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首页> 外文期刊>Construction and Building Materials >Creep behaviors and constitutive model for high density polyethylene geogrid and its application to reinforced soil retaining wall on soft soil foundation
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Creep behaviors and constitutive model for high density polyethylene geogrid and its application to reinforced soil retaining wall on soft soil foundation

机译：高密度聚乙烯土工格栅蠕变行为与本构模型及其在软土地基加筋土挡墙上的应用

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摘要

The reinforced soil retaining wall has been applied extensively with its numerous advantages. However, the performance of geogrids reinforced soil retaining wall was affected by creep behavior of geogrids and soft soil foundation as well as stress relaxation of geogrids. In this paper, the creep behavior and stress relaxation of high density polyethylene geogrids have been investigated in a laboratory. Four different sustained load levels of 20%, 40%, 50% and 60% of ultimate tensile strength were employed as load levels for creep tests. A constitutive Model, which was capable of simulating creep behaviors and stress relaxation of geogrids, was established based on experimental data and verified. Numerical modeling using finite element method has also been used to assess the impact of creep behavior and stress relaxation of geogrids on the long-term performance of reinforced soil retaining wall on the deep soft soil foundation. The results show that the constitutive model for creep behavior and stress relaxation of geogrids was in good qualitative agreement with experimental data under different load levels. To ensure the stability of the retaining wall, the working stress of geogrids should be less than 40% of ultimate tensile strength, and the high strength geogrids should be adopted in the middle of the wall or the spacing of geogrid reinforced layers should be reduced. The deep soft soil foundation which is treated by piles can ignore the creep behavior of soft soil. (C) 2016 Elsevier Ltd. All rights reserved.
机译：加筋土挡土墙以其众多优点而被广泛应用。然而，土工格栅加筋土挡墙的性能受土工格栅的蠕变行为和软土地基以及土工格栅的应力松弛的影响。本文在实验室中研究了高密度聚乙烯土工格栅的蠕变行为和应力松弛。极限抗拉强度的20％，40％，50％和60％四种不同的持续载荷水平被用作蠕变测试的载荷水平。根据实验数据建立了能够模拟土工格栅蠕变行为和应力松弛的本构模型，并进行了验证。还使用有限元方法进行了数值建模，以评估土工格栅的蠕变行为和应力松弛对深层软土地基上加筋土挡土墙长期性能的影响。结果表明，土工格栅蠕变行为和应力松弛本构模型在不同载荷水平下与实验数据吻合良好。为了确保挡土墙的稳定性，土工格栅的工作应力应小于极限抗拉强度的40％，并且在墙的中间应采用高强度土工格栅，或者应减小土工格栅加固层的间距。用桩处理的深层软土基础可以忽略软土的蠕变行为。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2016年第1期|763-771|共9页
  • 作者

    Zou Chao; Wang Yimin; Lin Junyong; Chen Yekai;

  • 作者单位

    S China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510541, Guangdong, Peoples R China;

    S China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510541, Guangdong, Peoples R China;

    S China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510541, Guangdong, Peoples R China;

    S China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510541, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geogrid; Creep; Soft soil; Reinforced retaining wall; Constitutive model;

    机译：土工格栅;蠕变;软土;加筋挡土墙;本构模型;

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