@proceedings {14605,
	title = {Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay},
	journal = {Pro eedings of the 9 th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE 2018)},
	year = {2018},
	pages = {1197-1202},
	address = {Porto},
	author = {Santana, T. and M. Vicente da Silva and A. Nunes Ant{\~a}o and Guerra, N. M. C.}
}
