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首页> 外文期刊>Geotextiles and Geomembranes >Centrifuge and numerical model studies on the behaviour of geogrid reinforced soil walls with marginal backfills with and without geocomposite layers
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Centrifuge and numerical model studies on the behaviour of geogrid reinforced soil walls with marginal backfills with and without geocomposite layers

机译：带有和不带有土工复合材料层的带边际回填土工格栅加筋土墙性能的离心和数值模型研究

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The aim of this paper is to study the effect of geocomposite layers as internal drainage system on the behaviour of geogrid reinforced soil walls with marginal backfills using centrifuge and numerical modelling. A series of centrifuge model tests were carried out using a 4.5 m radius beam centrifuge facility available at HT Bombay. A seepage condition was imposed to all models to simulate rising ground water condition. Displacement and pore water pressure transducers were used to monitor the performance of all centrifuge models. A geogrid reinforced soil wall without any geocomposite layer experienced catastrophic failure soon after applying seepage due to the development of excess pore water pressure within the reinforced soil zone of the wall. In comparison, reinforced soil wall with two geocomposite layers at the bottom portion of the wall was found to have a good performance at the onset of seepage and by embedding four geocomposite layers up to the mid-height of the wall from bottom as a result of lowering phreatic surface much more effectively. For analysing further the observed behaviour of centrifuge model tests, stability and seepage analysis were conducted using SLOPE/W and SEEP/W software packages. A good agreement was found between the results of numerical analysis and observation made in centrifuge tests. The effect of number of geocomposite layers as well as its transmissivity was further analysed using parametric study. The results of parametric study revealed that the number of geocomposite layers plays a main role on the good performance of the geogrid reinforced soil walls with marginal backfill.
机译：本文的目的是通过离心和数值模拟研究土工复合材料层作为内部排水系统对边际回填土工格栅加筋土墙性能的影响。使用HT Bombay的4.5 m半径射束离心机进行了一系列离心机模型测试。对所有模型都施加了渗流条件，以模拟地下水上升的条件。位移和孔隙水压力传感器用于监测所有离心机模型的性能。没有土工复合材料层的土工格栅加筋土墙在施加渗水后不久就遭受了灾难性破坏，这是由于墙的加筋土区域内出现了多余的孔隙水压力所致。相比之下，发现在墙的底部具有两个土工复合材料层的加筋土墙在渗水开始时表现出良好的性能，并且通过将四个土工复合材料层埋入墙体中部，直到底部从墙的中间高度开始更有效地降低潜水面。为了进一步分析观察到的离心机模型测试行为，使用SLOPE / W和SEEP / W软件包进行了稳定性和渗流分析。数值分析的结果与离心测试的观察结果之间找到了很好的一致性。使用参数研究进一步分析了土工复合材料层数及其透射率的影响。参数研究的结果表明，土工复合材料层的数量对带有边际回填的土工格栅加筋土墙的良好性能起着主要作用。

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