Modeling the Onset of Shallow Landslides in Partially Saturated Slopes Subjected to Rain Infiltration
Modeling the Onset of Shallow Landslides in Partially Saturated Slopes Subjected to Rain Infiltration
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DOI：
10.1061/41165(397)171
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
J. Eichenberger;M. Nuth;L. Laloui
中科院分区：
文献类型：
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作者：
J. Eichenberger;M. Nuth;L. Laloui
强降雨可能导致边坡的浅层滑动，这些边坡通常最初处于部分水饱和状态。一个多物理场的方法和先进的本构模型是必要的，以考虑在部分饱和土壤中的物理关键过程，在降雨事件，如通过固体基质，土壤水分保持行为和基质吸力的力学行为的影响。采用弹塑性本构模型ACMEG-s，在有限元模型框架内，采用干湿滞后的弹塑性持水模型，对降雨入渗过程中陡坡的失稳、瞬态过程进行了分析。结果表明，在发生故障，湿孔塌陷和塑性剪切应变发生在下部的斜坡和向上发展的斜坡表面划定一个可能的故障机制。
Heavy rainfall can lead to shallow slips on slopes which are often initially in a state of partial water saturation. A multiphysics approach and advanced constitutive modeling are necessary to take into account the physical key processes in partially saturated soils during rainfall events, such as water flow through the solid matrix, soil water retention behavior and the effects of matric suction on the mechanical behavior. The elasto-plastic constitutive model ACMEG-s that includes an elasto-plastic water retention model with wetting-drying hysteresis is used in the framework of finite element modeling for the assessment of destabilizing, transient processes in a steep slope during rain infiltration. It is shown that at the onset of failure, wetting pore collapse and plastic shear strains occur in the lower part of the slope and develop upwards towards the slope surface to delimit a probable failure mechanism.