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首页> 外文期刊>International journal of geomechanics >Investigating Strength and Deformation Characteristics of Heavy-Haul Railway Embankment Materials Using Large-Scale Undrained Cyclic Triaxial Tests
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Investigating Strength and Deformation Characteristics of Heavy-Haul Railway Embankment Materials Using Large-Scale Undrained Cyclic Triaxial Tests

机译：使用大型不排水循环三轴试验研究重型铁路路堤材料的强度和变形特性

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摘要

Heavy-haul railway embankments in China are generally constructed with coarse-grained granular (CGS) materials. The accumulation of permanent deformations in CGS materials remains a significant concern and technical challenge because the CGS layer sustains a considerable portion of the intense train-loading transferred from overlying structures. Previous research studies demonstrated that the critical cyclic stress (CCS) level significantly affects the accumulative permanent (or plastic) deformation. This paper presents the results from a series of repeated-load, undrained, permanent deformation triaxial tests conducted in the laboratory using a customized large-scale triaxial apparatus. CGS specimens prepared with different moisture contents were subjected to different combinations of confining and deviator stress levels. The accumulation of permanent axial strain as a function of the number of load cycles was recorded for each specimen during the tests. The influences of moisture content, confining pressure, and deviator stress on modulus and permanent axial strain accumulation characteristics were analyzed. Empirical formulas for calculating the elastic modulus and accumulated permanent axial strain are proposed. The findings in this study could provide guidance for designing similar heavy-haul railway embankments. (C) 2017 American Society of Civil Engineers.
机译：中国的重载铁路路堤通常使用粗颗粒（CGS）材料建造。 CGS材料中永久变形的累积仍然是一个重大问题和技术挑战，因为CGS层承受了从上覆结构传递来的大量列车荷载。先前的研究表明，临界循环应力（CCS）水平会显着影响累积的永久（或塑性）变形。本文介绍了使用定制的大型三轴设备在实验室中进行的一系列重复载荷，不排水，永久变形三轴测试的结果。用不同水分含量制备的CGS标本要经受不同的限制应力和偏应力水平组合。在测试过程中，记录每个样品的永久轴向应变累积与载荷循环次数的关系。分析了水分，围压和偏应力对模量和永久轴向应变累积特性的影响。提出了计算弹性模量和累积永久轴向应变的经验公式。这项研究的结果可以为设计类似的重型铁路路堤提供指导。 （C）2017年美国土木工程师学会。

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  • 来源
    《International journal of geomechanics》 |2017年第9期|04017074.1-04017074.13|共13页
  • 作者

    Leng Wuming; Xiao Yuanjie; Nie Rusong; Zhou Wenquan; Liu Wenjie;

  • 作者单位

    Cent S Univ, Sch Civil Engn, Natl Engn Lab High Speed Railway Construct, Geotech Engn, Changsha 410075, Hunan, Peoples R China;

    Cent S Univ, Sch Civil Engn, Natl Engn Lab High Speed Railway Construct, Geotech Engn, Changsha 410075, Hunan, Peoples R China|Cent S Univ, Minist Educ, Key Lab Heavy Haul Railway Engn Struct, 22 South Shaoshan Rd, Changsha 410075, Hunan, Peoples R China;

    Cent S Univ, Sch Civil Engn, Natl Engn Lab High Speed Railway Construct, Geotech Engn, Changsha 410075, Hunan, Peoples R China;

    Cent S Univ, Sch Civil Engn, Natl Engn Lab High Speed Railway Construct, Geotech Engn, Changsha 410075, Hunan, Peoples R China;

    Cent S Univ, Sch Civil Engn, Natl Engn Lab High Speed Railway Construct, Changsha 410075, Hunan, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Heavy-haul railway embankment; Coarse-grained granular materials; Repeated-load undrained triaxial tests; Permanent axial strain; Critical cyclic stress;

    机译：重型铁路路基;粗粒料;反复荷载不排水三轴试验;永久轴向应变;临界循环应力;

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