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首页> 外文期刊>Environmental earth sciences >Preliminary research on the theory and application of unsaturated Red-layers embankment settlement based on rheology and consolidation theory
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Preliminary research on the theory and application of unsaturated Red-layers embankment settlement based on rheology and consolidation theory

机译：基于流变和固结理论的非饱和红层路堤沉降理论与应用初探

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摘要

The settlement of an embankment body is always a significant technological issue in highway and railway construction. The embankment body is usually constructed using unsaturated soil, whose deformation consists of three parts, instantaneous deformation, primary-consolidation deformation and secondary-consolidation deformation. The primary consolidation and the secondary compression deformations are not two separate processes, but they influence each other, that are the deformation of the embankment body is the coupling-effect result of unsaturated-rheology and consolidation. Based on the results of uniaxial compression creep test of crushed Red-layers mudstone soils and the principle of the single stress state variable in unsaturated soils, the theory of unsaturated embankment settlement of Red-layers is put forward. Physical centrifugal tests and numerical simulation of centrifugal loading process are adapted not only to study the relationships of the settlement of the embankment body filled with different compaction coefficients versus embankment filling height, as well as the settlement after construction versus time, but also to predict the settlement after construction. Based on these studies, a project case, the settlement characteristics of a section of the railway line for passenger traffic from Chongqing to Suining have been studied by numerical simulation considering actual filling process. These show that the physical centrifugal tests and site monitoring data largely coincide with the corresponding numerical simulation results, showing the high validation of the proposed coupling-theory.
机译：路堤主体的沉降在公路和铁路建设中始终是一个重要的技术问题。路堤主体通常采用非饱和土构造，其变形包括瞬时变形，一次固结变形和二次固结变形三个部分。一次固结和二次压缩变形不是两个独立的过程，而是相互影响的，即路堤体的变形是不饱和流变与固结的耦合效应结果。基于破碎红层泥岩土的单轴压缩蠕变试验结果以及非饱和土中的单应力状态变量原理，提出了红层非饱和路堤沉降理论。不仅适用于研究不同压实系数的路堤的沉降与路堤的填充高度之间的关系，还考虑了施工后随时间的沉降，并进行了物理离心试验和离心加载过程的数值模拟。施工后沉降。在这些研究的基础上，通过考虑实际填充过程的数值模拟，研究了一个项目案例，即重庆至遂宁客运专线的沉降特性。这些表明，物理离心测试和现场监测数据与相应的数值模拟结果基本吻合，表明了所提出耦合理论的高度有效性。

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  • 来源
    《Environmental earth sciences》 |2016年第6期|503.1-503.21|共21页
  • 作者

    Liu Junxin; Liu Wei; Liu Peng; Yang Chunhe; Xie Qiang; Liu Yutian;

  • 作者单位

    Southwest Univ Sci & Technol, Sch Civil Engn & Architecture, Mianyang 621010, Sichuan, Peoples R China|Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;

    Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;

    Southwest Univ Sci & Technol, Sch Civil Engn & Architecture, Mianyang 621010, Sichuan, Peoples R China;

    Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;

    Southwest Jiaotong Univ, Sch Geosci & Environm Engn, Chengdu 610031, Peoples R China;

    Southwest Univ Sci & Technol, Sch Civil Engn & Architecture, Mianyang 621010, Sichuan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Creep; Unsaturated soils; Single stress state variable; Settlement; Site monitoring;

    机译：蠕变;不饱和土壤;单应力状态变量;沉降;场地监测;

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