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A numerical study of the effect of soil-atmosphere interaction on the stability and serviceability of cut slopes in London clay

机译：土 - 气相互作用对伦敦粘土路堑边坡稳定性及适用性影响的数值研究

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The stability of cut slopes is greatly influenced by seasonal pore water pressure variations under the combined effect of rainfall and vegetation. However, predicting soil-atmosphere interaction is not straightforward, due to the complexity of both the boundary conditions involved and the hydro-mechanical behaviour of soils, which is coupled and highly nonlinear, rendering the use of numerical tools, such as finite element analysis, necessary. The paper discusses the numerical modelling of soil-atmosphere interaction and presents the analysis of a slope cut in London clay in a highly vegetated area. The whole life cycle of the slope is considered with phases of low and high water demand vegetation and vegetation clearance. The analysis results indicate that dense vegetation is associated with high factors of safety, but may induce large differential displacements which are likely to affect the serviceability of the slope. Vegetation clearance, however, may initiate instability, highlighting the need for effective vegetation management in order to achieve a balance between serviceability and ultimate limit states. Although the case considered is representative of South East England, it introduces the necessary tools for realistic numerical analysis of soil-atmosphere interaction.
机译：在降雨和植被共同作用下，季节性孔隙水压力的变化极大地影响了边坡的稳定性。但是，由于所涉及的边界条件和土壤的水力机械行为既复杂又高度非线性，因此预测土壤与大气之间的相互作用并不容易，这使得必须使用有限元分析等数字工具，必要。本文讨论了土壤-大气相互作用的数值模型，并对高植被度地区伦敦粘土的边坡开挖进行了分析。考虑到高低需水植被和植被清除的阶段，对斜坡的整个生命周期进行了考虑。分析结果表明，茂密的植被与较高的安全系数有关，但可能引起较大的差异位移，这很可能会影响斜坡的可使用性。然而，清除植被可能会引发不稳定性，突出了对有效植被管理的需求，以便在可使用性和最终极限状态之间取得平衡。尽管所考虑的案例是英格兰东南部的代表，但它为土壤-大气相互作用的逼真的数值分析引入了必要的工具。

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