Lateral restraint is the primary stabilization mechanism associated with the interlocking of aggregate particles in the geogrid apertures. This paper presents findings from a laboratory study which quantifies the local stiffness enhancement of aggregates through micromechanical interlocking provided by two different types of geogrids. These findings are applied to model the resilient response characteristics of geogrid-stabilized base course composite systems. Using three pairs of bender elements as shear wave transducers, horizontal stiffness profiles were determined above mid-heights of aggregate specimens. For two types of geogrids with square- and triangular-shaped apertures, the shear modulus profiles decreased moving away from the geogrid location. Based on a relationship for aggregates, resilient modulus was estimated from the shear modulus. Considering the variations in resilient moduli with distance from the geogrid location, the local stiffness enhancements provided by the two geogrid types were assigned to modulus profiles of a geogrid-stabilized aggregate base course in flexible pavement mechanistic analysis and modeling. The modeling results demonstrate the effect of geogrid base stabilization on the computed pavement resilient responses for both geogrid types. The sublayering approach which properly considers modeling of the geogrid influence zone could be effectively used in mechanistic analysis of a geogrid-stabilized pavement system.

中文翻译：

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考虑局部刚度增强的土工格栅稳定骨料基层建模

横向约束是与土工格栅孔中骨料颗粒互锁相关的主要稳定机制。本文介绍了一项实验室研究的结果，该研究通过两种不同类型的土工格栅提供的微机械联锁来量化骨料的局部刚度增强。这些发现应用于模拟土工格栅稳定基层复合系统的弹性响应特性。使用三对弯曲元件作为剪切波换能器，在骨料样本的中间高度上方确定水平刚度分布。对于具有方形和三角形孔的两种类型的土工格栅，剪切模量分布随着远离土工格栅位置而减小。根据骨料的关系，根据剪切模量估算弹性模量。考虑到弹性模量随距土工格栅位置距离的变化，两种土工格栅类型提供的局部刚度增强被分配给柔性路面力学分析和建模中土工格栅稳定骨料基层的模量剖面。建模结果证明了土工格栅基础稳定性对两种土工格栅类型计算的路面弹性响应的影响。适当考虑土工格栅影响区建模的分层方法可以有效地用于土工格栅稳定路面系统的力学分析。在柔性路面机械分析和建模中，两种土工格栅类型提供的局部刚度增强被分配给土工格栅稳定骨料基层的模量剖面。建模结果证明了土工格栅基础稳定性对两种土工格栅类型计算的路面弹性响应的影响。适当考虑土工格栅影响区建模的分层方法可以有效地用于土工格栅稳定路面系统的力学分析。在柔性路面机械分析和建模中，两种土工格栅类型提供的局部刚度增强被分配给土工格栅稳定骨料基层的模量剖面。建模结果证明了土工格栅基础稳定性对两种土工格栅类型计算的路面弹性响应的影响。适当考虑土工格栅影响区建模的分层方法可以有效地用于土工格栅稳定路面系统的力学分析。