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首页> 外文期刊>Geotechnique >Modelling the static liquefaction of sand with low-plasticity fines
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Modelling the static liquefaction of sand with low-plasticity fines

机译：用低塑性细粒模拟沙子的静态液化

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摘要

There have been significant advances in understanding of the effect of fines content, f_c, on the mechanical response of sand with fines. The concepts of equivalent granular void ratio, e~*, and equivalent granular state parameter, φ~*, which were developed for sands with fines, can be used in lieu of e and φ to provide a unifying framework for characterising the undrained response of sands with low-plasticity fines, irrespective of f_c. In addition, a recently developed constitutive model was able to capture the influence of both density, using e, and stress states on the stress-strain responses of clean sand under drained or undrained shearing with one set of parameters. This was achieved by rendering dilatancy and peak-failure stress ratio functions of φ. The present work combines these two powerful unifying propositions, and by merely substituting e~* and φ~* for e and φ into the equations of the aforementioned model for clean sands, obtains a constitutive model for sand with fines that can capture the influence of f_c, irrespective of density and stress states. The model-specific parameters were obtained from a few drained tests at a single fines content. Undrained responses for a range of f_c and densities, with particular emphasis on liquefaction behaviour, were then predicted. For flow behaviour, the predictions agree well with experimental observations over a wide spectrum of initial conditions. The quality of the predictions reduces for limited flow behaviour. For non-flow behaviour, significant deviations were observed.
机译：在理解细料含量f_c对细料砂的机械响应的影响方面取得了重大进展。为细粉砂开发的等效颗粒孔隙率e〜*和等效颗粒状态参数φ〜*的概念可以代替e和φ使用，以提供一个统一的框架来表征砂岩的不排水响应。与f_c无关的低塑性细砂。另外，最近开发的本构模型能够使用一组参数来捕获密度（使用e）和应力状态对干净沙子在排水或不排水剪切作用下的应力应变响应的影响。这是通过呈现φ的剪胀和峰-断裂应力比函数来实现的。本工作结合了这两个强大的统一命题，仅通过将e和φ的e〜*和φ〜*代入上述清洁砂模型的方程式中，即可得到具有细砂的本构模型，该砂可以捕捉到细砂的影响。 f_c，与密度和应力状态无关。特定于模型的参数是从几次排干试验中获得的，其粉尘含量均为单一。然后预测了一系列f_c和密度的不排水反应，尤其着重液化行为。对于流动行为，这些预测与在广泛的初始条件下的实验观察非常吻合。对于有限的流量行为，预测的质量降低了。对于非流动行为，观察到明显的偏差。

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  • 来源
    《Geotechnique》 |2014年第11期|881-894|共14页
  • 作者

    M. M. RAHMAN; S.-C. R. LO; Y. F. DAFALIAS;

  • 作者单位

    School of Natural and Built Environments & Barbary Hardy Institute, University of South Australia, Mawson Lakes, SA, Australia;

    University of New South Wales, Canberra, Australia;

    Department of Civil and Environmental Engineering, University of California, Davis, CA, USA Department of Mechanics, National Technical University of Athens, Hellas;

  • 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

    constitutive relations; liquefaction; plasticity; sands; silts;

    机译：本构关系液化;可塑性;沙淤泥;

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