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分级加载下铁路路基粗粒土 动力特性研究

LI Yangbo,ZHANG Jiasheng,ZHU Zhihui,WANG Xuan,SHI Xiong

Journal of Railway Science and Engineering（2019）

Cited 1|Views8
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Abstract
利用大型动三轴试验仪对铁路路基粗粒土填料开展分级加载的循环三轴试验,分析围压、加载频率对粗粒土动应力-动应变关系、动弹模以及阻尼比等动力特性的影响.试验结果表明:随着围压或频率的增加,土体的动强度、动弹性模量和阻尼比均增大;动应变较小时频率或围压对阻尼比的影响较小,动应变较大时频率或围压对阻尼比影响较大.在试验基础上建立基于Hardin-Drnevich骨架曲线和符合广义Masing准则的粗粒土非线性动本构模型,并在ABAQUS中UMAT二次开发平台编制相应的子程序.通过与试验结果比较,验证了粗粒土非线性动本构模型的正确性.
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