Numerical modelling of reinforced fill over a void considering rate-dependent stiffness of the reinforcement

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-04-02 DOI:10.1016/j.geotexmem.2024.03.006

Fahimeh M. Naftchali , Richard J. Bathurst

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引用次数: 0

Abstract

The problem of a reinforced fill over a void has been the subject of much research in the geosynthetics literature. Previous studies have mainly focused on finding closed-form solutions to predict the tensile loads and strains in the reinforcement layer once a void develops below the fill. In this paper, a 2D finite difference (FLAC) model that implements the hyperbolic isochronous load-strain model for the reinforcement by Bathurst and Naftchali (2021) is used to investigate the influence of the rate-dependent properties of polymeric geosynthetic reinforcement materials on reinforcement tensile strains and load, and overall system performance including vertical deformation at the reinforcement elevation and at the fill surface. The paper also investigates the influence of fill soil properties and constitutive model type, foundation condition, void geometry and fill height on system performance. The results of numerical modelling are compared to predictions made using the closed-form solution of Giroud et al. (1990) and in the BSI 8006-1 (2010) design code. The results of numerical modelling demonstrate that the choice of fill height to void width and the stiffness of the rate-dependent geosynthetic reinforcement layer are important to ensure that the maximum reinforcement strain, allowable strength and fill surface settlement criteria are not exceeded.

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考虑到钢筋的刚度随速率变化，对空隙上的加固填料进行数值模拟

土工合成材料文献对空隙上的加固填料问题进行了大量研究。以往的研究主要集中在寻找封闭式解决方案，以预测填料下方出现空隙后加固层中的拉伸载荷和应变。本文使用了一个二维有限差分（FLAC）模型，该模型实现了 Bathurst 和 Naftchali（2021 年）提出的加固双曲等速荷载-应变模型，用于研究聚合物土工合成材料的速率相关特性对加固拉伸应变和荷载以及整个系统性能（包括加固高程和填土表面的垂直变形）的影响。论文还研究了填土特性和构成模型类型、地基条件、空隙几何形状和填土高度对系统性能的影响。数值建模结果与使用 Giroud 等人（1990 年）的闭合形式解决方案和 BSI 8006-1 (2010) 设计规范的预测结果进行了比较。数值建模结果表明，填土高度与空隙宽度的选择以及取决于速率的土工合成材料加固层的刚度对于确保不超过最大加固应变、允许强度和填土表面沉降标准非常重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.