
Geotextiles and Geomembranes ; 49 ; 921-940
2021-01-20
20 pages
Article (Journal)
Electronic Resource
English
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