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首页> 外文期刊>Geotechnique >Soil water retention curves representing two tropical clay soils from Sudan
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Soil water retention curves representing two tropical clay soils from Sudan

机译：代表苏丹的两种热带黏土的土壤保水曲线

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摘要

Soil water retention curves (SWRCs) form an essential component of frameworks coupling the hydromechanical behaviour of unsaturated soils. The curves describe how suction changes with variables such as degree of saturation. SWRCs can be determined from incrementally drying initially saturated reconstituted samples to a final residual state, thus developing the primary drying curve (PDC). The primary wetting curve (PWC) is established from subsequent incremental wetting and is hysteretic compared with the PDC. SWRCs for two reconstituted, high-plasticity, tropical clays from Sudan have been determined using the filter paper technique, for which the maximum measurable suction is 30 MPa. At this suction the degree of saturation for both soils was greater than 40% and did not reduce much further on full drying under ambient laboratory conditions. Thus the primary SWRCs did not develop into the usual sigmoidal shape expected. The development of SWRCs under various subsequent cycles of wetting and drying are presented and discussed along with details concerning volumetric changes and cracking during drying. In order to investigate the uniqueness of the PDC and PWC and the effect of initial void ratio, SWRCs were determined for samples formed by dynamic and static compaction under different applied energy levels and also for intact samples. These were found to be located to the left of the PDC and often the PWC too.
机译：土壤保水曲线（SWRCs）是耦合非饱和土壤水力学行为的框架的重要组成部分。曲线描述了吸力如何随变量（例如饱和度）变化。可以通过将最初饱和的重组样品逐步干燥至最终残留状态，从而得出初级干燥曲线（PDC）来确定SWRC。主润湿曲线（PWC）由随后的增量润湿建立，并且与PDC相比具有滞后性。已经使用滤纸技术确定了来自苏丹的两种再生的高塑性热带粘土的SWRC，最大可测量吸力为30 MPa。在这种吸力下，两种土壤的饱和度均大于40％，并且在环境实验室条件下完全干燥后不会进一步降低。因此，初级SWRC并没有发展成预期的通常的S形。介绍并讨论了在各种后续润湿和干燥循环下SWRC的发展以及有关干燥过程中体积变化和开裂的细节。为了研究PDC和PWC的独特性以及初始空隙率的影响，确定了在不同施加能级下通过动态和静态压实形成的样品以及完整样品的SWRC。发现它们位于PDC的左侧，通常也位于PWC的左侧。

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  • 来源
    《Geotechnique》 |2016年第1期|71-84|共14页
  • 作者

    Al Haj K. M. A.; Standing J. R.;

  • 作者单位

    Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London, England|Univ Khartoum, Dept Civil Engn, Khartoum, Sudan;

    Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London, England;

  • 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

    expansive soils; laboratory tests; partial saturation; suction;

    机译：膨胀土;实验室测试;部分饱和;吸力;

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