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Experimental study on sand and gravel columns in clay

机译：粘土砂石柱的试验研究

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摘要

Theoretical and experimental studies have shown that stone columns can be used for accelerating the consolidation rate of soft soils by providing a drainage path, reducing foundation settlements, improving the bearing capacity of the soil, and limiting the risk of liquefaction due to seismic activity. This paper studies the influence of the main controlling parameters in the design of stone columns through a series of laboratory experiments. The effects of (a) the drainage conditions, (b) the grain size of the stone column material, (c) the confining pressure of the soil, and (d) the rate of deformation are investigated. Triaxial compression tests are performed on composite soil specimens of soft kaolin clay, reconstituted from a slurry with a central compacted reinforcement column. Two cases of reinforcement material are studied: sand and gravel. The behaviour of the reinforced soil compared with that of the unreinforced soil under the same loading and drainage conditions is analysed. The experimental results show the beneficial effect of this ground improvement technique on the strength characteristics of the foundation soil, even with a relatively low replacement factor compared with that used in practice. As the confining pressure increases, the improvement in the specimen with the sand column is more pronounced.
机译：理论和实验研究表明，石柱可通过提供排水路径，减少地基沉降，提高土壤的承载力并限制地震活动引起的液化风险，来加快软土的固结速度。本文通过一系列的室内实验研究了主要控制参数对石柱设计的影响。研究了（a）排水条件，（b）石柱材料的粒径，（c）土壤的围压以及（d）变形率的影响。对软高岭土的复合土壤标本进行三轴压缩试验，该软土由带有中心压实增强柱的浆液复原而成。研究了两种情况的增强材料：沙子和砾石。分析了相同荷载和排水条件下加筋土与非加筋土的性能。实验结果表明，即使与实际使用的置换因子相比，这种地面改良技术对基础土壤的强度特性也具有有益的效果。随着围压的增加，带有砂柱的试样的改善更加明显。

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  • 来源
    《Proceedings of the Institutuion Civil Engineers》 |2008年第gi4期|189-198|共10页
  • 作者

    P. Andreou; W. Frikha; R. Frank; J. Canou; V. Papadopoulos; J.-C. Dupla;

  • 作者单位

    School of Civil Engineering,National Technical University of Athens,Greece;

    Flesearch Team,Geotechmcal Engineering,National Engineering School of Tunis. Tunisia;

    Unversite Pans-Est, Institut Navier, ENPC-CERMES,Pans, France;

    Universite Pans-Est, Institut Navier, ENPC-CERMES,Pans, France;

    School of Civil Engineering,National Technical University of Athens,Greece;

    Universite Pans-Est. Institut Navier, ENPC-CERMES,Pans, France;

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  • 正文语种 eng
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  • 关键词

    geotechnical engineering;

    机译：岩土工程;

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