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Bending Stiffness of Geosynthetic-reinforced Soil (GRS) Platform

机译：土工合成材料（GRS）平台的弯曲刚度

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摘要

Understanding the homogenous bending stiffness of geosynthetic reinforced soil (GRS) beams and platforms can aid inrnthe design of civil structures that span unstable or compressible soil and subsurface pipe conduits. Despite thernincreasing use of GRS, GRS beams and platforms bending behavior has received little attention. GRS beams andrnplatforms are typically composed of alternating layers of geosynthetic reinforcement and soil, resting on soft or unstablernsoil, and are competently supported on either end. This investigation evaluates composite or “homogenized” massrnbending stiffness resulting from the inclusion of geosynthetic reinforcement in GRS. Analyses are performed using therntwo dimensional FEM and the Winkler foundation model. The research consists of two primary analyses. The first was arnparametric study to ascertain the influential parameters contributing to the bending stiffness. The second investigatedrnthe effect of reinforcement spacing and the number of layers on the GRS stiffness. The research concludes that bendingrnresistance is best gained by decreasing the spacing between reinforcement layers and using higher strength soils.rnIncreasing reinforcement tensile strength also increases bending resistance, but the affect was ancillary to the spacingrnand soil stiffness. The GRS beams numerically modeled for this study exhibited similar displacement behavior to thernWinkler foundation model, indicating that the bending behavior of GRS beams can be analyzed using methods thatrnapply to fundamental concepts of beam bending theory.
机译：了解土工合成材料加筋土（GRS）梁和平台的均匀弯曲刚度可以帮助设计跨越不稳定或可压缩土壤和地下管道的土木结构。尽管越来越多地使用GRS，但是GRS梁和平台的弯曲行为却很少受到关注。 GRS梁和平台通常由土工合成材料增强层和土壤的交替层组成，分别位于软土或不稳定土层上，并在任一端均得到适当支撑。这项研究评估了GRS中包含土工合成材料增强材料所产生的复合或“均质”整体弯曲刚度。使用二维有限元法和Winkler基础模型进行分析。该研究包括两个主要分析。首先是进行参数研究，以确定影响弯曲刚度的影响参数。第二篇研究了钢筋间距和层数对GRS刚度的影响。研究得出的结论是，通过减小增强层之间的间距并使用较高强度的土壤可以最佳地获得抗弯强度。增加增强抗拉强度还可以提高抗弯强度，但其影响与间距和土壤刚度有关。数值模拟的GRS梁表现出与rn Winkler基础模型相似的位移行为，这表明可以使用适用于梁弯曲理论基本概念的方法来分析GRS梁的弯曲行为。

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  • 来源
    《Geosynthetics 2013》|2013年|302-311|共10页
  • 会议地点 Long Beach CA(US)
  • 作者

    Christopher M. Gemperline;

  • 作者单位

    P.E., U.S. Bureau of Reclamation, USA, cgemperline@usbr.gov;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
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