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首页> 外文会议>Geotechnical frontiers >Local Stiffness Quantification of Geogrid-Reinforced Aggregate Base Materials Using Shear Waves under Repeated Loading
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Local Stiffness Quantification of Geogrid-Reinforced Aggregate Base Materials Using Shear Waves under Repeated Loading

机译：反复荷载作用下土工格栅加筋骨料基体的局部刚度定量

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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.
机译：土工格栅与骨料的联锁可在已安装的土工格栅附近提供增强的局部刚度，并且是改善土工格栅基础加固路面性能的负责任机制。这项研究的目的是建立创新的方法来量化土工格栅稳定的骨料样品的局部刚度增加。在重复载荷三轴测试设备中，将两对弯曲器元件安装在两个不同高度的圆柱试样上。弹性模量测试是在土工格栅加固和未加固的标本上进行的。通过使用弯曲元件，在弹性模量测试期间测量了剪切波。实验结果表明，不管土工格栅如何加固，根据剪切波速度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始终大于远离土工格栅估计的剪切模量。根据到目前为止进行的初步测试，可以通过使用剪切波来有效地量化未结合的骨料基层中土工格栅与骨料联锁相关的局部刚度增加。

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