Numerical study of the effect of soil–atmosphere interaction on the stability and serviceability of cut slopes in London clay
- 1 March 2017
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Geotechnical Journal
- Vol. 54 (3), 405-418
- https://doi.org/10.1139/cgj-2016-0319
Abstract
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 hydromechanical behaviour of soils, which is coupled and highly nonlinear, rendering the use of numerical tools, such as finite element analysis, necessary. This 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 to achieve a balance between serviceability and ultimate limit states. Although the case considered is representative of southeast England, it introduces the necessary tools for realistic numerical analysis of soil-atmosphere interaction.Keywords
This publication has 19 references indexed in Scilit:
- Study of desiccation crack initiation and development at ground surfaceEngineering Geology, 2011
- Numerical modelling of climate effects on slope stabilityEngineering Sustainability, 2009
- A precipitation boundary condition for finite element analysisPublished by Taylor & Francis Ltd ,2008
- Undrained behaviour of brecciated Upper Lias Clay at Empingham DamGéotechnique, 2007
- Effects of near-surface environmental conditions on instability of an unsaturated soil slopeCanadian Geotechnical Journal, 2004
- Assessing the contribution of vegetation to slope stabilityGeotechnical Engineering, 2004
- Three-dimensional numerical investigations of groundwater responses in an unsaturated slope subjected to various rainfall patternsCanadian Geotechnical Journal, 2001
- Assumption, prediction and reality in geotechnical engineeringGéotechnique, 1994
- Effect of soil suction on slope stability at Notch HillCanadian Geotechnical Journal, 1989
- SOIL STRUCTURE IN RELATION TO SOIL SUCTION (pF)European Journal of Soil Science, 1954