Effect of Reinforcement on Resilient and Permanent Deformations of Base Course Material
Effect of Reinforcement on Resilient and Permanent Deformations of Base Course Material
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DOI：
10.3141/2004-13
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发表时间：
2007-01
影响因子：
1.7
通讯作者：
M. Abu-Farsakh;Munir D. Nazzal;L. Mohammad
中科院分区：
文献类型：
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作者：
M. Abu-Farsakh;Munir D. Nazzal;L. Mohammad
交通荷载作用下基层材料的变形响应表现为弹性（可恢复）变形和永久（不可恢复）变形。一系列重复加载三轴试验进行了无筋和土工格栅加筋碎石石灰岩样品的土工格栅刚度，位置，层数，和碎石石灰岩含水量和应力状态的影响，这些样品的弹性和永久变形在不同数量的负载循环。使用了三种类型的土工格栅。对于每一种土工格栅类型，三个加固安排进行了调查。通过对在三种不同含水量（最佳含水量和最佳含水量±2.5%）下制备的样品进行重复载荷三轴试验，研究了破碎石灰石含水量的影响。对收集的数据进行统计分析。结果表明，土工格栅夹杂物内粉碎石灰岩样品显着减少永久变形，但没有表现出明显的影响，对弹性变形。土工格栅刚度和布置方式对改善效果有显著影响。然而，土工格栅刚度的效果被发现是小于土工格栅的安排的效果。对于小于塑性安定应力极限的应力水平，土工格栅在初级后压实阶段对永久变形抗力的贡献最小;然而，它在次级阶段显著增加了永久变形抗力。此外，土工格栅加固被发现有一个小的永久变形阻力机制时，施加的应力水平大于塑性安定应力极限的影响。结果表明，石灰石材料的含水量的变化改变了材料的应力状态，这显着影响土工格栅的改善。
Deformational response of base course material under traffic loading is characterized by resilient (recoverable) and permanent (irrecoverable) deformation. A series of repeated load triaxial tests was conducted on unreinforced and geogrid-reinforced crushed limestone samples to evaluate the effects of the geogrid stiffness, location, number of layers, and crushed limestone moisture content and state of stress on the resilient and permanent deformations of these samples at different number of load cycles. Three types of geogrids were used. For each geogrid type, three reinforcement arrangements were investigated. The effect of the moisture content of the crushed limestone was investigated by conducting repeated load triaxial tests on samples prepared at three different moisture contents: optimum moisture content and ±2.5% of the optimum moisture content. Statistical analyses were conducted on the collected data. Results indicated that the geogrid inclusion within crushed limestone samples significantly reduced permanent deformations but did not show appreciable effect on resilient deformations. Improvement was significantly affected by the geogrid stiffness and arrangement. However, the effect of the geogrid stiffness was found to be smaller than the effect of the geogrid arrangement. For stress levels less than the plastic shakedown stress limit, the geogrid had a minimum contribution to the permanent deformation resistance during primary postcompaction stage; however, it significantly increased the permanent deformation resistance during the secondary stage. In addition, the geogrid reinforcement was found to have a small effect on the permanent deformation resistance mechanisms when the imposed stress level was greater than the plastic shakedown stress limit. Results illustrate that change in the moisture content of the crushed limestone material alters the material state of stress and this significantly affects the geogrid improvement.