Forecasting the long-term deterioration of a cut slope in high-plasticity clay using a numerical model
| Autor: | Anthony Blake, Ashraf El-Hamalawi, Stephanie Glendinning, Harry Postill, Mohamed Rouainia, Neil Dixon, Kevin Briggs, Peter Helm, J. Smethurst |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Effective stress
Lead (sea ice) 0211 other engineering and technologies Geology Strength reduction 02 engineering and technology Dissipation Plasticity 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Term (time) Factor of safety Pore water pressure Geotechnical engineering 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Postill, H, Helm, P, Dixon, N, Glendinning, S, Smethurst, J, Rouainia, M, Briggs, K, El-Hamalawi, A & Blake, A 2021, ' Forecasting the long-term deterioration of a cut slope in high-plasticity clay using a numerical model ', Engineering Geology, vol. 280, 105912 . https://doi.org/10.1016/j.enggeo.2020.105912 |
| Popis: | This paper details development of a numerical modelling approach that has been employed to forecast the long-term performance of a cut slope formed in high plasticity clay. It links hydrological and mechanical behaviour in a coupled saturated and unsaturated model. This is used to investigate the influence of combined dissipation of excavation-generated excess pore water pressures and seasonal weather-driven near-surface cyclic pore water pressures. Deterioration of slope performance is defined in terms of both slope deformations (i.e. service) and factor of safety against shear failure (i.e. safety). Uniquely, the modelling approach has been validated using 16 years of measured pore water pressure data from multiple locations in a London Clay cut slope. Slope deterioration was shown to be a function of both construction-induced pore water pressure dissipation and seasonal weather-driven pore water pressure cycles. These lead to both transient and permanent changes in factor of safety due to effective stress variation and mobilisation of post-peak strength reduction over time, respectively, ultimately causing shallow first-time progressive failure. It is demonstrated that this long-term (90 year) deterioration in slope performance is governed by the hydrological processes in the weathered near surface soil zone that forms following slope excavation. |
| Databáze: | OpenAIRE |
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