Shakedown analysis of cyclic plastic deformation characteristics of unbound granular materials under moving wheel loads
Shakedown analysis of cyclic plastic deformation characteristics of unbound granular materials under moving wheel loads
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DOI：
10.1016/j.conbuildmat.2018.02.064
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发表时间：
2018-04
影响因子：
7.4
通讯作者：
Yuanjie Xiao;Keyang Zheng;Liuxin Chen;Jian-feng Mao
中科院分区：
文献类型：
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作者：
Yuanjie Xiao;Keyang Zheng;Liuxin Chen;Jian-feng Mao
非粘结颗粒材料的循环塑性应变行为具有显著的应力路径依赖性。利用自制的应力路径加载三轴仪，对两种典型的UGM进行了轴向应力和径向应力同时变化的重复加载三轴（RLT）试验。研究和量化了车轮通过引起的实际地应力路径对未结合粒料基层和底基层材料循环塑性应变行为的影响。对实验结果的分析表明，两种UGM在不同应力路径载荷作用下的累积塑性应变响应可以用安定方法来描述。累积永久应变量，永久应变率，和回弹应变被用来分类的塑性变形累积模式下移动车轮载荷的试验材料。最后，路面分析和设计实践的研究成果的意义，突出了UGM的永久变形阻力和他们的适用性，用于抗车辙和稳定的路面基层的评估。
Cyclic plastic strain behavior of unbound granular materials (UGMs) exhibits significant stress path dependency. Using a customized triaxial apparatus capable of applying stress path loading, a series of laboratory repeated load triaxial (RLT) tests were conducted on two typical UGMs by varying simultaneously the axial stress and the radial stress. Effects of realistic in-situ stress paths due to a passing wheel on cyclic plastic strain behavior of unbound granular base and subbase materials were investigated and quantified. The analyses of experimental results revealed that the accumulated plastic strain responses of both UGMs subjected to different stress path loadings can be described by the shakedown approach. The amount of accumulated permanent strain, permanent strain rate, and resilient strain were used to classify the plastic deformation accumulation patterns of tested materials under moving wheel loads. Finally, the significance of the research findings on pavement analysis and design practices was highlighted to evaluate permanent deformation resistance of UGMs and their suitability for use in rut resistant and stable pavement foundation layers.