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Nonlinear consolidation of vertical drains with coupled radial-vertical flow considering well resistance

机译:考虑井阻力的垂直排水耦合径向-垂直流的非线性固结

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摘要

The consolidation behavior of ground with vertical drains is known to be greatly affected by the finite permeability of the sand drains, also called the effect of well resistance. However, up to now, no analytical methods have been reported for evaluating this effect on the nonlinear consolidation behavior of vertical drains. In this paper, by considering the nonlinear compressibility and permeability of soil during consolidation, the effect of well resistance was incorporated into the derivation of the equations that govern the nonlinear consolidation of a vertical drain with coupled radial vertical flow. In addition, the smear effect was considered by assuming three decay patterns for the radial permeability coefficients of the soil toward the sand drain in the smeared zone. After obtaining the governing equations, a simplified analytical solution is derived for a general time-variable surcharge loading. Based on the general solution obtained, detailed solutions are provided for three special types of loading schemes: constant loading, single-stage loading, and multi-stage loading. The validity of the solution is verified by reducing it to several special cases and comparing these to existing solutions. Finally, the effect of the well resistance, the ratios of the compression index to the radial and vertical permeability indices, various loading schemes, and various variation patterns of the radial permeability coefficient of the soil in the smeared soil zone are investigated using parametric analysis. (C) 2014 Elsevier Ltd. All rights reserved.
机译:已知具有垂直排水沟的地面的固结特性会受到砂排水沟的有限渗透性的极大影响,这也称为井阻力效应。但是,到目前为止,还没有分析方法可以评估这种对竖向排水管非线性固结行为的影响。在本文中,通过考虑固结过程中土壤的非线性可压缩性和渗透性,将井阻力的影响纳入到控制垂直排水与径向垂直流耦合的非线性固结的方程式的推导中。另外,通过假定污泥向污泥区中排沙的径向渗透系数的三个衰减模式来考虑污泥效应。在获得控制方程后,针对一般随时间变化的附加负荷得出简化的解析解。根据获得的一般解决方案,为三种特殊类型的加载方案提供了详细的解决方案:恒定加载,单阶段加载和多阶段加载。通过将解决方案简化为几种特殊情况并将其与现有解决方案进行比较,可以验证该解决方案的有效性。最后,通过参数分析,研究了污点土壤中的井阻力,压缩指数与径向和垂直渗透指数的比率,各种加载方案以及径向渗透系数的各种变化模式的影响。 (C)2014 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Geotextiles and Geomembranes》 |2015年第2期|182-189|共8页
  • 作者单位

    China Univ Min & Technol, Sch Mech & Civil Engn, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Peoples R China|Univ Newcastle, Australia Res Council, Ctr Excellence Geotech Sci & Engn, Callaghan, NSW 2308, Australia;

    Univ Newcastle, Australia Res Council, Ctr Excellence Geotech Sci & Engn, Callaghan, NSW 2308, Australia;

    Univ Newcastle, Australia Res Council, Ctr Excellence Geotech Sci & Engn, Callaghan, NSW 2308, Australia;

    Univ Newcastle, Australia Res Council, Ctr Excellence Geotech Sci & Engn, Callaghan, NSW 2308, Australia;

    Zhejiang Univ, Res Ctr Coastal & Urban Geotech Engn, Hangzhou 310058, Zhejiang, 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

    Consolidation; Vertical drain; Nonlinearity; Well resistance; Coupled radial-vertical flow; Instantaneous loading; Single-stage loading; Multi-stage loading;

    机译:固结;垂直排水;非线性;井阻力;径向-垂直耦合流;瞬时荷载;单级荷载;多级荷载;
  • 入库时间 2022-08-18 00:12:46

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