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结构性软黏土的一维弹黏塑性模型

柯文汇, 陈健, 盛谦

柯文汇, 陈健, 盛谦. 结构性软黏土的一维弹黏塑性模型[J]. 岩土工程学报, 2016, 38(3): 494-503. DOI: 10.11779/CJGE201603013
引用本文: 柯文汇, 陈健, 盛谦. 结构性软黏土的一维弹黏塑性模型[J]. 岩土工程学报, 2016, 38(3): 494-503. DOI: 10.11779/CJGE201603013
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KE Wen-hui, CHEN Jian, SHENG Qian. One-dimensional elasto-viscoplastic model for structured soft clays[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(3): 494-503. DOI: 10.11779/CJGE201603013
Citation: KE Wen-hui, CHEN Jian, SHENG Qian. One-dimensional elasto-viscoplastic model for structured soft clays[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(3): 494-503. DOI: 10.11779/CJGE201603013
shu

结构性软黏土的一维弹黏塑性模型  English Version

  • 1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北 武汉 430071;
    2. 武汉市市政建设集团有限公司,湖北 武汉 430023

基金项目: 中国科学院重点部署项目,百人计划项目(KZZD-EW-TZ-12); 国家重点基础研究发展计划("973"计划)项目(2015CB057905); 中国科学院科技服务网络计划(STS)(KFJ-EW-STS-122)
详细信息
    作者简介:

    柯文汇(1987- ),男,湖北黄石人,博士研究生,主要从事软土工程特性及软土地下工程变形机理方面的研究.E-mail: kewenhui1989@126.com.

    通讯作者:

    陈健

  • 中图分类号: TU447

One-dimensional elasto-viscoplastic model for structured soft clays

  • 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
    2. Wuhan Municipal Construction Group Co., Ltd., Wuhan 430023, China

摘要

    摘要
  • 摘要: 为了研究结构性软黏土一维压缩变形的时效特征和结构破坏特征的耦合效应,首先,基于Bjerrum的等时间线体系,提出等黏塑性应变率线概念,建立非结构性软黏土的新型一维弹黏塑性模型;然后,在大量试验结果的基础上,揭示了一维压缩过程中压缩指数随孔隙比的变化规律,并提出了土体结构渐进破坏的新型描述模式;仿照特征体积,定义了"本征体积"和"本征应变"的概念,得到了结构性软黏土的"本征压缩定律",并推导了结构性软黏土的蠕变方程,构建了结构性软黏土的一维弹黏塑性模型.最后,阐述了模型参数的确定方法,所有参数均可通过试验直接确定,并用本文模型对宁波天然软黏土的常规压缩试验和长期蠕变试验,Berthierville clay,Ariake clay的一维等应变率压缩试验进行模拟,验证了该模型的有效性.研究结果表明,该模型能很好地模拟结构性软黏土一维压缩变形的时间效应和结构破坏效应,为建立结构性软黏土三维时效本构模型奠定了基础.
    Abstract: The purpose of this study is to present the development of a one-dimensional elasto-viscoplastic (1DEVP) constitutive model to describe the destruction effects on the time-dependent behavior of structured soft clays. Firstly, the new concept of viscoplastic strain rate lines is proposed based on the Bjerrum's concept of time lines, and the 1DEVP model for unstructured soft clays is established. Secondly, with the variation law of compression index with void ratio with one-dimensional compression being revealed, a new description for the progressive destruction during 1D loading is proposed for the structured soft clays. Thirdly, based on the definitions of "intrinsic volume" and "intrinsic strain", the intrinsic compression law for soft clays is obtained consequently. And after the derivation of creep function for the structured soft clays, 1DEVP model considering destruction effects is established, with all model parameters being calibrated in a straightforward way. Furthermore, the newly developed model is used to simulate the conventional oedometer tests and long-term creep oedometer tests on Ningbo natural clays as well as the CRS oedometer tests on Berthierville clays and Ariake clays. The comparisons between the simulated and experimental results show that the newly proposed 1DEVP model can reasonably describe the coupled effects of the time dependence and the bond degradation of soft sensitive clays. Although the model is proposed for 1D analysis, it is helpful for providing the theoretical basis for establishing 3D elasto-viscoplastic models for the structured soft clays.
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    • 参考文献(30)
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  • 收稿日期:  2015-01-08
  • 发布日期:  2016-03-24

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