Effect of initial stiffness on the induced horizontal displacements of geotechnical structures built on/in overconsolidated clays
Effect of initial stiffness on the induced horizontal displacements of geotechnical structures built on/in overconsolidated clays
This work intends to study the effect of the initial stiffness on the induced horizontal displacements of two ge- otechnical structures performed on/in overconsolidated clays: an embankment built on Boston blue clay and a tunnel dug in London clay. The numerical predictions are performed with the MIT-E3 model, which reproduces the small strain nonlinearity and hysteretic stress-strain response observed in unload-reload cycles. Firstly, the results of unload-reload cycle of two consoli- dation tests were used to validate the constitutive model. Afterwards, the horizontal displacements of the two geotechnical struc- tures predicted numerically for different initial stiffness (changing the k0 parameter of the Mit-E3 model) are compared with each other and with field data. The results show that a decrease in the initial stiffness induces an increase in the horizontal displacements. This effect is more significant during the construction of the embankment and immediately after the execution of the tunnel, that is, when the stress paths evolve within the yield surface and the behaviour is governed by a non-linear elastic law.
Luis Santos; Paulo Da Venda Oliveira; J. Almeida e Sousa; Luis Leal Lemos
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
7. Dams, embankments and slopes
https://doi.org/10.53243/NUMGE2023-432
Contact Information
- Secretary General - Dr A M McNamara
- Email: [email protected]
- Phone: +44 20 7040 8154
- City, University of London
- Northampton Square
- London EC1V 0HB. United Kingdom