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Geosynthetic reinforcement stiffness for analytical and numerical modelling of reinforced soil structures
Geotextiles and Geomembranes ( IF 5.2 ) Pub Date : 2021-03-21 , DOI: 10.1016/j.geotexmem.2021.01.003
Richard J. Bathurst , Fahimeh M. Naftchali

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.



中文翻译:

用于加筋土结构分析和数值模拟的土工合成材料加筋刚度

许多土工合成材料加筋土结构的分析和数值分析和设计方法需要对加筋刚度进行单值(常数)估计。然而,土工合成材料加固产品是速率相关的聚合物材料,这意味着它们在负载下表现出时间和应变相关的行为。Hence, the appropriate selection of a constant (elastic) stiffness value requires careful consideration. 一个简单的双曲线刚度模型被证明是这些材料在低载荷水平下的恒定载荷等时蠕变应变行为的有用近似,适用于土工合成材料加固土壤结构的操作(适用性)条件。收集了一个包含 606 次蠕变试验的大型数据库,其中包含 7 种不同产品类别中的 89 种不同土工合成材料增强材料产品。从这些数据中,可以确定加载持续时间和应变水平的不同组合的等时刚度值。来自同一类别产品的数据被收集在一起,以提供将等时载荷-应变(蠕变)刚度与材料的极限抗拉强度联系起来的近似值。这些近似值对于分析和数值建模非常有用,尤其是在进行参数研究以确定模型结果对钢筋刚度的敏感性时。最后,提供了三个不同的土工合成材料加筋土应用示例,以证明拉伸刚度对分析和设计结果的重要作用。来自同一类别产品的数据被收集在一起,以提供将等时载荷-应变(蠕变)刚度与材料的极限抗拉强度联系起来的近似值。这些近似值对于分析和数值建模非常有用,尤其是在进行参数研究以确定模型结果对钢筋刚度的敏感性时。最后,提供了三个不同的土工合成材料加筋土应用示例,以证明拉伸刚度对分析和设计结果的重要作用。来自同一类别产品的数据被收集在一起,以提供将等时载荷-应变(蠕变)刚度与材料的极限抗拉强度联系起来的近似值。这些近似值对于分析和数值建模非常有用,尤其是在进行参数研究以确定模型结果对钢筋刚度的敏感性时。最后,提供了三个不同的土工合成材料加筋土应用示例,以证明拉伸刚度对分析和设计结果的重要作用。这些近似值对于分析和数值建模非常有用,尤其是在进行参数研究以确定模型结果对钢筋刚度的敏感性时。最后,提供了三个不同的土工合成材料加筋土应用示例,以证明拉伸刚度对分析和设计结果的重要作用。这些近似值对于分析和数值建模非常有用,尤其是在进行参数研究以确定模型结果对钢筋刚度的敏感性时。最后,提供了三个不同的土工合成材料加筋土应用示例,以证明拉伸刚度对分析和设计结果的重要作用。

更新日期:2021-03-21
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