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首页> 外文期刊>Proceedings of the Institutuion Civil Engineers >Centrifuge model tests on soil-nailed slopes subjected to seepage
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Centrifuge model tests on soil-nailed slopes subjected to seepage

机译：渗流下土钉边坡的离心模型试验

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This paper presents the results of centrifuge model tests on the behaviour of a slope subjected to seepage with and without soil nails. For this purpose, a custom-designed seepage flow simulator was developed for evaluating the deformation behaviour of slopes with and without soil nails at the onset of seepage flow at 30g. A series of centrifuge model tests was carried out on 2V: IH slopes by varying nail layout and length of soil nails. Bored and grouted soil nails including nail heads were modelled using thin aluminium tubes covered with a thin layer of sand-coated adhesive. A soil nail inclination of 15° with the horizontal was adopted with two different layouts. All the models were thoroughly instrumented with displacement transducers for measuring settlements and using pore pressure transducers to capture the development of the phreatic surface within the slope during the centrifuge test. A digital image analysis technique was employed to arrive at displacement vectors of markers placed on the front elevation of the slope. The displacements were used to compare slopes with and without soil nails and to identify the occurrence of failure surfaces. The results indicate that stabilising the earth slope using soil nails has a significant effect in improving the stability and deformation behaviour of a slope subjected to seepage. For a soil nail layout, the stabilising effect was observed to diminish with a decrease in soil nail length and increasing vertical and horizontal spacing of the soil nails in the slope surface. Stability analysis of the slope models with and without soil nails was found to be in good agreement with physically observed centrifuge test results.
机译：本文介绍了离心模型试验的结果，该模型对有土钉和无土钉的渗流边坡进行了试验。为此，开发了定制设计的渗流模拟器，用于评估在30g渗流开始时有或没有土钉的边坡的变形行为。通过改变钉子的布局和土钉的长度，在2V：IH坡度上进行了一系列离心模型测试。使用覆盖有薄层砂膜粘合剂的铝细管对包括钉头在内的钻孔和灌浆的土壤钉进行建模。土钉与水平面的倾斜角度为15°，采用两种不同的布局。所有模型均配备了位移传感器，用于测量沉降，并使用孔隙压力传感器在离心机测试过程中捕获斜坡内潜水面的发育情况。使用数字图像分析技术来获得放置在斜坡前标高上的标记的位移矢量。位移用于比较有土钉和无土钉的边坡，并确定破坏面的发生。结果表明，用土钉稳定土坡对改善渗流坡面的稳定性和变形性能具有显著作用。对于土钉布局，观察到稳定作用随着土钉长度的减小和土钉在斜坡表面中的垂直和水平间距的增加而减小。发现有和没有土钉的边坡模型的稳定性分析与物理观察的离心测试结果非常吻合。

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