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Modelling of geosynthetic-reinforced column-supported embankments using 2D full-width model and modified unit cell approach

机译：使用2D全宽模型和改进的单元格方法对土工合成材料加筋柱支撑路堤进行建模

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摘要

Soil-cement deep mixing (DM) columns combined with geosynthetic basal reinforcement are an accepted technique in geotechnical engineering to construct road and railway embankments over soft foundations. Both full-width and unit cell models have been used to numerically simulate the performance of geosynthetic-reinforced and column-supported (GRCS) embankments. However, the typical unit cell model with horizontally fixed side boundaries cannot simulate the lateral spreading of the embankment fill and foundation soil. As a result, the calculated reinforcement tensile loads using typical unit cell models are much less than those from matching full-width models. The paper first examines GRCS embankments using a full-width model with small- and large-strain modes in FLAC and then compares the calculated results from the full-width model with those using a typical unit cell model, a recently proposed modified unit cell model, and a closed-form solution. The paper also examines the influence, of the soft foundation soil modulus, reinforcement tensile stiffness, and DM column modulus on the reinforcement tensile loads. Numerical analyses show that the reinforcement tensile loads from the modified unit cell model are in good agreement with those from the full-width model for zones under the embankment crest for all cases and conditions examined in the paper. Both the full-width model and modified unit cell model perform better than the typical unit cell model for the prediction of the reinforcement tensile load when compared to the closed-form solution. However, while the modified unit cell developed by the writers is shown to be more accurate than the typical unit cell when predictions are compared to results using full-width numerical simulations, the benefit of using this approach to reduce computation times may be limited in practice. (C) 2017 Elsevier Ltd. All rights reserved.
机译：水泥土深层搅拌（DM）柱与土工合成基础加固相结合是岩土工程中公认的在软基础上建造公路和铁路路堤的技术。全宽模型和晶胞模型均已用于数值模拟土工合成纤维增强和柱支撑（GRCS）路堤的性能。但是，具有水平固定的侧边界的典型单位单元模型不能模拟路堤填土和基础土的横向扩展。结果，使用典型的单元模型计算出的钢筋拉伸载荷远小于匹配的全宽模型。本文首先在FLAC中使用具有小应变模式和大应变模式的全宽模型检查GRCS路堤，然后将全宽模型的计算结果与使用典型的单元格模型（最近提出的改进的单元格模型）的结果进行比较。 ，以及封闭式解决方案。本文还研究了软土地基模量，配筋拉伸刚度和DM柱模量对配筋拉伸载荷的影响。数值分析表明，在本文研究的所有情况和条件下，修正后的单元格模型的加固拉伸荷载与路堤顶下区域全宽模型的加固拉伸荷载均吻合。与封闭形式的解决方案相比，全宽模型和修改后的晶胞模型在预测钢筋拉伸载荷方面均优于典型的晶胞模型。但是，虽然在将预测与使用全角数值模拟的结果进行比较时，显示了由作者开发的修改后的晶胞比典型晶胞更准确，但在实践中使用此方法减少计算时间的好处可能受到限制。 （C）2017 Elsevier Ltd.保留所有权利。

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