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首页> 外文期刊>Arabian Journal for Science and Engineering >Numerical Analysis on Stabilizing Mechanism of Soil Nails in Steep Fill Slopes Subjected to Rainfall Infiltration Using a Hypoplastic Model
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Numerical Analysis on Stabilizing Mechanism of Soil Nails in Steep Fill Slopes Subjected to Rainfall Infiltration Using a Hypoplastic Model

机译：陡坡降雨入渗对陡坡土钉稳定机理的数值模拟分析。

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摘要

Soil nailing has been widely used to stabilize slopes across the world over the last decades and is currently one of the predominant methods used for upgrading fill slopes in Hong Kong. The behavior of the soil nails in fill slopes has been investigated by experimental and numerical methods. However, the influence of rainfall infiltration on the reinforced fill slopes by soil nails was not investigated in existing studies. In addition, the stabilizing mechanism of the use of soil nails in fill slopes under rainfall condition is not yet understood thoroughly. The objectives of this study, therefore, are to explore the response of steep fill slopes to rainfall infiltration and the mechanism of soil nails in improving slope stability and reducing slope deformation. A series of two-dimensional numerical simulations where a hypoplastic constitutive model was used to model the strain-softening behavior of fill slopes was carried out. The numerical results show that a potential slide is developed in the unreinforced fill slope and thus slope failure may occur initiating from the toe of slope. Due to the presence of soil nails, both shallow failure and deep-seated failure are prevented in the soil nail reinforced slopes. The soil nails greatly limit the displacement of slope and the formation of potential slide in the slope. The tensile forces in the soil nails are mobilized through the effective interaction among soil nails, nail heads and surrounding soil when a potential slide is being initiated. The nail heads transfer the earth pressure of the overlying soil layer to the soil nails in question, causing the decrease of soil stress around the nail heads. The results also demonstrate that the interface friction between nail and soil can influence the stabilizing effect. Therefore, it is necessary to ensure sufficient interface friction to make the soil nails effective in transferring earth pressure and reducing slope deformation. However, once the friction coefficient between nail and soil reaches a threshold value, the interface friction will no longer be the key factor for the slope stability.
机译：在过去的几十年中，土钉被广泛用于稳定世界各地的斜坡，并且是目前香港用于升级填土斜坡的主要方法之一。通过实验和数值方法研究了土质钉在填充坡中的行为。然而，现有研究尚未研究降雨入渗对土钉对加筋填土边坡的影响。此外，在降雨条件下在填土坡中使用土钉的稳定机理尚未完全了解。因此，本研究的目的是探索陡坡填土边坡对降雨入渗的响应以及土钉在改善边坡稳定性和减少边坡变形方面的作用机理。进行了一系列二维数值模拟，其中使用了一个非塑性本构模型来模拟填土边坡的应变软化行为。数值结果表明，在未加筋的填土边坡中会形成潜在的滑动，因此可能会从边坡的趾部开始发生边坡破坏。由于存在土钉，在土钉加固的斜坡中既可以防止浅层破坏，也可以防止深层破坏。土钉极大地限制了边坡的位移以及边坡中潜在滑动的形成。当潜在的滑动开始时，土钉，钉头和周围土壤之间的有效相互作用会调动土钉中的拉力。钉头将上面的土壤层的土压力传递到所讨论的土钉上，从而导致钉头周围的土壤压力降低。结果还表明，钉子与土壤之间的界面摩擦会影响稳定效果。因此，有必要确保足够的界面摩擦力以使土钉有效地传递土压力并减小斜坡变形。但是，一旦钉子与土壤之间的摩擦系数达到阈值，界面摩擦将不再是斜坡稳定性的关键因素。

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  • 来源
    《Arabian Journal for Science and Engineering》 |2018年第10期|5079-5090|共12页
  • 作者

    Deng Gang; Xu Tao; Chen Rui; Lu Zhao; Liu Jian;

  • 作者单位

    China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China;

    Univ Ghent, Lab Geotech, B-9052 Zwijnaarde, Belgium;

    Harbin Inst Technol, Dept Civil & Environm Engn, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China;

    Harbin Inst Technol, Dept Civil & Environm Engn, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China;

    Hohai Univ, Geotech Res Inst, Nanjing 210098, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Soil nail; Rainfall infiltration; Slope stability; Decomposed granite; Hypoplastic model;

    机译：土钉;降雨入渗;边坡稳定性;花岗岩分解;增塑模型;

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