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Failure mechanism of geosynthetic-encased stone columns in soft soils under embankment

机译:路堤下软土中土工包裹石柱的破坏机理

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摘要

The reaction of geosynthetic-encased stone columns (GECs) in soft soils under embankment loading was modeled with an indoor physical model test and numerical models using three dimensional and two dimensional finite element methods. The experimental and three dimensional numerical modeling results showed that the failure of the GECs is caused by the bending of the columns rather than shear. Three dimensional finite element analysis showed that the distribution of unbalanced lateral loading acting on the columns is symmetric about a 'hinge point' above the plastic hinge, rather than triangle or uniform distribution. An equivalent shear resistance model of the GECs is proposed based on the distribution of the unbalanced lateral loadings on the wall. The stability of the embankment was analyzed in two dimensional finite element method by transforming the columns into equivalent soil walls using equivalent bending resistance and equivalent shear resistance methods. It was found that results from equivalent bending resistance method is closer to the estimations from the three dimensional analysis, which agrees with the bending failure mechanism of the GECs. It is suggested that one more row of such columns may be required to provide higher lateral resistance in the soils in front of the toe to improve the stability of the embankment. (C) 2015 Elsevier Ltd. All rights reserved.
机译:采用室内物理模型试验和数值模型,利用三维和二维有限元方法,对路堤荷载下软土中土工包裹石柱(GEC)的反应进行了建模。实验和三维数值模拟结果表明,GEC的失效是由柱的弯曲而不是剪切引起的。三维有限元分析表明,作用在圆柱上的不平衡侧向荷载的分布关于塑料铰链上方的“铰链点”对称,而不是三角形或均匀分布。根据墙体不平衡侧向荷载的分布,提出了等效的抗剪模型。以二维有限元法对路堤的稳定性进行了分析,方法是使用等效抗弯力和等效抗剪力方法将柱子转换成等效土墙。结果发现,等效抗弯方法的结果更接近于三维分析的估计,这与GEC的弯曲破坏机理相吻合。建议增加一排这样的立柱,以在脚趾前的土壤中提供更高的侧向阻力,以改善路堤的稳定性。 (C)2015 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Geotextiles and Geomembranes》 |2015年第5期|424-431|共8页
  • 作者单位

    Tongji Univ, Sch Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Sch Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Sch Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China|Federat Univ Australia, GHERG, Melbourne, Vic 3842, Australia;

    Tongji Univ, Sch Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China|Wuhan Guangyi Transportat Sci & Technol Co Ltd, Wuhan 430074, 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

    Geosynthetic-encased stone column; Soft soil; Bending failure; Unbalanced lateral loading;

    机译:土工包裹石柱;软土;弯曲破坏;横向荷载不平衡;
  • 入库时间 2022-08-18 00:12:48

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