Local Stiffness Quantification of Geogrid-Reinforced Aggregate Base Materials Using Shear Waves under Repeated Loading

Yong-Hoon Byun, E. Tutumluer
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Abstract

Local Stiffness Quantification of Geogrid-Reinforced Aggregate Base Materials using Shear Waves under Repeated Loading Yong-Hoon Byun and Erol Tutumluer, University of Illinois at Urbana-Champaign Geogrid-aggregate interlock provides enhanced local stiffness in the vicinity of the installed geogrid and is a responsible mechanism for the improved performance of geogrid base reinforced pavements. The objective of this study was to establish innovative approaches to quantify the local stiffness increase of geogrid-stabilized aggregate samples. Two pairs of bender elements were installed at two different heights of cylindrical specimens in a repeated load triaxial testing device. Resilient modulus testing was conducted on both geogrid reinforced and unreinforced specimens. Through the use of bender elements, the shear waves were measured during the resilient modulus tests. Experimental results show that the shear moduli estimated from the shear wave velocities increase with bulk stress, regardless of geogrid reinforcement. The shear modulus estimated in the vicinity of the geogrid was always greater than that estimated farther away from the geogrid. According to the preliminary tests conducted so far, geogrid-aggregate interlock related local stiffness increase in unbound aggregate base layers can be effectively quantified by using shear waves.
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重复荷载作用下土工格栅-骨料基层材料局部刚度的剪切波量化
Yong-Hoon byyun和Erol Tutumluer,伊利诺伊大学厄巴纳- champaign分校的土工格栅-骨料联锁提供了安装土工格栅附近的局部刚度增强,是改善土工格栅基础加筋路面性能的负责任的机制。本研究的目的是建立创新的方法来量化土工格栅稳定骨料样品的局部刚度增加。在重复载荷三轴试验装置中,在圆柱形试样的两个不同高度安装了两对弯曲单元。对加筋土工格栅和未加筋土工格栅试件进行了弹性模量测试。利用弯折单元,对弹性模量试验过程中的剪切波进行了测量。实验结果表明,无论土工格栅加筋与否,由剪切波速估算的剪切模量都随体应力的增加而增加。在土工格栅附近估计的剪切模量总是大于远离土工格栅的估计。根据目前进行的初步试验,利用剪切波可以有效地量化非粘结骨料基层土工格栅-骨料互锁相关的局部刚度增加。
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