振动荷载作用下重载铁路路基粗颗粒土填料临界动应力试验研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (16) : 25-30.

论文

冷伍明，刘文劼，周文权

作者信息 +

Testing research on critical cyclical stress of coarse-grained soil filling in heavy haul railway subgrade

LENG Wu-ming，LIU Wen-ji，ZHOU Wen-quan

Author information +

文章历史 +

摘要

由于重载铁路路基表层为粗颗粒土填料，直接承受轨道结构传递的列车动载往复作用，其临界动应力会影响累积变形，利用自行开发的动三轴试验系统进行不同围压、动应力幅值、含水率条件下粗颗粒土填料的持续振动试验，获得粗颗粒土累积动应变与振次关系曲线，并分析围压、含水率对累积动应变增长影响；在获得不同含水率条件下粗颗粒土的临界动应力比线基础上提出计算临界动应力经验公式。

Abstract

The surface layerof heavy haul railway subgrade is mainly composed of coarse-grained soil (CGS).The accumulative deformation characteristic of CGS is a very important issue because CGS directly supports the cyclical train loading from upper structure. Previous researches revealed that critical cyclical stress ratio (CCSR) is a significant factorof accumulative deformation characteristic. In this paper, by using the self-developed dynamictriaxial testing system,some sustained vibration tests werecarried out on CGS with different confiningpressures,dynamic stressamplitudes and water contents .The tests obtainsome curves of accumulativedynamicstrain versus vibration times. The influences of confining pressure and water content on accumulativedynamic strain increase arediscussed. Furthermore, the CCSR lines of CGS with different water contents are acquired. Finally, anexperience formula for calculating critical cyclical stress is put forward.

导出引用

冷伍明，刘文劼，周文权 . 振动荷载作用下重载铁路路基粗颗粒土填料临界动应力试验研究[J]. 振动与冲击, 2015, 34(16): 25-30

LENG Wu-ming，LIU Wen-ji，ZHOU Wen-quan. Testing research on critical cyclical stress of coarse-grained soil filling in heavy haul railway subgrade[J]. Journal of Vibration and Shock, 2015, 34(16): 25-30

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