粗粒土路基循环荷载试验及累积变形模型研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (16) : 128-133.

论文

龙尧，张家生，丁建源，王维波

作者信息 +

The cyclic load experiments and accumulated deformation model for coarse-grained soil filling

LONG Yao, ZHANG Jia-sheng, DING Jian-yuan, WANG Wei-bo

Author information +

文章历史 +

摘要

为了探讨粗粒土路基在往复列车荷载作用下产生的累积变形和动力特性，开展了粗粒土的室内动三轴试验，分析了不同循环应力比、不同围压对粗粒土路基累积变形的影响。根据动三轴试验结果，提出了考虑围压和循环应力比影响的粗粒土路基累积变形模型。研究结果表明：循环应力比为0.3时是加载次数-累积动应变曲线由稳定型向破坏型演化的起点。随着循环应力比的增大，软化指数不断增大；当循环应力比小于0.3时，软化指数随着围压的增大而减小，当循环应力比大于0.3时，软化指数随着围压的增大而增大。累积变形模型反映循环应力比和围压对累积动应变的影响，能较好的预测累积动应变的发展趋势，且模型参数有明确的物理意义，希望能为粗粒土路基的设计和养护提供参考。

Abstract

In order to research accumulated deformation and dynamic properties of coarse-grained soil foundation under cyclical train loading, the dynamic triaxial test was conducted, and analyzed the effects of cycling stress ratio (CSR) and confining pressure on accumulated deformation behavior. Based on the results of the dynamic triaxial tests, an accumulated deformation model which considers the impacts of confining stress and CSR was developed. The results show that the loading times-accumulated dynamic strain curve starts to transfer stable type to damage type when CSR is 0.3. With increasing of CSR, softening index is increasing. When CSR is smaller than 0.3, the softening index is decreasing with the increasing of confining press; but when CSR is larger than 0.3, the softening index is increasing with the increasing of confining press. The accumulated deformation model can reflect the effects of CSR and confining press on accumulated deformation, and it can predict the accumulated deformation development tendency. The model parameters have explicit physical meaning. Hope for the design and maintenance of coarse grained foundation provide the reference.

导出引用

龙尧，张家生，丁建源，王维波. 粗粒土路基循环荷载试验及累积变形模型研究[J]. 振动与冲击, 2017, 36(16): 128-133

LONG Yao, ZHANG Jia-sheng, DING Jian-yuan, WANG Wei-bo. The cyclic load experiments and accumulated deformation model for coarse-grained soil filling[J]. Journal of Vibration and Shock, 2017, 36(16): 128-133

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